| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 329347000 | AMPLITUDE MODULATION DEMODULATOR | 31 |
| 20080197919 | FULLY DIFFERENTIAL DEMODULATOR WITH VARIABLE GAIN, AND METHOD FOR DEMODULATING A SIGNAL - A demodulator includes input terminals, for receiving an input signal, and an amplifier stage having a gain. The input signal is amplitude-modulated and is defined by a carrier signal at a carrier frequency and by a modulating signal. The demodulator includes, moreover, a gain-control stage, coupled to the amplifier stage for varying the gain of the amplifier stage according to a sinusoid of a frequency equal to the carrier frequency, on the basis of the carrier signal. | 08-21-2008 |
| 20080224766 | DEMODULATION CIRCUIT - A modulation ratio enhancement circuit increases the modulation ratio of a current signal which is ASK-modulated with signal data. A branch unit, an average value detection unit, a comparator and a buffer constitute a demodulation unit so that the signal data is demodulated from a current signal of which the modulation ratio is increased by the modulation ratio enhancement circuit. | 09-18-2008 |
| 20080246541 | Demodulator for Amplitude-Modulated Signals - A demodulator circuit (DMOD) for amplitude-modulated signals is defined which comprises a threshold switch module (SWS), wherein a signal output (SA) of the threshold switch module (SWS) is connected to the output (DA) of the demodulator circuit (DMOD) and a signal input (SE) of the threshold switch module (SWS) is connected via a first capacitor (C | 10-09-2008 |
| 20090096520 | DETECTOR OF A RADIO-FREQUENCY SIGNAL - A method and a circuit for detecting a radio-frequency signal, including at least one first MOS transistor with a channel of a first type, having its gate coupled to an input terminal capable of receiving said signal; a circuit for biasing the first transistor, capable of biasing it to a level lower than its threshold voltage; and a circuit for determining the average value of the current in the first transistor. | 04-16-2009 |
| 20090309652 | DEMODULATION CIRCUIT FOR ASK CODED OR AMPLITUDE MODULATED SIGNALS AS WELLS AS NFC AND RFID DEVICES COMPRISING THE SAME - Conventional modulation envelope demodulators for amplitude modulated signals (e.g. ASK coded signals RX) contain rectifier elements which extract a baseband signal BB. Disadvantageously, due to a non-linear characteristic of the rectifier elements, an amplitude of the baseband signal BB depends on an amplitude of the high-frequent carrier signal. The present invention discloses an improved demodulation circuit for demodulating of ASK coded or amplitude modulated signals. This is achieved by using a sampling mixer | 12-17-2009 |
| 20100060351 | Chip Card Having an Adjustable Demodulation Unit - The present invention shows a contactless chip card comprising a controllable demodulation unit for demodulating an amplitude-modulated carrier signal, a measuring unit for determining a degree of modulation of the modulated carrier signal, and a control unit for controlling the demodulation unit on the basis of the determined degree of modulation of the carrier signal. | 03-11-2010 |
| 20100066443 | DEMODULATION APPARATUS, TEST APPARATUS AND ELECTRONIC DEVICE - A demodulation apparatus that demodulates an amplitude-phase-modulated signal having a level and a transition phase selected from among a plurality of levels and a plurality of phases according to transmission data, comprising a clock recovering section that receives the amplitude-phase-modulated signal and recovers a clock signal synchronized with the amplitude-phase-modulated signal; an amplitude and phase detecting section that detects, with the clock signal as a reference, the level and the transition phase of the amplitude-phase-modulated signal; a data output section that outputs data corresponding to the level and the transition phase detected by the amplitude and phase detecting section; and a phase difference correcting section that outputs a correction signal for correcting an oscillation frequency of the clock signal output by the clock recovering section, according to the transition phase detected by the amplitude and phase detecting section. | 03-18-2010 |
| 20100194472 | DIGITAL DEMODULATION DEVICE AND RELATED METHOD - A digital demodulation device for demodulating an amplitude modulation (AM) signal whose carrier has a first frequency includes: a processing circuit for performing first path digital processing and second path digital processing according to a second frequency and digital values of the AM signal, where the first path digital processing represents performing down conversion by mixing the AM signal with a first sinusoidal signal whose frequency is equal to the second frequency, the second path digital processing represents performing down conversion by mixing the AM signal with a second sinusoidal signal whose frequency is equal to the second frequency, the second frequency is equal to the first frequency plus a predetermined frequency shift, and the second sinusoidal signal is orthogonal to the first sinusoidal signal; and an output stage for outputting an output signal according to processing results of the first path digital processing and the second path digital processing. | 08-05-2010 |
