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公开(公告)号：US20200162125A1
公开(公告)日：2020-05-21
申请号：US16773448
申请日：2020-01-27
发明人： Feng Wei KUO , William Wu SHEN , Chewn-Pu JOU , Huan-Neng CHEN , Lan-Chou CHO
摘要： A communication system includes a modulator configured to generate a modulated signal responsive to at least a data signal, and a demodulator configured to demodulate the modulated signal responsive to a first carrier signal. The demodulator includes a filter configured to generate a filtered first signal based on a first signal, and a gain adjusting circuit coupled to the filter. The first signal is based on the first carrier signal and modulated signal. The filter has a gain controlled by a set of control signals. The gain adjusting circuit is configured to adjust the gain of the filter, and to generate the set of control signals based on a voltage of the filtered first signal and a voltage of the first signal. The gain adjusting circuit includes a first peak detector coupled to the filter, and configured to detect a peak value of the voltage of the filtered first signal.
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公开(公告)号：US10554255B2
公开(公告)日：2020-02-04
申请号：US16105572
申请日：2018-08-20
发明人： Feng Wei Kuo , William Wu Shen , Chewn-Pu Jou , Huan-Neng Chen , Lan-Chou Cho
IPC分类号： H04B3/04 , H03H7/01 , H03G5/28 , H03G3/30 , H03H11/04 , H04L27/38 , H04B17/21 , H04B1/00 , H04B1/10
摘要： A communication system includes a demodulator configured to demodulate an amplified modulated signal responsive to a first carrier signal. The demodulator includes a filter and a gain adjusting circuit. The filter is configured to generate a filtered first signal based on a first signal. The first signal is based on the first carrier signal and the amplified modulated signal. The filter has a gain adjusted based on a set of control signals. The gain adjusting circuit is coupled to the filter, and configured to generate the set of control signals based on at least a voltage of the filtered first signal or a voltage of a second signal. The gain adjusting circuit includes a first peak detector configured to output a peak value of the voltage of the second signal. The voltage of the second signal includes a voltage of the first signal or a voltage of a reference signal.
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33.发明授权公开(公告)号：US10520963B2
公开(公告)日：2019-12-31
申请号：US15966997
申请日：2018-04-30
发明人： Zhenghao Cui , Yadan Shen
摘要： Regulating voltages at inputs of an electronic device by performing at least the following: receiving, at a voltage monitoring circuit, a monitoring voltage corresponding to a power system, determining, at the voltage monitoring circuit, whether the monitoring voltage is equal to or exceeds a monitoring threshold voltage, receiving, at the voltage monitoring circuit, an output indicating whether an inputted reference voltage and an inputted feedback voltage at a comparator circuit differs, regulating, at the voltage monitoring circuit, a feedback voltage to match the inputted reference voltage based on the output and a determination that the monitoring voltage is equal to or exceeds the monitoring threshold voltage, and providing, from the voltage monitoring circuit, the feedback voltage as an updated inputted feedback voltage for the comparator circuit.
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34.发明申请公开(公告)号：US20190196524A1
公开(公告)日：2019-06-27
申请号：US15966997
申请日：2018-04-30
发明人： Zhenghao CUI , Yadan SHEN
摘要： Regulating voltages at inputs of an electronic device by performing at least the following: receiving, at a voltage monitoring circuit, a monitoring voltage corresponding to a power system, determining, at the voltage monitoring circuit, whether the monitoring voltage is equal to or exceeds a monitoring threshold voltage, receiving, at the voltage monitoring circuit, an output indicating whether an inputted reference voltage and an inputted feedback voltage at a comparator circuit differs, regulating, at the voltage monitoring circuit, a feedback voltage to match the inputted reference voltage based on the output and a determination that the monitoring voltage is equal to or exceeds the monitoring threshold voltage, and providing, from the voltage monitoring circuit, the feedback voltage as an updated inputted feedback voltage for the comparator circuit.
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公开(公告)号：US10277182B2
公开(公告)日：2019-04-30
申请号：US15833458
申请日：2017-12-06
申请人： Tensorcom, Inc.
