| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 81 | Chopper amplifier | EP14164784.2 | 2014-04-15 | EP2797230A3 | 2015-01-21 | Nagashisa, Takeshi |
A chopper amplifier includes a chopper modulator to modulate a certain detection signal and a bias voltage by a certain control signal and output a chopper modulation signal, a first differential amplifier to differentially amplify the chopper modulation signal from the chopper modulator and output a differential modulation signal, a chopper demodulator to demodulate the differential modulation signal from the first differential amplifier by the control signal and output a demodulation signal, a second differential amplifier to extract a detection signal component from the demodulation signal, and a plurality of filters connected at an input terminal of the second differential amplifier and having different cutoff frequencies from each other relative to the demodulation signal.
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| 82 | Chopper amplifier | EP14164784.2 | 2014-04-15 | EP2797230A2 | 2014-10-29 | Nagashisa, Takeshi |
A chopper amplifier includes a chopper modulator to modulate a certain detection signal and a bias voltage by a certain control signal and output a chopper modulation signal, a first differential amplifier to differentially amplify the chopper modulation signal from the chopper modulator and output a differential modulation signal, a chopper demodulator to demodulate the differential modulation signal from the first differential amplifier by the control signal and output a demodulation signal, a second differential amplifier to extract a detection signal component from the demodulation signal, and a plurality of filters connected at an input terminal of the second differential amplifier and having different cutoff frequencies from each other relative to the demodulation signal.
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| 83 | Integrated amplifier for driving acoustic transducers | EP10172369.0 | 2010-08-10 | EP2418768B1 | 2013-04-24 | Nicollini, Germano; Guanziroli, Federico; Orio, Massimo; Pinna, Carlo |
| 84 | SWITCHING AMPLIFIERS | EP08849951.2 | 2008-11-14 | EP2218175A2 | 2010-08-18 | ATTWOOD, Brian E.; TAYLOR, Wilson E.; HAND, Larry E. |
| Systems and methods implemented in a switching amplifier for providing consistent, matching switching between top and bottom switching devices in a switching amplifier. One embodiment includes a half-bridge circuit output stage, a driver stage and a transformer. The driver stage, which drives the switches of the output stage, is very fast, has a low propagation delay, and has minimal input capacitance. The transformer drives the drive paths from the transformer inputs to the switches. The transformer avoids resonances within the audio band and at the amplifier switching frequencies, has low and spread free leakage inductance, has enough magnetizing inductance to keep transformer currents low in proportion to the total driver stage current drain, has low core losses at the switching frequency, has minimal inductance change and operates well below its saturation point. The amplifier stage provides a substantially constant amplitude drive signal to the output power switching devices. | ||||||
| 85 | CHOPPER-STABILIZED INSTRUMENTATION AMPLIFIER FOR IMPEDANCE MEASUREMENT | EP07811832.0 | 2007-03-23 | EP2119000B1 | 2010-05-26 | DENISON, Timothy J.; SANTA, Wesley A. |
| 86 | CHOPPER-STABILIZED AMPLIFIER WITH ANALOG-DRIVEN LEVEL SHIFTER | US16042006 | 2018-07-23 | US20190207573A1 | 2019-07-04 | Cornel D. STANESCU; Razvan PUSCASU |
| A chopper-stabilized amplifier that includes an analog driven level shifter is disclosed. The analog driven level shifter changes the levels of a pair of complementary clock signals according to a level associated with an input signal to the chopper-stabilized amplifier. The level shifted complementary clock signals are used to control switching devices used for chopping input signals of various voltages. The chopper-stabilized amplifier also includes symmetrical passive RC notch filters having two cut-off frequencies to reduce ripple noise from the chopping. | ||||||
| 87 | RIPPLE REDUCTION FILTER FOR CHOPPED AMPLIFIERS | US15982666 | 2018-05-17 | US20180337639A1 | 2018-11-22 | Tony Ray Larson; Dimitar Trifonov Trifonov; Biraja Prasad Dash |
| Embodiments relate to a chopped amplifier system where a ripple reduction filter placed outside of a main signal path is disclosed. The chopped amplifier system includes a chopped amplifier having an input terminal and an output terminal, where the input terminal receives an input signal and the output terminal provides an output signal including a ripple that is based on an offset voltage of the chopped amplifier. The ripple reduction filter is placed in a feedback loop path that receives a portion of the chopped amplifier's output signal and provides a feedback signal to the chopped amplifier that reduces the ripple at the output of the chopped amplifier. The ripple reduction filter includes a digital controller and other circuits that can handle large disturbances such as large signal slew rate events and large common-mode steps without reducing the effectiveness of the ripple reduction filter in reducing the ripple. | ||||||
| 88 | Single-ended amplifier circuit with improved chopper configuration | US15603004 | 2017-05-23 | US10116267B2 | 2018-10-30 | Stefano Polesel; Germano Nicollini |