| 20100231293 | APPARATUS FOR TYPE-A DEMODULATION AND INTEGRATED CIRCUIT CARD INCLUDING THE SAME - A type-A demodulator comprising a first rectifier configured to rectify a radio frequency (RF) signal received through an antenna and output a first voltage, a second rectifier configured to rectify the voltage of the RF signal received through the antenna and output a second voltage having a different voltage level than the first voltage, and a pause data detector configured to compare the first voltage with the second voltage and detect received pause data. | 09-16-2010 |
| 20100327967 | TEST APPARATUS, DEMODULATION APPARATUS, TEST METHOD, DEMODULATION METHOD AND ELECTRIC DEVICE - Provided is a test apparatus for testing a device under test that outputs, as an output signal, an amplitude-phase modulated signal having a level and a transition point phase selected from among a plurality of levels and a plurality of phases according to transmission data, the test apparatus comprising a comparing section that compares the output signal to a first comparison level, which is less than the expected level, before the expected phase, and compares the output signal to a second comparison level, which is greater than the expected level, and to a third comparison level, which is less than the expected level, after the expected phase; and a judging section that judges that the output signal matches the expected values on a condition that (i) the output signal is less than or equal to the first comparison level before the expected phase and (ii) the output signal is less than or equal to the second comparison level and greater than or equal to the third comparison level after the expected phase. | 12-30-2010 |
| 20110050336 | MULTI-CHIP STACK STRUCTURE AND SIGNAL TRANSMISSION METHOD THEREOF - A multi-chip stack structure and a signal transmission method are disclosed in specification and drawing, where the multi-chip stack structure includes first and second chips. The first chip includes a first inductance coil with a first series capacitor, and the second chip includes a second inductance coil with a second series capacitor. The first and second inductance coils are magnetically coupled to each other. The magnetically coupled inductance coils and the capacitors constitute a coupling filter. | 03-03-2011 |
| 20110074500 | APPARATUS AND METHOD FOR DETERMINATION OF SIGNAL FORMAT - The determination of the signal modulation format for a channel is an important aspect of the operation of a signal receiver. A method ( | 03-31-2011 |
| 20110074501 | DEMODULATOR AND DEMODULATION METHOD - A demodulator according to the present invention is the demodulator that demodulates a plurality of received symbols having different amplitude of carrier wave. The demodulator includes an amplitude value calculation unit that calculates a received symbol amplitude value by adding an absolute value of in-phase component and an absolute value of quadrature component determined from the amplitude of the carrier wave in the received symbol. Further, the demodulator includes a demodulation unit that detects a change of the received symbol amplitude value calculated by the amplitude value calculation unit, and demodulates the received symbol based on the detection result. | 03-31-2011 |
| 20110133831 | Demodulator for Simultaneous Multi-Node Receiving and the Method Thereof - The present invention relates to a demodulator for simultaneous multi-node receiving and a method therof; and, more particularly, a demodulator in a wireless communication system for receiving signals from multi nodes simultaneously and a method thereof. | 06-09-2011 |
| 20120112831 | MODULATION AND DEMODULATION CIRCUIT - The invention relates to modulation and demodulation circuits, such as envelope detectors used to demodulate amplitude-modulated (AM) signals. By coupling an analog circuit to a port of a digital component, a compact envelope detector can be obtained, which achieves demodulation of AM signals for direct coupling into a digital input port. Accordingly, a compact envelope detector may be used in the data receiving part of a sealed device requiring post-manufacturing data transfer, in combination with additional components that provide electromagnetic coupling, such as inductive, capacitive, or radiative. An example of such a device is a credit card sized authentication token. | 05-10-2012 |
| 20120313698 | DYNAMIC ADJUSTING RFID DEMODULATION CIRCUIT - A dynamic adjusting RFID demodulator circuit includes an envelope detector having an input for receiving a modulated RF signal, a fixed reference generator coupled to the input of an RC filter, an RF level dependent signal path adding to the fixed reference level at higher RF energy levels, a comparator having a first input coupled to an output of the envelope detector, a second input coupled to an output of the RC filter, and an output for providing a data output signal. | 12-13-2012 |
| 20130314152 | DEMODULATION CIRCUIT AND RFID TAG INCLUDING THE DEMODULATION CIRCUIT - An object is to provide a demodulation circuit having a sufficient demodulation ability. Another object is to provide an RFID tag which uses a demodulation circuit having a sufficient demodulation ability. A material which enables a reverse current to be small enough, for example, an oxide semiconductor material, which is a wide bandgap semiconductor, is used in part of a transistor included in a demodulation circuit. By using the semiconductor material which enables a reverse current of a transistor to be small enough, a sufficient demodulation ability can be secured even when an electromagnetic wave having a high amplitude is received. | 11-28-2013 |
