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公开(公告)号：US20230254606A1
公开(公告)日：2023-08-10
申请号：US18194756
申请日：2023-04-03
发明人： Shankar RAMAKRISHNAN
IPC分类号： H04N25/778 , H03F1/22 , H03G1/00 , H03K5/08 , G11C27/02 , H03F1/34 , H03F3/72 , H04N25/75 , H04N25/772
CPC分类号： H04N25/778 , H03F1/223 , H03G1/0094 , H03K5/08 , G11C27/026 , H03F1/34 , H03F3/72 , H04N25/75 , H04N25/772 , H03M1/1245
摘要： Various embodiments of the present technology may provide methods and apparatus for a track-and-hold amplifier configured to sample and amplify an analog signal. Methods and apparatus for a track-and-hold amplifier according to various aspects of the present invention may provide an isolation circuit configured to isolate transient current in a track-and-hold capacitor during a track phase. According to various embodiments, selective activation of the isolation circuit provides a settling time that is independent of the gain of the amplifier.
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公开(公告)号：US09966915B2
公开(公告)日：2018-05-08
申请号：US15222355
申请日：2016-07-28
CPC分类号： H03G3/30 , H03F3/45475 , H03F3/45995 , H03F2200/171 , H03F2203/45044 , H03G1/0088 , H03G1/0094 , H03G3/001 , H03G5/28
摘要： A programmable amplifier includes an amplifier, an input capacitor, a feedback circuit, and a high-pass filter circuit. The amplifier has an input coupled to the input capacitor for receiving an input signal. The feedback circuit includes multiple feedback capacitors of differing capacitance values that are each selectively coupled between the output of the amplifier and the input of the amplifier using multiple first switches. The high-pass filter circuit includes multiple switched capacitors of differing capacitance values that are each selectively coupled between the amplifier output and a ground node using multiple second switches. The first switches are configured to be selectively switched on for activating at least one feedback capacitor to adjust a gain of the amplifier, while the second switches are configured to be selectively switched at a first and second phase of a clock signal to adjust a high-pass cutoff frequency of the amplifier independently of how the gain is adjusted.
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公开(公告)号：US20180062595A1
公开(公告)日：2018-03-01
申请号：US15788505
申请日：2017-10-19
申请人： OLYMPUS CORPORATION
发明人： Masato Osawa , Yasunari Harada , Hideki Kato
CPC分类号： H03F3/72 , H03F1/26 , H03F3/45475 , H03F2200/135 , H03F2200/213 , H03F2200/411 , H03F2200/45 , H03F2203/45514 , H03F2203/45551 , H03F2203/7231 , H03G1/0094 , H03G3/001 , H03M1/1245
摘要： In a semiconductor device, a first variable gain amplifier and a second variable gain amplifier constitute a switched capacitor type variable gain amplifier. A selection switch switches connection among the first variable gain amplifier, the second variable gain amplifier, and a load circuit such that the first variable gain amplifier and the load circuit are connected to each other when an amplification factor of the first variable gain amplifier is a predetermined gain or less, and the second variable gain amplifier is connected between the first variable gain amplifier and the load circuit when the amplification factor of the first variable gain amplifier is larger than the predetermined gain.
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公开(公告)号：US20180034430A1
公开(公告)日：2018-02-01
申请号：US15222355
申请日：2016-07-28
CPC分类号： H03G3/30 , H03F3/45475 , H03F3/45995 , H03F2200/171 , H03F2203/45044 , H03G1/0088 , H03G1/0094 , H03G3/001 , H03G5/28
摘要： A programmable amplifier includes an amplifier, an input capacitor, a feedback circuit, and a high-pass filter circuit. The amplifier has an input coupled to the input capacitor for receiving an input signal. The feedback circuit includes multiple feedback capacitors of differing capacitance values that are each selectively coupled between the output of the amplifier and the input of the amplifier using multiple first switches. The high-pass filter circuit includes multiple switched capacitors of differing capacitance values that are each selectively coupled between the amplifier output and a ground node using multiple second switches. The first switches are configured to be selectively switched on for activating at least one feedback capacitor to adjust a gain of the amplifier, while the second switches are configured to be selectively switched at a first and second phase of a clock signal to adjust a high-pass cutoff frequency of the amplifier independently of how the gain is adjusted.
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公开(公告)号：US09853617B2
公开(公告)日：2017-12-26
申请号：US15168832
申请日：2016-05-31
发明人： Marco Sautto , Fabio Quaglia , Giulio Ricotti , Andrea Mazzanti
CPC分类号： H03G1/0094 , H03F3/005 , H03F3/2175 , H03F3/45 , H03F3/45264 , H03F2200/312 , H03F2203/45288
摘要： A programmable-gain amplifier includes: two complementary cross-coupled transistor pairs mutually coupled with each transistor in one pair having a current flow path cascaded with a current flow path of a respective one of the transistors in the other pair. First and second coupling points are formed between the pairs; with first and second sampling capacitors coupled thereto. First and second input stages have input terminals to input signals for sampling by the first and second sampling capacitors. Switching means couple the first and second input stages to the sampling capacitors so the input signals are sampled as sampled signals on the sampling capacitors. The switching means energizes the complementary cross-coupled transistor pairs so the signals sampled on the sampling capacitors undergo negative resistance regeneration growing exponentially over time to thereby provide an exponential amplifier gain.
