Class / Patent application number | Description | Number of patent applications / Date published |
327074000 | Input signal compared to plural fixed references | 33 |
20080197889 | Semiconductor Integrated Circuit Device and Mobile Device Using Same - An IC includes an internal circuit that switches between on-state and off-state in response to an external signal and also includes an oscillator circuit that is externally synchronized. The IC further includes a state holding circuit that, when pulses for synchronizing the oscillator circuit are inputted to a standby pulse input terminal, applies, to the internal and the oscillator circuits, as an operation signal, a voltage obtained by rectifying pulses outputted from a comparator, and, when a constant voltage for non-operation is applied to the standby pulse input terminal for a given time period, applies, to the internal and oscillator circuits, as a non-operation signal, a constant voltage outputted from the comparator. | 08-21-2008 |
20090153197 | METHOD OF TRANSMITTING AUDIO AND VIDEO SIGNALS USING ONE CONNECTOR AND ELECTRONIC DEVICE USING SAME - An electronic device includes a connector, at least two kinds of signal transmitting circuits, and a selecting system. The connector is capable of transmitting audio and video signals when connected to a peripheral device. The selecting system includes a detecting module, a memory module, a comparing module, and a connecting module. The detecting module is capable of detecting and measuring the voltage of a signal line of the connector. The memory module is capable of storing predetermined voltage ranges corresponding to different kinds of peripheral devices. The comparing module is capable of comparing the voltage of the signal line measured by the detecting module to the predetermined voltage ranges and determining what kind of peripheral device is connected to the connector. The connecting module is capable of connecting the connector to one of the signal transmitting circuits according to the comparing module. | 06-18-2009 |
20090267652 | METHODS AND CIRCUITS FOR TRIODE REGION DETECTION - The present invention relates to circuits and methods for detecting transistor operation in the triode region including a circuit for a transistor in a constant current source. The circuit comprises a detector having a first input, a second input, and an output. The first input of the detector is coupled to the source of the transistor and the second input of the detector is coupled to the set point terminal of the constant current source. The circuit also comprises a flag coupled to the detector output. The detector has parameters selected so that, when the voltage at the source of the transistor satisfies a reference condition, the output of the detector sets the flag. The reference condition is established relative to the voltage at the set point terminal of the constant current source and relative to the triode transition voltage of the transistor at a selected drain-source current. | 10-29-2009 |
20090289665 | Comparator - An electronic device compares a first voltage with a selected first reference voltage or second reference voltage. The electronic device includes a comparator having a first input receiving the first voltage, a second input receiving the selected reference voltage and an output providing an output signal based on a comparison. A control stage connected to the output of the comparator generates a control signal based on the output of the comparator. The electronic device selects either the first reference voltage or the second reference voltage in response to the control signal thus comparing the first voltage with the selected reference voltage. | 11-26-2009 |
20100117685 | Method and System for Detecting and Identifying Electronic Accessories or Peripherals - Aspects of a method and system for detecting and identifying electronic accessories or peripherals utilizing a hardware audio CODEC are provided. In this regard, a hardware audio CODEC may be operable to compare one or more voltages on one or more biased pins of an accessory or peripheral port to one or more reference voltages and generate one or more digital representations of the one or more voltages on the biased one or more pins. An accessory or peripheral attached to the accessory or peripheral port may be identified based on the comparison and/or the generated one or more digital representations. The one or more bias voltages may be controlled based on a result of the comparison and/or the generated digital representations. The one or more bias voltages may be reduced after an attached accessory or peripheral has been identified. | 05-13-2010 |
20110018587 | METHOD AND CIRCUIT FOR CONFIGURING PIN STATES - The present disclosure relates to an electronic technology and discloses a method and circuit for configuring pin states. The method for configuring pin states includes: establishing a connection between a pin and a variable resistor; loading a fixed voltage on the pin, and detecting intensity of currents generated by the variable resistor under different resistance; comparing the detected current intensity with at least two different reference values, and outputting corresponding pin states according to the comparison results; or loading a fixed current on the pin, and detecting voltages generated by the variable resistor under different resistance; comparing the detected voltages with at least two different reference values, and outputting corresponding pin states according to the comparison results. With the present disclosure, multiple pin states may be easily obtained. | 01-27-2011 |