| 20140253229 | BASK DEMODULATOR AND METHOD FOR DEMODULATING BASK MODULATED SIGNAL - A BASK demodulator includes a signal modifying circuit and a low pass filter (LPF) that couples an amplifier to an output of the modifying circuit. The modifying circuit includes a signal scaling circuit, a rectifying circuit and an AC coupling circuit. A signal shaping circuit couples an output of the amplifier to an output of the demodulator. The signal scaling circuit scales an input BASK modulated signal to provide an unclipped scaled and biased alternating signal that alternates about a bias voltage at a minimum carrier frequency. The rectifying circuit rectifies the unclipped signal to provide a partially rectified signal that is decoupled by the AC coupling circuit to provide a clipped scaled and biased alternating signal. The LPF removes the signal from the clipped scaled and biased alternating signal to provide a demodulated signal, which then is amplified by the amplifier and shaped by the shaping circuit. | 09-11-2014 |
| 329348000 | Having plural demodulation outputs | 2 |
| 20090160546 | AM (AMPLITUDE MODULATION) DEMODULATION SYSTEM FOR RFID READER DEVICE - AM (Amplitude Modulation) demodulation system ( | 06-25-2009 |
| 20130154728 | Adaptive Filtering of Blocker Signals in Demodulators - Some embodiments of the invention relate a transimpedance amplifier circuit having a negative feedback network that provides additional filtering of an out-of-band transmitted signal is provided herein. In one embodiment, the transimpedance amplifier circuit has a first pole, transimpedance amplifier having a multi-stage operational amplifier with an input terminal and an output terminal. An RC feedback network extends from the output terminal to the input terminal. A negative feedback network, extending from an internal node of the multi-stage operational amplifier to an input terminal of the single pole, transimpedance amplifier provides a negative feedback signal with an amplitude having an opposite polarity as the out-of-band transmitted signal. The negative feedback signal suppresses the out-of-band-transmitted signals within the demodulator circuit, thereby improving linearity of the transimpedance amplifier circuit. | 06-20-2013 |
| 329349000 | Having specific distortion, noise or other interference prevention, reduction or compensation | 4 |
| 20140266420 | LOGARITHMIC AMPLIFIER WITH UNIVERSAL DEMODULATION CAPABILITIES - A logarithmic amplifier (LDA) is described that includes an amplifier configured to oscillate a modulated input signal, a feedback establishing a 180 degree phase shift between the amplifier input and the output and maintaining oscillation of the input signal, a parallel resonant circuit connected to the amplifier output causing the amplifier to resonate at or around a center frequency, and a controller connected to the amplifier input cyclically terminating oscillation of the input signal each time a pre-determined threshold of current is detected, the controller including a low pass filter configured to generate a second output signal having a repetition frequency. The LDA may be used for AM with or without a PLL and/or a superhetrodyne. The LDA may be implemented as a mixer and used for phase demodulation. The LDA may be used for phase demodulation. The LDA may be used in place of a low noise amplifier. | 09-18-2014 |
| 20160173050 | LOGARITHMIC AMPLIFIER WITH UNIVERSAL DEMODULATION CAPABILITIES | 06-16-2016 |
| 329353000 | Noise reduction or compensation | 2 |
| 20120119827 | DEMODULATORS - Disclosed herein is a demodulator, including: a splitting/matching section for carrying out a matching process of making the amplitude and phase of a first modulated signal match respectively the amplitude and phase of a second modulated signal; and a demodulation section for generating a demodulated signal on the basis of the first modulated signal and the second modulated signal, which have been subjected to the matching process carried out by the splitting/matching section, wherein the splitting/matching section has a splitting section, a first matching section, and a second matching section, the first circuit-element constants determining the first input impedance of the first matching section and the second circuit-element constants determining the second input impedance of the second matching section are set at values determined in advance in order to make the first input impedance equal to the second input impedance. | 05-17-2012 |
| 20150295543 | LOGARITHMIC AMPLIFIER WITH UNIVERSAL DEMODULATION CAPABILITIES - A logarithmic amplifier (LDA) is described that includes an amplifier configured to oscillate a modulated input signal, a feedback establishing a 180 degree phase shift between the amplifier input and the output and maintaining oscillation of the input signal, a parallel resonant circuit connected to the amplifier output causing the amplifier to resonate at or around a center frequency, and a controller connected to the amplifier input cyclically terminating oscillation of the input signal each time a pre-determined threshold of current is detected, the controller including a low pass filter configured to generate a second output signal having a repetition frequency. The LDA may be used for AM with or without a PLL and/or a superheterodyne. The LDA may be implemented as a mixer and used for phase demodulation. The LDA may be used for phase demodulation. The LDA may be used in place of a low noise amplifier. | 10-15-2015 |
| 329358000 | Input signal combined with local oscillator or carrier frequency signal (e.g., synchronous demodulator) | 1 |
