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121. 发明授权

US5111159A Amplifier circuit with open-loop gain that can be varied with respect to closed-loop gain 失效
标题翻译：具有开环增益的放大器电路可以相对于闭环增益而变化
公开(公告)号：US5111159A
公开(公告)日：1992-05-05
申请号：US665471
申请日：1991-03-06
申请人： Hiroshi Arakawa
发明人： Hiroshi Arakawa
IPC分类号： H03F1/34 , H03F1/08 , H03G3/12
CPC分类号： H03F1/083
摘要： An operational amplifier circuit has an inverting and a noninverting input terminal and an output terminal and a current source circuit. A signal output from the output terminal is fed back to the inverting input terminal via a resistor for setting a closed-loop gain of the amplifier. To a part of a current path of the current source circuit is connected a resistor for changing the current of the current circuit to set an arbitrary open-loop gain of the amplifier.
摘要翻译：运算放大器电路具有反相和非反相输入端以及输出端和电流源电路。从输出端子输出的信号通过用于设定放大器的闭环增益的电阻器反馈到反相输入端子。电流源电路的电流路径的一部分连接有用于改变电流电路的电流以设置放大器的任意开环增益的电阻器。

122. 发明授权

US5006814A Current amplifier 失效
公开(公告)号：US5006814A
公开(公告)日：1991-04-09
申请号：US420111
申请日：1989-10-10
申请人： Colin J. Wilson
发明人： Colin J. Wilson
IPC分类号： H03F1/42 , G01Q10/06 , G01Q60/10 , G01Q60/24 , H03F1/08 , H03F3/08 , H03F3/34 , H03F3/68
CPC分类号： H03F3/087 , H03F1/083
摘要： A current amplifier including two stages. A first stage is formed by a primary operational amplifier (IC1) connected in a virtual earth feedback configuration and having a feedback loop formed by a resistor (R1) and capacitor (C1) connected in parallel so that the primary operational amplifier has a frequency response up to a predetermined frequency and thereafter the frequency response rolls off at a predetermined rate. A second stage including another operational amplifier (IC2) connected in a virtual earth or non-inverting feedback configuration having a frequency characteristic chosen to provide in combination with the frequency characteristic of the primary amplifier a desired operating range for the amplifier. The predetermined frequency lies between the frequency extremes of the operating range and the frequency characteristic of the second stage has a constant gain up to said predetermined frequency and a gain matched with and complementary to the roll-off of the primary operational amplifier (IC1) above the predetermined frequency so that the overall frequency response of the current amplifier is flat over its operating range.

123. 发明授权

US4893092A Operational amplifier circuit 失效
标题翻译：运算放大器电路
公开(公告)号：US4893092A
公开(公告)日：1990-01-09
申请号：US252396
申请日：1988-09-30
申请人： Toshiyuki Okamoto
发明人： Toshiyuki Okamoto
IPC分类号： G06G7/12 , H03F1/08 , H03F1/32 , H03F3/34 , H03F3/345 , H03F3/45
CPC分类号： H03F1/3211
摘要： The operational amplifier circuit comprises a differential amplifier input stage for producing an amplified signal on the basis of an input voltage signal supplied thereto, an output stage for producing an output signal on the basis of the inverting voltage signal, biasing circuit operative to control the amounts of current respectively flowing through the input stage and the output stage, a phase compensating circuit for elimination of distortion in the amplified signal due to a noise on the power voltage, and a phase compensation supporting circuit for restriction of the variation of the amplified signal in a high-frequency operation.

124. 发明授权

US4855687A Transimpedance amplifier with noise reduction and bandwidth compensation 失效
标题翻译：具有降噪和带宽补偿的跨阻放大器
公开(公告)号：US4855687A
公开(公告)日：1989-08-08
申请号：US162130
申请日：1988-02-29
申请人： Hebert Raymond T.
发明人： Hebert Raymond T.
IPC分类号： H03F1/42 , H03F1/08
CPC分类号： H03F1/083
摘要： The signal-to-noise ratio of a transimpedance operational amplifier is enhanced by employing a large feedback resistor. Bandwidth lost in the process recaptured by a compensation network without reducing the signal-to-noise ratio. The compensation network provides a zero which cancels the upper 3 db pole of the transimpedance amplifier, and also provides a high frequency pole defining the restored bandwidth of amplifier.
摘要翻译：跨阻抗运算放大器的信噪比通过采用大的反馈电阻来增强。在补偿网络中重新捕获的过程中的带宽损失，而不降低信噪比。补偿网络提供零，消除跨阻放大器的上3db极，并提供定义放大器恢复带宽的高频极点。

