| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 341142000 | Converter is part of control loop | 10 |
| 20090115652 | Digital Processor - An object of the present invention is to reduce spurious generation due to a malfunction of an A/D converter in a device performing digital processing by converting an analog signal high in cyclic characteristics to a digital signal with the A/D converter. | 05-07-2009 |
| 20090121908 | Source-Measure Unit Based on Digital Control Loop - A source-measure unit (SMU) may be implemented with a control loop configured in the digital domain. The output voltage and output current may be measured with dedicated ADCs (analog-to-digital converters). The readings obtained by the ADCs may be compared to a setpoint, which may be set in an FPGA (field programmable gate array) or DSP (digital signal processing) chip. The FPGA or DSP chip may then be used to produce an output to drive a DAC (digital-to-analog converter) until the output voltage and/or output current reach the respective desired levels. The readback values may be obtained by averaging the voltage and/or current readings provided by the ADCs. The averaging may be weighted to improve noise rejection. The digital control loop provides added flexibility to the SMU and a decrease in the accuracy requirements on the DAC, while also for solving potential range-switching issues that may arise within the SMU. | 05-14-2009 |
| 20090212983 | INTEGRATED CIRCUIT DEVICE AND ELECTRONIC INSTRUMENT - An integrated circuit device includes an amplifier circuit that includes first to Nth amplifiers, an A/D converter, first to Nth offset adjustment registers that are provided corresponding to the first to Nth amplifiers and store first to Nth offset adjustment data, first to Nth D/A converters provided corresponding to the first to Nth amplifiers, first to Nth offset value storage sections that store first to Nth offset value data, and a control circuit that calculates the first to Nth offset adjustment data based on the first to Nth offset value data, and sets the first to Nth offset adjustment data in the first to Nth offset adjustment registers. | 08-27-2009 |
| 20090212984 | QUANTIZING CIRCUITS WITH VARIABLE PARAMETERS - Systems, methods, and devices for obtaining data from a data location. The method may include generating a first value by sensing a data location under a first condition and generating a second value by sensing the data location under a second condition. The method may further include combining the first value with the second value to identify data conveyed by the data location. | 08-27-2009 |
| 20100079322 | High noise environment measurement technique - An electronic measurement system for extracting a small AC signal from a dominant DC background signal, which can be changing at a rate similar to that at which the desired signal changes. The invention is particularly useful for pulse rate measurement of a subject even while undergoing vigorous motion such as running, by means of pulse oximetry. The measurement technique utilizes a moving window for selecting a part of the input signal, and processing in an A/D converter, an offset part of the signal which falls within a range which covers the window. The method is also more generally employable to any measurement task, where the signal to be extracted is a small AC signal buried within a dominant DC or quasi-DC background, which itself can be changing, and even at a rate similar to that expected of the sought-after AC signal. | 04-01-2010 |
| 20100079323 | Switching converters controlled via sigma delta modulation - Low-cost switching converter systems are provided which combine analog generation of a current signal with digital generation of a loop error signal that is realized with a control loop that includes a high-resolution, low-bandwidth sigma-delta modulator and a low-resolution digital-to-analog converter. The current signal and error signal are differenced to provide a control signal to the switching converter. This economical system structure facilitates quick and easy digital alteration of system parameters (e.g., loop compensation and voltage reference). System embodiments add a high-frequency analog feedback path in parallel with the control loop to supplement and enhance its control performance. | 04-01-2010 |
| 20100097254 | MIXED-SIGNAL CONTROL APPARATUS OF MODULATION SYSTEM - A mixed-signal control apparatus of a modulation system is provided. The mixed-signal control apparatus includes a digital-to-analog converter (DAC) unit, an analog-to-digital converter (ADC) unit, and a processing unit. When a quantization step of the ADC unit is q | 04-22-2010 |
| 20100182179 | PIPELINED ANALOG-TO-DIGITAL CONVERTER - A pipelined analog-to-digital converter includes at least one multiplying digital-to-analog converter and at least one sub-ADC. The multiplying digital-to-analog converter includes at least one first capacitor, at least one second capacitor, an amplifier, and a plurality of switches. The amplifier is coupled to the first and the second capacitors. The switches control a connection between the first and the second capacitors according to a first control signal, a second control signal and a digital signal. In a first period, the first capacitor is connected to the second capacitor in parallel. In a second period, the first capacitor is connected to the second capacitor in series. At least one switch among the switches is composed of a transistor. The sub-ADC provides a digital signal according to the first and second control signals. | 07-22-2010 |
| 20110122008 | HIGH RESOLUTION OVERLAPPING BIT SEGMENTED DAC - A controller receives an M-bit input and generates, in response, an S-bit upper range binary data feeding S-bit high range DAC and an R-bit lower range data feeding an R-bit low range DAC. The controller detects transition points in the M-bit input and in response, adds a transition data to the S-bit data equal to at least one least significant bit of the S-bit data and subtracts a value from the R-bit data equal to the transition data. The transition points and the transition data are detected and added at points avoiding such transitions at a full scale value of the R-bit data. | 05-26-2011 |
| 20140055293 | DIGITAL-TO-ANALOG CONVERTER TO PRODUCE PAIRED CONTROL SIGNALS IN A POWER SUPPLY CONTROLLER - An controller for use in a power supply includes a variable oscillator and a digital-to-analog converter (DAC). The variable oscillator generates a switching signal to control a first switch of the power supply to regulate an output current of the power supply. The variable oscillator sets a duration of an on-time of the switching signal to be inversely proportional to a magnitude of a first analog signal. The variable oscillator also sets a switching period of the switching signal to be inversely proportional to a magnitude of a second analog signal. The digital-to-analog converter (DAC) converts binary digits into the first and second analog signals, such that a sum of the magnitude of the first analog signal and the magnitude of the second analog signal is a fixed value. | 02-27-2014 |