发明人： Zaw Soe , Kevin Jing , Steve Gao
摘要： A circuit comprises a Sallen-Key filter, which includes a source follower that implements a unity-gain amplifier; and a programmable-gain amplifier coupled to the Sallen-Key filter. The circuit enables programmable gain via adjustment to a current mirror copying ratio in the programmable-gain amplifier, which decouples the bandwidth of the circuit from its gain settings. The programmable-gain amplifier can comprise a differential voltage-to-current converter, a current mirror pair, and programmable output gain stages. The Sallen-Key filter and at least one branch in the programmable-gain amplifier can comprise transistors arranged in identical circuit configurations.
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公开(公告)号：US09912311B2
公开(公告)日：2018-03-06
申请号：US15164389
申请日：2016-05-25
发明人： So-Young Kang , Thomas Byung-Hak Cho , Hee-Seon Shin , Su-Seob Ahn , Jong-Mi Lee , Min-Gyu Jo
CPC分类号： H03G1/0029 , H03F1/14 , H03F3/45183 , H03F3/4521 , H03F3/45475 , H03F3/45659 , H03F3/72 , H03F2200/153 , H03F2200/411 , H03F2203/45522 , H03F2203/45526 , H03F2203/45591 , H03G1/0088 , H03G3/001 , H03G5/28 , H03H11/1256 , H03H11/126
摘要： Provided is a reconfigurable amplifier. The reconfigurable amplifier includes a gain circuit including a gain path configured to amplify an input signal, and a feed forward circuit including a feed forward path configured to receive the input signal and perform feed forward compensation on the input signal, and a first control circuit configured to perform the feed forward compensation in a first mode by activating the feed forward path, and deactivate the feed forward path in a second mode different from the first mode.
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公开(公告)号：US08264263B2
公开(公告)日：2012-09-11
申请号：US13061056
申请日：2010-02-03
申请人： Koichi Hirama
发明人： Koichi Hirama
IPC分类号： H03G5/28
CPC分类号： H03H7/21 , H03H2007/0192
摘要： A composite resonance circuit is provided of which the resonance frequency is variable over a wide frequency range without changing the circuit constant of a non-resonant element having no resonance frequency. The composite resonance circuit comprises an input terminal; a resonance unit having first and second ports and quasi-resonating in response to AC signals respectively supplied to these ports; and phase shift circuits that perform different phase shifts on an AC signal supplied to the input terminal and supply first and second shifted signals subjected to the phase shift respectively to the first and second ports. The resonance unit is an impedance circuit that has at least four input terminals forming the first and second ports and that generates a quasi-resonant peak current under non-zero reactance in response to the first and second shifted signals coming in via the first and second ports. The quasi-resonant peak current is variable according to the frequency and phase shift quantities of the AC signals. Namely, the resonance frequency can be made to be variable.
摘要翻译： 提供了一种复合谐振电路，其谐振频率在宽频率范围内可变，而不改变不具有共振频率的非谐振元件的电路常数。 复合谐振电路包括输入端; 谐振单元，具有第一和第二端口，并响应于分别提供给这些端口的AC信号而准谐振; 以及相位偏移电路，其在提供给输入端的AC信号上执行不同的相移，并将经过相移的第一和第二移位信号分别提供给第一和第二端口。 谐振单元是具有形成第一和第二端口的至少四个输入端的阻抗电路，并且响应于经由第一和第二端口进入的第一和第二移位信号，在非零电抗下产生准谐振峰值电流 港口。 准谐振峰值电流根据交流信号的频率和相移量而变化。 也就是说，谐振频率可以变化。
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公开(公告)号：US20110148515A1
公开(公告)日：2011-06-23
申请号：US13061056
申请日：2010-02-03
申请人： Koichi Hirama
发明人： Koichi Hirama
IPC分类号： H03G5/28
CPC分类号： H03H7/21 , H03H2007/0192
摘要： A composite resonance circuit is provided of which the resonance frequency is variable over a wide frequency range without changing the circuit constant of a non-resonant element having no resonance frequency. The composite resonance circuit comprises an input terminal; a resonance unit having first and second ports and quasi-resonating in response to AC signals respectively supplied to these ports; and phase shift circuits that perform different phase shifts on an AC signal supplied to the input terminal and supply first and second shifted signals subjected to the phase shift respectively to the first and second ports. The resonance unit is an impedance circuit that has at least four input terminals forming the first and second ports and that generates a quasi-resonant peak current under non-zero reactance in response to the first and second shifted signals coming in via the first and second ports. The quasi-resonant peak current is variable according to the frequency and phase shift quantities of the AC signals. Namely, the resonance frequency can be made to be variable.