20110102022 | Input unit of portable terminal, portable terminal using the same, and operation method thereof - A portable terminal includes: a key row including a reference resistor, switches separately connected to the reference resistor, and a plurality of resistors connected to the switches, respectively; a reference voltage unit connected to the reference resistor and providing a reference voltage; and a first comparator and a second comparator dividing the reference voltage from the reference voltage unit by the reference resistor and at least one resistor connected to an activated switch, and receiving an analog key input signal corresponding to the divided reference voltage. | 05-05-2011 |
20110115526 | Microcomputer, Hysteresis comparator circuit, and voltage monitoring apparatus - A microcomputer includes a first comparator which compares a voltage to be monitored, with a first reference voltage, a second comparator which compares the voltage to be compared, with a second reference voltage, and an interrupt control circuit which monitors the voltage to be monitored by the first and second comparators in parallel and, when a preset condition is satisfied, generates an interrupt signal. | 05-19-2011 |
20110169530 | CIRCUIT FOR CLASSIFYING SIGNALS - A circuit for classification of analog input signals, comprising an analog memory component, such as a floating gate, used to store a threshold value; a threshold detection module used to determine whether the analog input signal exceeds the threshold value; a time delay module used to delay a processing of the analog signal; a time-amplitude window calculation module used to determine whether an amplitude of the analog input signal is between a lower limit and an upper limit of an amplitude window; and an output module indicating whether the amplitude of the analog signal is between the lower and the upper limit, wherein the indication is used to determine whether the analog input signal belongs to one of a plurality of analog signal classes. The classification is implemented in the analog domain, eliminating the need for sampling and digitizing the analog signal, consequently minimizing circuit area and power. | 07-14-2011 |
20110199125 | VOLTAGE COMPARATOR, LIQUID CRYSTAL DISPLAY DRIVER HAVING THE SAME AND TRANSITION ACCELERATION METHOD THEREOF - A voltage comparator includes an input portion, an output portion, and a diverting portion. The input portion accepts a first voltage and a second voltage and then outputs a first current based on the first voltage and outputs a second current based on the second voltage. The output portion outputs a result signal based on a difference between the first current and the second current. The diverting portion is electrically connected to the input portion and diverts a portion of the higher current amongst the first current and the second current. | 08-18-2011 |
20110204925 | Circuitry and Method for Monitoring a Supply Voltage - Embodiments related to comparing of a supply voltage are described and depicted. | 08-25-2011 |
20110291704 | Input Pin State Detection Circuit and Method Therefor - A state-detection circuit facilitates the detection of the state of an input pin relative to several different types of input circuits. According to an example embodiment, a state-detection circuit includes a plurality of comparators and circuit components, configured to provide a plurality of binary output signals that collectively indicate a state of an input pin to which the comparators are coupled. The state-detection circuit is configured to facilitate the detection of several different types of input circuits, based upon the binary output signals. | 12-01-2011 |
20120126856 | Adjustable Voltage Comparing Circuit and Adjustable Voltage Examining Device - In an adjustable voltage examining module, while a logic tester issues an input signal to an audio module under test, upper/low-threshold reference signals are simultaneously issued to an adjustable voltage comparing circuit. While the adjustable voltage comparing circuit receives a signal under test returned by the to-be-examined audio module after a while, the adjustable voltage comparing circuit loads both an high-threshold reference voltage and a low-threshold reference voltage respectively indicated by the reference upper/low-threshold signal so as to compare both the upper and low-threshold reference voltages with the signal under test. Therefore, while the signal under test is examined to acquire a voltage level between voltage levels of the upper and low-threshold reference signals, precise operations of the audio module under test are assured, and time wasted by continuously-issued interrupt is saved. | 05-24-2012 |
