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1. 发明申请

US20180323748A1 Methods of adjusting gain error in instrumentation amplifiers 审中-公开
公开(公告)号：US20180323748A1
公开(公告)日：2018-11-08
申请号：US15887199
申请日：2018-02-02
申请人： Microchip Technology Incorporated
发明人： Serban Motoroiu , Jim Nolan
IPC分类号： H03F1/12 , H03F3/45 , H03F1/34
CPC分类号： H03F1/12 , H03F1/342 , H03F3/45179 , H03F3/45183 , H03F3/45672 , H03F2200/258 , H03F2200/261 , H03F2203/45048 , H03F2203/45138 , H03F2203/45341 , H03F2203/45342 , H03F2203/45466 , H03F2203/45494 , H03F2203/45504 , H03F2203/45511 , H03F2203/45521 , H03G1/0023 , H03G1/0029 , H03G1/0088
摘要： A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a trimming circuit that trims the back-bias voltages of the transistors in each transconductor. The trimming circuit includes a plurality of selectable resistors disposed in the signal path of the tail current in each transconductor. Each of the plurality of selectable resistors has a switch coupled to it. When a switch is closed, only the resistors up to the respective switch are in the signal path of the bulk-to-source voltage of the differentially paired transistors. The resistor trimming circuit reduces the mismatch between transconductances of the respective differential pair transistors, in turn reducing mismatch of the overall transconductances of the transconductors, and thereby reducing the CFIA's gain error.

2. 发明授权

US09793859B1 Amplifier output power limiting circuitry 有权
公开(公告)号：US09793859B1
公开(公告)日：2017-10-17
申请号：US15276871
申请日：2016-09-27
申请人： Raytheon Company
发明人： Valery S. Kaper , John P. Bettencourt
IPC分类号： H03F1/30 , H03F1/02 , H03F3/195
CPC分类号： H03F1/0216 , H03F1/0261 , H03F1/3205 , H03F3/193 , H03F3/195 , H03F2200/15 , H03F2200/18 , H03F2200/258 , H03F2200/451
摘要： An amplifier system having: an amplifier having a linear operating region where an output signal produced by the amplifier at the output terminal has a power level increasing proportionally with the increasing input signal power level up to a compression region of the amplifier where the output power is inhibited from increasing with increasing input signal power; and a DC current limiting circuit, coupled between a DC power supply and the amplifier, to: supply DC current from the DC power supply that is equal to quiescent current to the amplifier from the DC power supply when the amplifier operates in the linear region; enable the amplifier to draw increasing DC current from the DC power supply above the quiescent current with increasing input signal power until the output signal power reaches the desired compression point level which is lower than that of a stand-alone amplifier without the DC current limiting circuit; and, then limits the current drawn by the amplifier from the DC power supply.

3. 发明申请

US20170230020A1 Class D Switching Amplifier and Method of Controlling a Loudspeaker 审中-公开
公开(公告)号：US20170230020A1
公开(公告)日：2017-08-10
申请号：US15497313
申请日：2017-04-26
申请人： STMicroelectronics S.r.I.
发明人： Marco Raimondi , Edoardo Botti
IPC分类号： H03F3/45 , H03F3/217 , H03F3/185
CPC分类号： H03F3/45932 , H03F1/0205 , H03F3/183 , H03F3/185 , H03F3/211 , H03F3/217 , H03F3/2173 , H03F2200/03 , H03F2200/129 , H03F2200/171 , H03F2200/258 , H03F2200/351 , H03F2200/78 , H03F2203/21106
摘要： A switching amplifier includes a first half-bridge PWM modulator, a second half-bridge PWM modulator, and at least one amplifier stage configured to receive input signals. The switching amplifier also includes a PWM control stage configured to control switching of the first PWM modulator and of the second PWM modulator as a function of the input signals, by respective first PWM control signals and second PWM control signals. The amplifier stage and the PWM control stage have a fully differential structure.

4. 发明申请

US20100045381A1 LIMITING AMPLIFIERS 有权
公开(公告)号：US20100045381A1
公开(公告)日：2010-02-25
申请号：US12613794
申请日：2009-11-06
申请人： Shen-Iuan Liu , Chih-Hung Lee
发明人： Shen-Iuan Liu , Chih-Hung Lee
IPC分类号： H03F3/45
CPC分类号： H03F3/08 , H03F3/45179 , H03F3/45183 , H03F2200/258 , H03F2203/45638
摘要： A limiting amplifier with an input stage with dc offset cancellation, identical gain stages, an output buffer and a feedback filter. The input stage receives a differential input signal and outputs a first intermediate differential signal. The gain stages are cascaded to amplify the first intermediate differential signal and generate a second intermediate differential signal, amplified by the output buffer to produce an output signal. The feedback filter provides a dc offset voltage of the output signal to the input stage for the dc offset cancellation. The input stage comprises a resistor network coupled between a pair of input nodes and a power line and comprising a common resistor, a pair of load resistors and a shunt resistor. The load resistors share a common terminal connected to the common resistor that is connected to the power line. The shunt resistor has two terminals respectively connected to the load resistors.