摘要翻译： 提供了一种复合谐振电路，其谐振频率在宽频率范围内可变，而不改变不具有共振频率的非谐振元件的电路常数。 复合谐振电路包括输入端; 谐振单元，具有第一和第二端口，并响应于分别提供给这些端口的AC信号而准谐振; 以及相位偏移电路，其在提供给输入端的AC信号上执行不同的相移，并将经过相移的第一和第二移位信号分别提供给第一和第二端口。 谐振单元是具有形成第一和第二端口的至少四个输入端的阻抗电路，并且响应于经由第一和第二端口进入的第一和第二移位信号，在非零电抗下产生准谐振峰值电流 港口。 准谐振峰值电流根据交流信号的频率和相移量而变化。 也就是说，谐振频率可以变化。
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公开(公告)号：US4399561A
公开(公告)日：1983-08-16
申请号：US220609
申请日：1980-12-29
申请人： Gerald K. Lunn , Michael McGinn
发明人： Gerald K. Lunn , Michael McGinn
CPC分类号： H03G5/28 , H03H11/481
摘要： A circuit having a variable input impedance which is controlled by application of a direct current input signal. The variable impedance circuit comprises a pair of capacitors coupled in series with a pair of diodes. The diodes are rendered conductive in response to the direct current control signal to substantially short the two capacitors in series with one another across the input terminals of the circuit. With no direct control signal being applied to the circuit the diodes are non-conductive which substantially disconnects the capacitors from appearing across the inputs of the circuit. Hence, the reactance component of the input impedance of the circuit is varied in response to the direct control signal.
摘要翻译： 具有通过施加直流输入信号控制的可变输入阻抗的电路。 可变阻抗电路包括与一对二极管串联耦合的一对电容器。 响应于直流控制信号使二极管导通，以使电路的输入端彼此串联地基本上短路两个电容器。 由于没有直接的控制信号被施加到电路上，所以二极管是非导通的，其基本上断开电容器不会出现在电路的输入端。 因此，电路的输入阻抗的电抗分量响应于直接控制信号而变化。
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公开(公告)号：US4356568A
公开(公告)日：1982-10-26
申请号：US918513
申请日：1978-06-23
申请人： Minoru Ogita , Naobumi Kimura
发明人： Minoru Ogita , Naobumi Kimura
CPC分类号： H04H40/72 , H03G5/24 , H03G5/28 , H04B1/1027
摘要： A receptive condition automatic selection device for an FM receiver comprises a band width changing circuit for changing a band width of an intermediate-frequency amplifier of the receiver, a first detector for detecting a noise level contained in a demodulation signal from a demodulator, a second detector for detecting a tuning condition of the receiver by the demodulation signal and a bistable circuit connected to said first and second detectors for producing a control signal for the band width changing circuit. The band width of the intermediate-frequency amplifier can be automatically changed to either a narrow band or a wide band in accordance with receptive conditions of the FM receiver.
摘要翻译： 用于FM接收机的接收状态自动选择装置包括用于改变接收机的中频放大器的带宽的带宽改变电路，用于检测来自解调器的解调信号中包含的噪声电平的第一检测器，第二 检测器，用于通过解调信号检测接收机的调谐状态;连接到所述第一和第二检测器的双稳态电路，用于产生用于带宽改变电路的控制信号。 根据FM接收机的接收条件，中频放大器的带宽可以自动改变为窄带或宽带。
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