20130027088 | MULTILEVEL SLICER - A circuit design configured to process a differential input signal is provided. A first floating capacitor ladder is configured to receive the positive of the differential input signal and is connected to a first switched capacitor network through phase one controlled switches. A second floating capacitor ladder configured to receive the negative of the differential input signal and is connected to a second switched capacitor network through other phase one controlled switches. A reference resistor ladder is connected to the first switched capacitor network through phase two controlled switches to provide voltage references and connected to the second switched capacitor network through other phase two controlled switches to provide the voltage references. Response to controlling the switches, the first floating capacitor ladder is configured to output first voltage thresholds to a comparator array and the second floating capacitor ladder is configured to output second voltage thresholds to the comparator array. | 01-31-2013 |
20130063182 | Small Highly Accurate Battery Temperature Monitoring Circuit - A battery temperature monitoring circuit, which has a cold comparator and a hot comparator, achieves high accuracy in a small cell size by utilizing a cold current optimized for the cold comparator and a cold reference voltage, and a hot current optimized for the hot comparator and a hot reference voltage, along with switching circuitry that provides the cold current to the cold comparator as the battery temperature approaches the cold trip temperature, and the hot current to the hot comparator as the battery temperature approaches the hot trip temperature. | 03-14-2013 |
20130181745 | DIGITAL INPUT WITH VARIABLE IMPEDANCE - A device for sensing a binary signal includes a device configured to measure a signal level of the signal, a device configured to determine whether the measured signal level is “low” or “high”, a device configured to provide a variable input impedance, and a device configured to control the input impedance in response to the measured signal level. The variable input impedance may be provided by way of a transistor and a resistor, and by controlling the duty ratio of the transistor using pulse width modulation. Preferably, the input impedance is controlled to be low for low signal levels and to be high for high signal levels, which results in a more reliable sensing of binary signals. The device may be used for detecting the state of contact transducers suffering from parasitic resistances caused by moist and/or polluted environments. Further, a method of sensing a binary signal is provided. | 07-18-2013 |
20130300459 | KEY PRESS DETECTING CIRCUIT AND METHOD FOR DETECTING THE STATUS OF MULTIPLE KEYS THROUGH A SINGLE PIN - A key press detecting circuit and method detect the status of multiple keys through a single pin. In an embodiment, a constant current is provided to apply to a key module through a single pin, to generate a voltage at the single pin that is related to the equivalent resistance of the key module observed from the single pin, and the voltage of the single pin is compared with a set of reference values to identify the status of the plurality of keys. In another embodiment, a variable current is provided to apply to a key module through a single pin in such a way that the variable current is adjusted to maintain a constant voltage at the single pin, and the variable current is compared with a set of reference values to identify the status of the plurality of keys. | 11-14-2013 |
20140062534 | INTEGRATED CIRCUIT - An integrated circuit includes a plurality of semiconductor devices. Each of the semiconductor devices includes an internal voltage generation unit configured to generate a plurality of internal voltages, a voltage select output unit configured to output a default voltage of a plurality of internal voltages to a preset pad in response to an initial value of a select code, and selectively output the other voltages of the plurality of internal voltages to the pad in response to variations of the select code, and a stack operation control unit configured to control the voltage select output unit to output the default voltage to the pad in response to a stack signal and a predetermined value of the select code, instead of the initial value of the select code, and whether or not to activate the stack signal is determined according to whether or not the plurality of semiconductor devices are stacked. | 03-06-2014 |
20140070850 | CIRCUITS AND METHODS FOR FIELD-BASED COMMUNICATION - Several circuits and methods for field-based communication are provided. In an embodiment, a field-based communication circuit includes a receiver circuit, a detection circuit and a control circuit. The receiver circuit is configured to receive a field input signal from a field source. The detection circuit includes a voltage detection circuit and a current detection circuit configured to detect a voltage signal and a current signal, respectively associated with the field input signal. The control circuit is configured to trigger a selection of one of the voltage detection circuit and the current detection circuit based on a detection of a signal magnitude of one of the voltage signal and the current signal relative to at least a first predetermined threshold level, wherein the selection of one of the voltage detection circuit and the current detection circuit facilitates a demodulation of one of the voltage signal and the current signal. | 03-13-2014 |
