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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

US20190245501A1 SIGNAL LEVEL DETECTION AND OVERRANGE SIGNAL LIMITER AND CLAMP FOR ELECTRONIC CIRCUITS 审中-公开
公开(公告)号：US20190245501A1
公开(公告)日：2019-08-08
申请号：US15887544
申请日：2018-02-02
申请人： Analog Devices, Inc.
发明人： Huseyin DINC , Bryce GRAY , Ahmed Mohamed Abdelatty ALI
IPC分类号： H03G3/30 , H03F1/52
CPC分类号： H03G3/30 , H03F1/523 , H03F2200/258 , H03F2200/78
摘要： One embodiment is an apparatus including a detector circuit electrically coupled between a signal source and a second circuit, the signal source generating a first signal, the detector circuit detecting a level of the first signal and generating a first control signal when the detected level of the first signal exceeds a first threshold value, and a clamping switch electrically coupled to receive the first control signal from the detector circuit, the clamping switch including a multi-terminal active device. The first control signal controls a state of the clamping switch such that the clamping switch clamps a level of a signal applied to the second circuit when the level of the first signal exceeds the first threshold value.

8. 发明授权

US09948247B2 RF amplifier 有权
公开(公告)号：US09948247B2
公开(公告)日：2018-04-17
申请号：US15209816
申请日：2016-07-14
申请人： NXP B.V.
发明人： Gian Hoogzaad
IPC分类号： H03F1/52 , H03F3/195 , H03F1/22 , H03F3/45
CPC分类号： H03F1/52 , H03F3/195 , H03F3/45475 , H03F2200/18 , H03F2200/258 , H03F2200/294 , H03F2200/426 , H03F2200/441 , H03F2200/444 , H03F2200/451 , H03F2200/462 , H03F2200/481 , H03F2200/489 , H03F2200/492 , H03F2200/78
摘要： An RF amplifier comprising an input-transistor having an input-transistor-base terminal, an input-transistor-collector terminal and an input-transistor-emitter terminal; a degeneration-component connected between the input-transistor-emitter terminal and a ground terminal; and a protection-transistor having a protection-transistor-base terminal, a protection-transistor-collector terminal and a protection-transistor-emitter terminal. The input-transistor-base terminal is connected to the protection-transistor-emitter terminal, and the protection-transistor-base terminal is connected to the input-transistor-emitter.

9. 发明授权

US09647610B2 RF amplification device with power protection during high supply voltage conditions 有权
公开(公告)号：US09647610B2
公开(公告)日：2017-05-09
申请号：US15140605
申请日：2016-04-28
申请人： RF Micro Devices, Inc.
发明人： Praveen V. Nadimpalli , David Ngo
IPC分类号： H03F1/02 , H03F3/21 , H03F3/19 , H03K3/354 , G05F1/56 , H03F1/52
CPC分类号： H03F1/0222 , G05F1/561 , H03F1/523 , H03F3/19 , H03F3/21 , H03F2200/258 , H03F2200/408 , H03F2200/451 , H03F2203/21193
摘要： A radio frequency (RF) amplification device comprises an RF amplification circuit, and a dynamic level shifter (DLS) circuit coupled between a supply voltage and the RF amplification circuit. The DLS circuit is configured to provide a first shifted voltage to the RF amplification circuit via a first diode when the supply voltage is above a first threshold voltage level. The DLS circuit is further configured to provide a second shifted voltage to the RF amplification circuit via a first shunt transistor when the supply voltage is below the first threshold voltage level, wherein the supply voltage less the second shifted voltage is less than the supply voltage less the first shifted voltage.

10. 发明申请

US20160043696A1 CLASS D SWITCHING AMPLIFIER AND METHOD OF CONTROLLING A LOUDSPEAKER 有权
标题翻译： D类开关放大器和控制扬声器的方法
公开(公告)号：US20160043696A1
公开(公告)日：2016-02-11
申请号：US14797934
申请日：2015-07-13
申请人： STMICROELECTRONICS S.R.L.
发明人： Marco RAIMONDI , Edoardo BOTTI
IPC分类号： H03F1/02 , H03F3/21 , H03F3/217 , H03F3/183
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.
摘要翻译：开关放大器包括第一半桥PWM调制器，第二半桥PWM调制器和被配置为接收输入信号的至少一个放大器级。开关放大器还包括PWM控制级，被配置为通过相应的第一PWM控制信号和第二PWM控制信号来控制作为输入信号的函数的第一PWM调制器和第二PWM调制器的切换。放大器级和PWM控制级具有完全差分结构。

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