125. 发明授权

US4835489A Single-ended, feed-forward gain stage 失效
标题翻译：单端，前馈增益级
公开(公告)号：US4835489A
公开(公告)日：1989-05-30
申请号：US214899
申请日：1988-06-29
申请人： Dennis M. Monticelli
发明人： Dennis M. Monticelli
IPC分类号： H03F1/08 , H03F1/48
CPC分类号： H03F1/083 , H03F1/483
摘要： In a non-inverting gain stage of the type that receives a single input and generates a single-ended output, the improvement comprising a feed-forward path which provides the input to the output when the supply is above a preselected frequency. The stage is capable of operation down to very low supply voltage (1V) and features rail-to-rail ouput swing.
摘要翻译：在接收单个输入并产生单端输出的类型的同相增益级中，改进包括当电源高于预选频率时将输入提供给输出的前馈路径。该级能够运行到非常低的电源电压（1V），并具有轨到轨输出摆幅。

126. 发明授权

US4794349A Fully differential, CMOS operational power amplifier 失效
标题翻译：全差分CMOS运算功率放大器
公开(公告)号：US4794349A
公开(公告)日：1988-12-27
申请号：US82608
申请日：1987-08-07
申请人： Daniel Senderowicz , Germano Nicollini
发明人： Daniel Senderowicz , Germano Nicollini
IPC分类号： H01L27/092 , H01L21/8238 , H03F1/08 , H03F3/20 , H03F3/26 , H03F3/30 , H03F3/34 , H03F3/45 , H03F3/68
CPC分类号： H03F3/3064 , H03F1/086 , H03F3/3028 , H03F3/45192 , H03F3/4565 , H03F2203/45421 , H03F2203/45574 , H03F2203/45674
摘要： A fully differential, CMOS, operational power amplifier, particularly useful as output buffer in monolithic analog subsystems, includes an input differential stage, two gain stages and two output stages. Each output stage may be individually provided with a functional feedback loop and locally compensated for reestablishing sufficient stability. An output common mode control circuit, operable in a continuous or sampled manner, is also contemplated, as well as a special circuit for controlling the DC biasing current through the output stages under rest conditions. The amplifier may be used indifferently as a balanced (differential) output or as a single-ended output amplifier without any depression of its performances.
摘要翻译：全差分CMOS运算功率放大器，特别适用于单片模拟子系统中的输出缓冲器，包括输入差分级，两个增益级和两个输出级。每个输出级可以单独地设置有功能反馈回路，并且被局部补偿以重新建立足够的稳定性。也可考虑以连续或采样方式操作的输出共模控制电路，以及用于在静止条件下控制通过输出级的直流偏置电流的特殊电路。放大器可以无差别地用作平衡（差分）输出或单端输出放大器，而不会降低其性能。

127. 发明授权

US4774478A Feedback amplifier compensation circuitry 失效
标题翻译：反馈放大器补偿电路
公开(公告)号：US4774478A
公开(公告)日：1988-09-27
申请号：US909654
申请日：1986-09-19
申请人： Stewart S. Taylor
发明人： Stewart S. Taylor
IPC分类号： H03F1/34 , H03F1/08 , H03F1/48
CPC分类号： H03F1/34 , H03F1/083 , H03F1/48
摘要： A frequency-compensated transistor feedback amplifier provides relatively wide bandwidth and relatively large phase and gain margins, irrespective of the transconductance of the transistors in the amplifier. Each one of three preferred embodiments (10, 50, 104) of the invention includes a transconductance stage (20, 68, 68) and an amplifier stage (12 and 14, 54, 54 and 14). The transconductance stage delivers an input signal to the amplifier stage, which produces an amplified replica of the input signal. A feedback capacitor (24, 88, 24 and 88) connected between the output and the input of the amplifier stage provides dominant pole compensation by which the magnitude of the loop gain diminishes by 6 dB/octave with increasing frequency. The capacitor provides a forward feedthrough path for any residual portion of the input signal so that the residual portion arrives at the output of the amplifier stage in substantially the same phase relation with that of the output signal of intermediate frequency. This invention can be implemented in circuitry whose input signal is taken from a transconductance stage that comprises an amplifier configured in either a single-ended output mode or a double-ended output mode.