20140266311 | SAMPLED REFERENCE SUPPLY VOLTAGE SUPERVISOR - A power supervisor circuit is provided. The circuit includes a first sample circuit that periodically samples a first reference voltage derived from a high output rail of a voltage source and generates a first sampled output voltage. The circuit includes second sample circuit that periodically samples a second reference voltage associated with a low output rail of the voltage source and generates a second sampled output voltage. A voltage supervisor in the circuit generates a trip point signal when a combination of the first and second sampled output voltage crosses a predetermined threshold indicating that the voltage source output voltage has fallen below a desired output voltage. | 09-18-2014 |
20140266312 | Sensing Circuit with Reduced Bias Clamp - A sensing circuit having a reduced bias clamp and method of operating the sensing circuit are provided. The sensing circuit may include a reference path and a sensing path. The sensing path may include a first transistor, clamping capacitor and a pair of switches. The reference path may include a second transistor, clamping capacitor and another pair of switches. A common gain stage receiving a bias voltage charges the clamping capacitors for the respective paths in a charging mode. The clamping capacitors may be charged in a serial or partially parallel manner during the charging mode. Each path may be coupled to a comparator, which may sense current or voltage changes between the paths during a sense mode. The sensing circuit may be configured to provide for sensing current or voltage changes between multiple sensing and/or reference paths in a parallel or serial manner. | 09-18-2014 |
20140340123 | KEY PRESS DETECTING CIRCUIT AND METHOD FOR DETECTING THE STATUS OF MULTIPLE KEYS THROUGH A SINGLE PIN - A key press detecting circuit and method detect the status of multiple keys through a single pin. In an embodiment, a constant current is provided to apply to a key module through a single pin, to generate a voltage at the single pin that is related to the equivalent resistance of the key module observed from the single pin, and the voltage of the single pin is compared with a set of reference values to identify the status of the plurality of keys. In another embodiment, a variable current is provided to apply to a key module through a single pin in such a way that the variable current is adjusted to maintain a constant voltage at the single pin, and the variable current is compared with a set of reference values to identify the status of the plurality of keys. | 11-20-2014 |
20160072494 | Sensing Circuit with Reduced Bias Clamp - A sensing circuit having a reduced bias clamp and method of operating the sensing circuit are provided. The sensing circuit may include a reference path and a sensing path. The sensing path may include a first transistor, clamping capacitor and a pair of switches. The reference path may include a second transistor, clamping capacitor and another pair of switches. A common gain stage receiving a bias voltage charges the clamping capacitors for the respective paths in a charging mode. The clamping capacitors may be charged in a serial or partially parallel manner during the charging mode. Each path may be coupled to a comparator, which may sense current or voltage changes between the paths during a sense mode. The sensing circuit may be configured to provide for sensing current or voltage changes between multiple sensing and/or reference paths in a parallel or serial manner. | 03-10-2016 |
327075000 | Three or more | 1 |
20120212258 | TRIAC Dimmer Detection - Methods, circuits, and systems for determining the presence of a chopped input signal are disclosed. A digital signal generator can produce multiple digital signals when an alternating current (AC) signal input reaches multiple threshold voltages. The times at which the threshold voltages are reached can be determined by looking at the times at which the digital signals go high and low. The differences between the times at which the digital signals go high and low are used to determine if the AC signal input is a leading or trailing edge chopped signal. The AC input signal is a leading edge chopped signal when the difference between the times at which the digital signals go high is less than a predetermined time threshold, and is a trailing edge chopped signal when the difference between the times at which the digital signals go low is less than a predetermined time threshold. | 08-23-2012 |
327076000 | With logic or bistable circuit | 9 |
20090039922 | Multi-level comparator for fix power consumption - A multi-level comparator with fixed power consumption is disclosed. By using the switch character of differential pair and parallelizing single side of common source amplifier with multi-level input, the power of the multi-level comparator can be fixed by the current bias. This result shows that the multi-level comparator is able to heighten input stages at fixed power. Therefore, the multi-level comparator has the functionalities of several different comparators while maintaining fixed power consumption. | 02-12-2009 |
20120153992 | Analog power sequencer and method - Supply voltage sequencing circuitry includes a first sequencer ( | 06-21-2012 |