| An amplifier circuit a differential input stage coupled to a first input and to a second input between which a differential input voltage is present. A converter stage is coupled to the input stage to convert the differential input voltage into a converted voltage. An output stage is coupled to the converter stage and generates, starting from the converted voltage, an output voltage on a single output of the amplifier circuit. A biasing stage is coupled to the input stage and to the output stage to supply a biasing current. A chopper module reduces a contribution of offset and noise associated with the output voltage. The chopper module is coupled to the input stage, converter stage, and to the biasing stage. The chopper module includes an input chopper stage, a converter chopper stage, and a biasing chopper stage that operate jointly under control of a chopper signal. | ||||||
| 89 | Pseudo-random chopper amplifier | US15194229 | 2016-06-27 | US10038408B2 | 2018-07-31 | Scott Cameron McLeod |
| A chopper stabilized amplifier that utilizes a multi-frequency chopping signal to reduce chopping artifacts. By utilizing a multi-frequency chopping signal, the amplifier DC offset and flicker noise are translated to the higher chopping frequencies but are also smeared, or spread out in frequency and consequently lowered in amplitude. This lower amplitude signal allows for less stringent filtering requirements. | ||||||
| 90 | Filter-less chopping for offset cancellation | US15165809 | 2016-05-26 | US09912309B1 | 2018-03-06 | Reuven Ecker; Shimon Avitan |
| Aspects of the disclosure provide an amplifier system and a method for dynamically cancelling an offset voltage. The amplifier system includes a chopper amplifier system that includes a differential amplifier with an offset calibration circuit. The chopper amplifier system is configured to generate an output signal including voltage variations indicating an offset voltage of the differential amplifier. The amplifier system also includes a feedback circuit configured to determine a polarity of the offset voltage of the differential amplifier based on the output signal, and to transmit a control signal to the offset calibration circuit to reduce the offset voltage of the differential amplifier. | ||||||
| 91 | ACTIVE ELECTRODE HAVING A CLOSED-LOOP UNIT-GAIN AMPLIFIER WITH CHOPPER MODULATION | US15626621 | 2017-06-19 | US20170281037A1 | 2017-10-05 | Preben KIDMOSE; Xiong ZHOU; Soren KILSGAARD; Qiang LI |
| An active electrode has an electrode for sensing an electric potential and generating an input signal, and a shield placed near the electrode but being electric insulated from the electrode. An integrated amplifier (10) has an input connected to the at least one electrode for receiving the input signal, and providing a buffered path outputting a buffered output signal. The shield being connected to the output of the integrated amplifier to actively drive the electrical potential of the shield, thereby providing an active shielding of the electrode. The buffered path includes a first mixer (11) in front of the integrated amplifier for frequency shifting the input signal from a basic frequency range to a higher frequency range, and a second mixer (12) on the output of the integrated amplifier for frequency shifting the amplified signal from the higher frequency range back to the basic frequency range. The active electrode may be used for recording EEG signals. | ||||||
| 92 | PREAMPLIFIER | US15083297 | 2016-03-29 | US20170085251A1 | 2017-03-23 | Wen-Sheng Lin |
| A preamplifier including a programmable gain amplifying circuit and a filtering circuit is provided. The programmable gain amplifying circuit has a single output terminal. The filtering circuit includes a first switched-capacitor filter and a second switched-capacitor filter. The first switched-capacitor filter is coupled to the single output terminal. The second switched-capacitor filter is connected in parallel with the first switched-capacitor filter. The first switched-capacitor filter and the second switched-capacitor filter are respectively switched between a first mode and a second mode. When the first switched-capacitor filter is switched to the first mode, the second switched-capacitor filter is switched to the second mode. | ||||||
| 93 | Chopper Stabilized Amplifier With Synchronous Switched Capacitor Noise Filtering | US15276002 | 2016-09-26 | US20170077881A1 | 2017-03-16 | Eric Blom |
| A chopper stabilzed amplifier with synchronous switched capacitor noise filtering is disclosed. In an exemplary embodiment, an apparatus includes a chopper amplifier having an input that receives an input signal and an output that outputs an amplified signal. The chopper amplifier includes an input chopping circuit and an output chopping circuit, where the input and output chopping circuits operate in response to a chop clock. The apparatus also includes a switched capacitor filter having an input that receives the amplified signal and an output that outputs a filtered signal. The switched capacitor filter operates in response to a filter clock. The apparatus also includes a filter timing adjuster that receives a reference voltage and adjusts a phase of the filter clock with respect to the chop clock to reduce chopper noise on that reference voltage. | ||||||
| 94 | Operational amplifier | US14648775 | 2013-12-03 | US09584079B2 | 2017-02-28 | Shinichi Ouchi |