5. 发明申请

US20080186097A1 AUDIO POWER AMPLIFIER APPARATUS 失效
标题翻译：音频功率放大器装置
公开(公告)号：US20080186097A1
公开(公告)日：2008-08-07
申请号：US12025427
申请日：2008-02-04
申请人： Giovanni STOCHINO , Secondo Porra'
发明人： Giovanni STOCHINO , Secondo Porra'
IPC分类号： H03F3/217 , H03F1/36
CPC分类号： H03F3/187 , H03F1/3211 , H03F1/3229 , H03F1/34 , H03F3/45475 , H03F2200/03 , H03F2200/258 , H03F2200/537 , H03F2200/541 , H03F2201/3215
摘要： The invention concerns an audio power amplifier apparatus capable of providing at low manufacturing cost extremely low non-linear distortion, even lower than −120 dB, comprising a main power amplifying section (3) the output of which is series connected to a secondary of a coupling transformer T1, in turn connected to the apparatus output (IO4), the apparatus being characterised in that the amplifying section (3) provides an output signal Vma having a negative feed-back loop non-inverting gain, and in that it further comprises a cascade of one or more sections (5, 6), the inputs of which are connected to the output of the input section (1) and to the output of the amplifying section (3), and the output of which is constituted of a secondary winding of the transformer T1, the cascade being capable to very accurately extract the error signal Ve with respect to the amplified signal Vi from the signal at the output of the amplifying section and to provide to its output an exact, but anti-phase, copy thereof in a predetermined very wide frequency band, so as to carry out a feed-forward error correction function that, for the first time, is particularly effective in cancelling the error of the amplifying section (3) without interactions with the same and in a very wide frequency band, and in avoiding in a very stable and reliable way, any risk of stress and overload for the transformer T1.
摘要翻译：本发明涉及能够以低制造成本提供甚至低于-120dB的非常低的非线性失真的音频功率放大器装置，其包括主功率放大部分（3），其主要功率放大部分（3）串联连接到耦合变压器T 1又连接到装置输出端（IO4），该装置的特征在于放大部分（3）提供具有负的反馈回路非反相增益的输出信号Vma，并且其中还包括一个或多个部分（5,6）的级联，其输入连接到输入部分（1）的输出端和放大部分（3）的输出端，其输出端构成的变压器T1的次级绕组，级联能够从放大部分的输出处的信号中非常精确地提取关于放大的信号Vi的误差信号Ve，并且向其输出提供e xact，但是在预定的非常宽的频带中具有反相，复制，以便执行前馈纠错功能，其首次在消除放大部分（3）的误差方面特别有效，没有与相同和非常宽的频带的相互作用，并且以非常稳定和可靠的方式避免变压器T1的应力和过载的任何风险。

6. 发明授权

US07123045B2 Semiconductor integrated circuit device 失效
标题翻译：半导体集成电路器件
公开(公告)号：US07123045B2
公开(公告)日：2006-10-17
申请号：US10936802
申请日：2004-09-09
申请人： Mikiya Doi , Kenichi Nakata
发明人： Mikiya Doi , Kenichi Nakata
IPC分类号： H03K17/16 , H03K19/003
CPC分类号： H03F1/523 , H03F2200/258
摘要： When an output voltage output from a buffer approaches a ground voltage, a MOS transistor turns off, so that clamp for a gate of the MOS transistor is released.
摘要翻译：当从缓冲器输出的输出电压接近接地电压时，MOS晶体管截止，从而释放MOS晶体管的栅极的钳位。

7. 发明申请

US20170230017A1 SWITCHING AMPLIFIER AND RADIO TRANSMITTER 有权
公开(公告)号：US20170230017A1
公开(公告)日：2017-08-10
申请号：US15501257
申请日：2015-04-24
申请人： NEC Corporation
发明人： Shinichi HORI
IPC分类号： H03F3/217 , H03F3/193 , H04B1/04 , H03F1/22
CPC分类号： H03F3/2171 , H03F1/223 , H03F3/193 , H03F3/217 , H03F3/2173 , H03F3/245 , H03F2200/258 , H03F2200/432 , H03F2200/451 , H04B1/04
摘要： A switching amplifier provided, at a minimum, with: a first input transistor into which one of two input signals that operate in a complementary manner is input; a first cascode transistor cascade-connected between the first input transistor and a power supply; a second input transistor into which the other of the two input signals is input; and a second cascode transistor cascade-connected between the second input transistor and the first input transistor; the switching amplifier extracting an output signal, a connection point between the first input transistor and the second cascode transistor being used as an output terminal; wherein a first potential limiting circuit and a second potential limiting circuit for limiting the potential fluctuation range are respectively connected to the input terminal of the first cascode transistor and the input terminal of the second cascode transistor.