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公开(公告)号：US20170179897A1
公开(公告)日：2017-06-22
申请号：US15168832
申请日：2016-05-31
发明人： Marco Sautto , Fabio Quaglia , Giulio Ricotti , Andrea Mazzanti
CPC分类号： H03G1/0094 , H03F3/005 , H03F3/2175 , H03F3/45 , H03F3/45264 , H03F2200/312 , H03F2203/45288
摘要： A programmable-gain amplifier includes: two complementary cross-coupled transistor pairs mutually coupled with each transistor in one pair having a current flow path cascaded with a current flow path of a respective one of the transistors in the other pair. First and second coupling points are formed between the pairs; with first and second sampling capacitors coupled thereto. First and second input stages have input terminals to input signals for sampling by the first and second sampling capacitors. Switching means couple the first and second input stages to the sampling capacitors so the input signals are sampled as sampled signals on the sampling capacitors. The switching means energizes the complementary cross-coupled transistor pairs so the signals sampled on the sampling capacitors undergo negative resistance regeneration growing exponentially over time to thereby provide an exponential amplifier gain.
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公开(公告)号：US09673700B2
公开(公告)日：2017-06-06
申请号：US15222095
申请日：2016-07-28
发明人： John P. Lesso , John L. Pennock , Peter J. Frith
CPC分类号： H02M3/07 , H03F1/025 , H03F3/185 , H03F3/187 , H03F3/68 , H03F2200/507 , H03F2200/511 , H03G1/0017 , H03G1/0029 , H03G1/0088 , H03G1/0094
摘要： A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.
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公开(公告)号：US20170149398A1
公开(公告)日：2017-05-25
申请号：US15144531
申请日：2016-05-02
发明人： Nitin Agarwal , Aniruddha Roy
CPC分类号： H03G1/0094 , H02M3/07 , H03G1/0029 , H03G3/001 , H03G5/28 , H03K5/08
摘要： A compensation circuit includes an amplifier coupled between a first voltage terminal and a common terminal. The amplifier has a first output terminal. A current source transistor has a current path coupled between a second voltage terminal and a second output terminal. A threshold voltage sense transistor has a current path coupled between the first and second output terminals. A gate and drain of the threshold voltage sense transistor are connected. An output transistor having a current path coupled between the first output terminal and a third output terminal has a gate coupled to the second output terminal.
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9.发明授权公开(公告)号：US09214911B2
公开(公告)日：2015-12-15
申请号：US13599779
申请日：2012-08-30
CPC分类号： H03G1/0094 , H03F3/181 , H03F2200/03 , H03G3/3026
摘要： In accordance with an embodiment, a system for amplifying a signal provided by a capacitive signal source includes an impedance converter having an input node configured to be coupled to a first terminal of the capacitive signal source, and an adjustable capacitive network having a first node configured to be coupled to a second terminal of the capacitive signal source and a second node coupled to an output node of the impedance converter.
摘要翻译： 根据实施例，用于放大由电容信号源提供的信号的系统包括具有被配置为耦合到电容性信号源的第一端子的输入节点的阻抗转换器和具有第一节点配置的可调电容网络 耦合到电容性信号源的第二端子，以及耦合到阻抗转换器的输出节点的第二节点。
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公开(公告)号：US09088257B2
公开(公告)日：2015-07-21
申请号：US13834953
申请日：2013-03-15
CPC分类号： H03F1/0205 , H03F1/0255 , H03F3/19 , H03F3/21 , H03F3/217 , H03F2200/102 , H03F2200/451 , H03G1/0017 , H03G1/0094 , H03G3/004 , H03G3/20 , H03G3/3042
摘要： A device for controlling operation of a power amplifier includes a detector, a reference signal generator and a controller. The detector is configured to detect a voltage level of an output signal of the power amplifier with respect to a predetermined boost threshold and to generate a corresponding detection signal and a reference signal. The controller is configured to provide a supply voltage to an output transistor of the power amplifier based on a comparison of the detection signal and the reference signal, the supply voltage being a no boost voltage, which is substantially the same as a supply voltage, when the comparison indicates that the voltage level is within the predetermined boost threshold, and the supply voltage being one of multiple boost voltages when the detection signal indicates that the voltage level is beyond the predetermined boost threshold. The controller generates the boost voltages by boosting the supply voltage.
摘要翻译： 用于控制功率放大器的操作的装置包括检测器，参考信号发生器和控制器。 检测器被配置为相对于预定升压阈值检测功率放大器的输出信号的电压电平并产生相应的检测信号和参考信号。 所述控制器被配置为基于所述检测信号和所述参考信号的比较来提供所述功率放大器的输出晶体管的电源电压，所述电源电压是与供电电压基本相同的非升压电压， 比较表示当检测信号指示电压电平超过预定升压阈值时，电压电平处于预定升压阈值内，并且电源电压是多个升压电压之一。 控制器通过提高电源电压来产生升压电压。
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