| 20130113551 | ENVELOPE DETECTOR - The envelope detector for detecting an envelope of a digital modulation signal in accordance with an embodiment of the present invention, includes: a mixer configured to receive the digital modulation signal and output a square signal squaring the digital modulation signal when being applied with bias voltage; a bias voltage applying unit configured to apply the bias voltage to the mixer; and a DC blocking capacitor configured to be connected to the mixer to block DC component included in the square signal. In accordance with the embodiment of the present invention, it is possible to provide the envelope detector having the simple structure while having the good receiving sensitivity and the wide dynamic range characteristics and detect the envelope of the modulated signal without transmitting the carrier signal in the transmitter and generating the separate signal in the receiver, thereby saving the costs consumed to implement the transceiver. | 05-09-2013 |
| 329363000 | Input signal split into plural signals | 1 |
| 329364000 | Including three or more terminal discrete semiconductor device | 1 |
| 20100127770 | ELECTRONIC CIRCUIT AND ELECTRONIC DEVICE INCLUDING ELECTRONIC CIRCUIT - An electronic circuit includes: a circuit that generates a first input signal and a second input signal that are balanced differential signals; a first envelope detection circuit that includes a first input terminal, a second input terminal, and a first output terminal, the first input signal being input to the first input terminal via a first impedance element, the second input signal being input to the second input terminal via a second impedance element, and outputs from the first output terminal a first output signal that is the sum of the square of the first input signal and the square of the second input signal; a second envelope detection circuit that includes a third input terminal, a fourth input terminal, and a second output terminal, the first input signal being input to the third input terminal via a third impedance element, the second input signal being input to the fourth input terminal via a fourth impedance element, and outputs from the second output terminal a second output signal that is twice the value obtained by squaring the average of the first input signal and the second input signal; and a differential circuit that generates a differential signal from the first output signal and the second output signal. | 05-27-2010 |
| 329369000 | Including three or more terminal discrete semiconductor demodulator device | 4 |
| 20090153240 | COMPARATOR WITH SENSITIVITY CONTROL - A comparator has a differential input stage, a current source coupled to the differential input stage for providing a tail current to one side of the differential input stage, and a differential load coupled to the differential pair and having at least one diode coupled load transistor per differential side. A load current through either one of the at least one diode coupled load transistor on either differential side is mirrored with a current mirror configuration to provide a current be fed to a respective node, each node being coupled to a respective variable biasing current source and a respective other side of the differential input stage, so as to provide a variable positive feedback to the differential input stage. | 06-18-2009 |
| 20090243716 | DEMODULATION CIRCUIT - A demodulation circuit, including: an input terminal (IN) inputting a current amplitude modulated signal; a first transistor ( | 10-01-2009 |
| 20130194036 | ENVELOPE DETECTION APPARATUS DYNAMICALLY CONTROLLED IN RESPONSE TO INPUT SIGNAL AND ENVELOPE DETECTION METHOD THEREOF - An envelope detection apparatus dynamically controlled in response to an input signal and an envelope detection method thereof are provided. The envelope detection apparatus includes an envelope detector configured to output an envelope of an input signal. The envelope detection apparatus further includes a detection band determination unit configured to determine a detection band based on the input signal. The envelope detection apparatus further includes a detection band controller configured to control a detection band of the envelope detector based on the determined detection band. | 08-01-2013 |
| 20140118061 | DEMODULATION APPARATUS AND METHOD FOR OPERATING THE SAME - A demodulation apparatus comprises: an envelope detecting unit configured to receive a signal from the outside and detect an envelope signal from the received signal; a reference voltage generating unit configured to generate a reference voltage on the basis of the detected envelope signal; a comparator configured to output a pulse signal on the basis of the envelope signal detected by the envelope detecting unit and the reference voltage generated by the reference voltage generating unit; and an input signal adjusting unit connected with an envelope signal input terminal of the comparator to selectively adjust a magnitude of the envelope signal input to the comparator. | 05-01-2014 |
| 329370000 | Including diode demodulator device | 1 |
| 20080265987 | SIGNAL EXTRACTION CIRCUIT - A shunt regulator performs a control so as to stabilize a voltage obtained by rectifying the radio frequency signal output from an antenna unit at a prescribed voltage value. A signal extraction unit extracts the information signal from a bypass current sent by the shunt regulator for the control when the voltage fluctuates. | 10-30-2008 |