8. 发明申请

US20160373074A1 Bias Circuitry For Depletion Mode Amplifiers 有权
标题翻译：偏置电路用于耗尽模式放大器
公开(公告)号：US20160373074A1
公开(公告)日：2016-12-22
申请号：US15175610
申请日：2016-06-07
申请人： Raytheon Company
发明人： John P. Bettencourt , Alan J. Bielunis , Istvan Rodriguez , Zhaoyang C. Wang
IPC分类号： H03F3/195 , H03F3/213
CPC分类号： H03F3/195 , H03F1/301 , H03F1/303 , H03F3/193 , H03F3/213 , H03F3/72 , H03F2200/18 , H03F2200/258 , H03F2200/27 , H03F2200/451 , H03F2203/7203
摘要： A circuit having an amplifier, comprising: a depletion mode transistor having a source electrode coupled to a reference potential; a drain electrode coupled to a potential more positive than the reference potential; and a gate electrode for coupling to an input signal. The circuit includes a bias circuit, comprising: a current source; and biasing circuitry coupled to the current source and between the potential more positive than the reference potential and a potential more negative than the reference potential. A control circuit is connected to the current source for controlling the amount of current produced by the current source to the biasing circuitry.
摘要翻译：一种具有放大器的电路，包括：耗尽型晶体管，具有耦合到参考电位的源电极; 耦合到比参考电位更正的电位的漏电极; 以及用于耦合到输入信号的栅电极。该电路包括偏置电路，包括：电流源; 以及耦合到电流源并且在比参考电位更正的电位和比参考电位更负的电位的偏置电路。控制电路连接到电流源，用于控制由电流源产生的电流量到偏置电路。

9. 发明授权

US07783260B2 Method and apparatus for adaptively controlling signals 有权
公开(公告)号：US07783260B2
公开(公告)日：2010-08-24
申请号：US11417477
申请日：2006-04-27
申请人： Ronald D. McCallister , Eric M. Brombaugh
发明人： Ronald D. McCallister , Eric M. Brombaugh
IPC分类号： H04B17/00
CPC分类号： H03G3/3047 , H03F1/0205 , H03F3/24 , H03F2200/165 , H03F2200/258 , H03G3/3042 , H04B1/0475 , H04L27/2624
摘要： A signal processing system according to various aspects of the present invention includes an excursion signal generator, a scaling system and a filter system. The excursion signal generator identifies a peak portion of a signal that exceeds a threshold and generates a corresponding excursion signal. The scaling system applies a real scale factor to contiguous sets of excursion samples in order to optimize peak-reduction performance. The filter system filters the excursion signal to remove unwanted frequency components from the excursion signal. The filtered excursion signal may then be subtracted from a delayed version of the original signal to reduce the peak. The signal processing system may also control power consumption by adjusting the threshold. The signal processing system may additionally adjust the scale of the excursion signal and/or individual channel signals, such as to meet constraints on channel noise and output spectrum, or to optimize peak reduction. The magnitude threshold, excursion signal and/or individual channel signals may also be adaptively adjusted based on, for example, a channel signal quality such as a noise level specification.

10. 发明授权

US07747224B2 Method and apparatus for adaptively controlling signals 有权
标题翻译：用于自适应控制信号的方法和装置
公开(公告)号：US07747224B2
公开(公告)日：2010-06-29
申请号：US12335969
申请日：2008-12-16
申请人： Ronald D. McCallister , Eric M. Brombaugh
发明人： Ronald D. McCallister , Eric M. Brombaugh
IPC分类号： H04B17/00
CPC分类号： H03G3/3047 , H03F1/0205 , H03F3/24 , H03F2200/165 , H03F2200/258 , H03G3/3042 , H04B1/0475 , H04L27/2624
摘要： A signal processing system according to various aspects of the present invention includes an excursion signal generator, a scaling system and a filter system. The excursion signal generator identifies a peak portion of a signal that exceeds a threshold and generates a corresponding excursion signal. The scaling system applies a real scale factor to contiguous sets of excursion samples in order to optimize peak-reduction performance. The filter system filters the excursion signal to remove unwanted frequency components from the excursion signal. The filtered excursion signal may then be subtracted from a delayed version of the original signal to reduce the peak. The signal processing system may also control power consumption by adjusting the threshold. The signal processing system may additionally adjust the scale of the excursion signal and/or individual channel signals, such as to meet constraints on channel noise and output spectrum, or to optimize peak reduction. The magnitude threshold, excursion signal and/or individual channel signals may also be adaptively adjusted based on, for example, a channel signal quality such as a noise level specification.
摘要翻译：根据本发明的各个方面的信号处理系统包括偏移信号发生器，缩放系统和滤波器系统。偏移信号发生器识别超过阈值的信号的峰值部分，并产生相应的偏移信号。缩放系统将实际比例因子应用于连续的偏移样本集，以优化峰值降低性能。滤波器系统对偏移信号进行滤波以从偏移信号中去除不需要的频率分量。然后可以从原始信号的延迟版本中减去滤波的偏移信号以减小峰值。信号处理系统还可以通过调整阈值来控制功耗。信号处理系统可以另外调整偏移信号和/或单个信道信号的比例，例如以满足对信道噪声和输出频谱的约束，或者优化峰值减小。幅度阈值，偏移信号和/或单个信道信号也可以基于例如诸如噪声电平指定的信道信号质量自适应地调整。

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