20120262203 | Power supply input voltage detection circuit - The present invention discloses a power supply input voltage detection circuit. The power supply converts an input voltage to an output voltage by a transformer which includes a primary winding and a secondary winding. The primary winding is coupled to a power switch, which receives a switching signal to adjust the output voltage. The power switch is coupled to a sensing circuit; when the power switch turns ON, the sensing circuit generates a current sense signal according to current through the primary winding. The input voltage detection circuit includes: a rising time detection circuit, which detects a period, of time during which the current sense signal rises from a low reference level to a high reference level to generate a timing signal; and a determination circuit, which generates a determination signal according to the timing signal for determining whether the input signal is a high voltage or a low voltage. | 10-18-2012 |
20120280721 | SQUELCH DETECTION CIRCUIT - A squelch detection circuit for high-speed serial communication includes: an input level shifter configured to receive signals inputted through signal lines and shift the received signals to a predetermined potential level; a comparator configured to receive signals outputted from the input level shifter, and compares the received signals to determine whether data signals are noise or signal components; and a reset signal generator configured to receive the signals outputted from the input level shifter, convert the received signals into a single signal, and then generate a reset signal for an elastic buffer. The squelch detection circuit may detect a squelch state and provide a reset value for an elastic buffer in a USB 2.0 interface, and may reduce power consumption as much as possible in a suspend mode. | 11-08-2012 |
20120319736 | Comparator and method with adjustable speed and power consumption - A comparator ( | 12-20-2012 |
20130207692 | SEMICONDUCTOR INTEGRATED CIRCUIT - According to one embodiment, a semiconductor integrated circuit includes a semiconductor integrated circuit a voltage regulator providing a prescribed power-supply voltage, a plurality of delay test circuits, each of the delay test circuits being configured in each of areas where electrical current flows in response to each of operation modes, a test control unit executing a delay test using the delay test circuit under a test mode while decreasing a power-supply voltage in a stepwise fashion, a supply voltage decision unit deciding the power-supply voltage of the operation mode on a basis of the delay test, a memory unit storing the power-supply voltage of each operation mode, a supply voltage configuration unit reading out the power-supply voltage corresponding to the operation mode from the memory unit, and the supply configuration unit arranging the power-supply voltage as an output voltage of the voltage regulator when each of the operation modes starts to execute. | 08-15-2013 |
20140333347 | COMPARATOR - A comparator includes a first comparison unit configured to compare an input signal with a first signal and a second comparison unit configured to compare the input signal with a second signal having a voltage value lower than a voltage value of the first signal in a case where a voltage value of the input signal is lower than the voltage value of the first signal and compare the input signal with a third signal having a voltage value higher than a voltage value of the first signal in a case where a voltage value of the input signal is higher than the voltage value of the first signal. | 11-13-2014 |
20150022240 | POWER SUPPLY VOLTAGE TRANSITION COMPARISON CIRCUIT, POWER SUPPLY VOLTAGE TRANSITION COMPARISON METHOD, AND SEMICONDUCTOR INTEGRATED CIRCUIT - The power supply voltage transition comparison circuit includes a comparator evaluation voltage setting circuit, a comparator, a voltage evaluation circuit, and an evaluation voltage setting value output circuit. The comparator evaluation voltage setting circuit generates a divided voltage of one of a power supply voltage and a reference voltage. The comparator compares the other of the power supply voltage and the reference voltage with the divided voltage. The voltage evaluation circuit evaluates the power supply voltage based on a result of a comparison between the other voltage and the divided voltage. The evaluation voltage setting value output circuit changes a ratio between the one voltage and the divided voltage based on a result of an evaluation of the power supply voltage. | 01-22-2015 |
20150022241 | SENSOR DEVICE - Provided is a sensor device capable of removing the influence of each offset voltage of a sensor element, a differential amplifier, and an amplifier of the sensor device, to thereby detect a physical quantity with high precision. The sensor device includes: a switch circuit, which is connected to a first terminal pair and a second terminal pair of the sensor element, for controlling switching of the terminal pairs and outputting detection voltages; a differential amplifier, which includes a first input terminal and a second input terminal connected to a first output terminal and a second output terminal of the switch circuit, respectively, for outputting a result obtained by amplifying a difference of the detection voltages; an amplifier including at least two differential input pairs, one of which inputs the differential signal output from the differential amplifier, and at least one of which inputs a reference signal corresponding to a physical quantity to be detected; and a detection voltage setting circuit for outputting the reference signal to the amplifier. | 01-22-2015 |