128. 发明授权

US4757270A High gain feedback amplifier 失效
标题翻译：高增益反馈放大器
公开(公告)号：US4757270A
公开(公告)日：1988-07-12
申请号：US921217
申请日：1986-10-20
申请人： George H. S. Rokos
发明人： George H. S. Rokos
IPC分类号： H03F1/08 , H03F1/38 , H03H11/04 , H03H11/12 , H03F1/36
CPC分类号： H03H11/126 , H03F1/083 , H03F1/38 , H03H11/0416
摘要： Feedforward of the source signal into the compensation mode of an operational amplifier produces more than an order of magnitude improvement in small-signal capability at high frequencies. The technique is useful for active filters and wideband amplifiers. Further improvement will be available using amplifiers designed for this approach.
摘要翻译：源信号前馈到运算放大器的补偿模式，在高频下的小信号能力提高了一个数量级以上。该技术对于有源滤波器和宽带放大器是有用的。使用这种方法设计的放大器将进一步改进。

129. 发明授权

US4751474A Broadband amplifier incorporating a circuit device effective to improve frequency response 失效
标题翻译：宽带放大器结合了有效改善频率响应的电路设备
公开(公告)号：US4751474A
公开(公告)日：1988-06-14
申请号：US944584
申请日：1986-12-22
申请人： Alberto Gola
发明人： Alberto Gola
IPC分类号： H03F1/42 , H03F1/08 , H03F1/14 , H03F1/48 , H03F3/30 , H03F3/45 , H03F3/26
CPC分类号： H03F1/48 , H03F1/14 , H03F3/3076
摘要： A broadband amplifier comprising insulated collector vertical pnp transistors, a circuit device effective to improve frequency response, and a final stage comprising a so-called complementary pair formed of an npn transistor and a pnp transistor having emitters connected to each other and to an epitaxial layer n of the insulated collector vertical pnp transistor incorporated in the gain circuit of said amplifiers. The complementary pair afford minimization of the junction parasitic capacitances of the aforesaid vertical pnp transistor.
摘要翻译：一种宽带放大器，包括绝缘集电极垂直pnp晶体管，有效改善频率响应的电路装置，以及包括由npn晶体管和pnp晶体管形成的所谓的互补对的最终级，其具有彼此连接的发射极和外延层 n绝缘集电极垂直pnp晶体管，并入放大器的增益电路中。互补对提供了上述垂直pnp晶体管的结寄生电容的最小化。

130. 发明授权

US4745370A Adjustable phase shift circuit 失效
标题翻译：可调相移电路
公开(公告)号：US4745370A
公开(公告)日：1988-05-17
申请号：US81085
申请日：1987-08-30
申请人： Michael McGinn
发明人： Michael McGinn
IPC分类号： H03F1/08 , H03H11/20 , H03F3/45
CPC分类号： H03F1/083 , H03H11/20
摘要： A circuit for shifting the phase of an applied differential input signal is disclosed which includes first and second differential amplifiers each having an input across which the input signal is applied, each differential amplifier having an input and an output transistor the emitters of which are coupled together via a respective capacitor. A first resistor is coupled between the emitter of the input transistor of first one of the differential amplifiers and the emitter of the output transistor of the second differential amplifier while a second resistor is coupled between the emitter of the input transistor of the second differential amplifier and the emitter of the output transistor of the first differential amplifier.
摘要翻译：公开了一种用于移动所施加的差分输入信号的相位的电路，其包括第一和第二差分放大器，每个差分放大器具有施加输入信号的输入，每个差分放大器具有输入端和输出晶体管，其发射极耦合在一起通过相应的电容器。第一电阻器耦合在第一差分放大器的输入晶体管的发射极和第二差分放大器的输出晶体管的发射极之间，而第二电阻耦合在第二差分放大器的输入晶体管的发射极和第一差分放大器的输出晶体管的发射极。

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