| There is provided an operational amplifier which is operable as well when an operating voltage decreases without creating a range where a circuit would not operate or reducing circuit gain. High-pass filters 102-105 provide output signals therefrom to bias-set input nodes of differential amplifiers Gm1-Gm4 to a potential within a common-mode range in which the respective differential amplifiers Gm1-Gm4 are operable. In this manner, the respective differential amplifiers Gm1-Gm4 can be operated effectively regardless of the possible decrease in a supply voltage, enabling normal amplifying operation. In addition, reduction in gain due to the reduced operational voltage is avoided. Therefore, it is preferably applicable to the application where digital and analog circuits are loaded together on the same IC chip. When a high-pass filter is required at each input side of two- or more-stage differential amplifiers, a phase compensation method utilizing multiple paths is provided for a lower range of a phase margin created at the low frequency side, enabling normal amplitude operation. | ||||||
| 95 | GATED CDS INTEGRATOR | US15277223 | 2016-09-27 | US20170019080A1 | 2017-01-19 | Gerard T. Quilligan; Shahid Aslam |
| A Gated CDS Integrator (GCI) may amplify low-level signals without introducing excessive offset and noise. The GCI may also amplify the low level signals with accurate and variable gain. The GCI may include a modulator preceding an amplifier such that offset or noise present in a signal path between the modulator and a demodulator input is translated to a higher out of band frequency, and thereafter reduced by a double sampled discrete time integrator which also reduces thermal noise. The thermal noise may also be reduced by averaging the output of the discrete time integrator. | ||||||
| 96 | PSEUDO-RANDOM CHOPPER AMPLIFIER | US15194229 | 2016-06-27 | US20160380598A1 | 2016-12-29 | Scott Cameron McLeod |
| A chopper stabilized amplifier that utilizes a multi-frequency chopping signal to reduce chopping artifacts. By utilizing a multi-frequency chopping signal, the amplifier DC offset and flicker noise are translated to the higher chopping frequencies but are also smeared, or spread out in frequency and consequently lowered in amplitude. This lower amplitude signal allows for less stringent filtering requirements. | ||||||
| 97 | Semiconductor integrated circuit device | US14638630 | 2015-03-04 | US09484870B2 | 2016-11-01 | Shinji Nakatsuka; Shigeo Imai; Yosuke Ogawa |
| A device includes an operational-amplifier including an amplifier-part amplifying signals and transmitting amplified signals to a first and a second nodes, and an output-part connected to the first and second nodes and outputting signals from a first and a second outputs. The device includes a first and a second chopper switches and a first and second phase-compensation capacity elements. A first capacitance switch switches between a first connection-state and a second connection-state. In the first connection-state, the first phase-compensation-capacity element is connected between the first node and the first output and the second phase-compensation-capacity element is connected between the second node and the second-output. In the second connection state, the first phase-compensation-capacity element is connected between the second-node and the second output and the second phase-compensation-capacity element is connected between the first node and the first output. | ||||||
| 98 | Signal processing circuit, resolver digital converter, and multipath nested mirror amplifier | US14827519 | 2015-08-17 | US09473088B2 | 2016-10-18 | Yoshihiro Funato; Toshio Kumamoto; Tomoaki Yoshizawa; Kazuaki Kurooka |
| A signal processing circuit includes a chopper amplifier that has a differential amplifier circuit that amplifies differential input signals Vsp(t) and Vsm(t), and an adder circuit that generates an addition signal Vfil(t) by addition of the chopper output signal Vsub(t) that the chopper amplifier generates. Differential signals inputted into the differential amplifier circuit are interchanged for every first phase period and second phase period, and the adder circuit generates the addition signal by addition of the chopper output signal in the first phase period and in the second phase period. | ||||||
| 99 | GATED CDS INTEGRATOR | US14847907 | 2015-09-08 | US20160294332A1 | 2016-10-06 | Gerard T. Quilligan; Shahid Aslam |
| A Gated CDS Integrator (GCI) may amplify low-level signals without introducing excessive offset and noise. The GCI may also amplify the low level signals with accurate and variable gain. The GCI may include a modulator preceding a linear amplifier such that offset or noise present in a signal path between the modulator and a demodulator input is translated to a higher out of band frequency. | ||||||
| 100 | INSTRUMENTATION AMPLIFIER | US14709057 | 2015-05-11 | US20160079941A1 | 2016-03-17 | Shupeng ZHONG |
| An instrumentation amplifier includes: a capacitive feedback closed-loop amplifier, an input capacitor charging module, a feedback capacitor discharging module, a noise separation module and a logic controller. The capacitive feedback closed-loop amplifier includes a fully differential operational amplifier, a first input capacitor, a second input capacitor, a first feedback capacitor and a second feedback capacitor. The input capacitor charging module is configured to charge the first input capacitor and the second input capacitor periodically. The feedback capacitor discharging module is configured to discharge the first feedback capacitor and the second feedback capacitor periodically. The noise separation module is configured to separate a noise from a signal using a chopping modulation technology. The logic controller is connected to the input capacitor charging module, the feedback capacitor discharging module and the noise separation module to control the modules to operate. | ||||||
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