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41. 发明授权

US07439803B1 Fully differential current-feedback CMOS/bipolar operational amplifier 有权
标题翻译：全差分电流反馈CMOS /双极运算放大器
公开(公告)号：US07439803B1
公开(公告)日：2008-10-21
申请号：US11788571
申请日：2007-04-20
申请人： Uday Dasgupta
发明人： Uday Dasgupta
IPC分类号： H03F3/45
CPC分类号： H03F3/45475 , H03F1/34 , H03F3/45183 , H03F3/45632 , H03F2200/513 , H03F2203/45366 , H03F2203/45431
摘要： A differential current amplifier circuit comprises a first low input impedance circuit that generates a first output current based on a first input current to the differential current amplifier circuit. A second low input impedance circuit generates a second output current based on a second input current to the differential current amplifier circuit. A first current subtraction circuit generates a first output voltage based on a difference between the first and the second output currents. A second current subtraction circuit generates a second output voltage based on a difference between the second and the first output currents.
摘要翻译：差分电流放大器电路包括第一低输入阻抗电路，其基于对差分电流放大器电路的第一输入电流产生第一输出电流。第二低输入阻抗电路基于到差分电流放大器电路的第二输入电流产生第二输出电流。第一电流减法电路基于第一和第二输出电流之间的差产生第一输出电压。第二电流减法电路基于第二和第一输出电流之间的差产生第二输出电压。

42. 发明授权

US07332971B2 Multi-gigabit/s transimpedance amplifier for optical networks 失效
标题翻译：用于光网络的多千兆位/秒跨阻放大器
公开(公告)号：US07332971B2
公开(公告)日：2008-02-19
申请号：US10864950
申请日：2004-06-10
申请人： Uday Dasgupta , Chun Geik Tan
发明人： Uday Dasgupta , Chun Geik Tan
IPC分类号： H03F3/08 , H03F1/36
CPC分类号： H03F3/08
摘要： A Gigabit/s transimpedance amplifier system includes a forward-path amplifier section with a very large bandwidth and an overall frequency-selective feedback section which is active only from DC to low frequencies. The forward-path of the amplifier comprises a regulated cascode for receiving the input signal, a regulated cascode for receiving the feedback signal, a single-ended to differential converter and an output buffer. Stability and frequency selection is achieved by a bandwidth-limited operational amplifier in the feedback path. The Miller multiplication of a capacitive means in the operational amplifier creates a low-frequency pole and stabilizes the feedback loop and thereby limits the frequency range of the feedback.
摘要翻译：千兆/秒跨阻放大器系统包括具有非常大带宽的前向路径放大器部分和仅从DC到低频有效的总频率选择反馈部分。放大器的前向路径包括用于接收输入信号的调节共源共栅，用于接收反馈信号的调节共源共栅，单端到差分转换器和输出缓冲器。稳定性和频率选择由反馈路径中的带宽限制运算放大器实现。运算放大器中的电容装置的米勒乘法器产生低频极点并稳定反馈回路，从而限制反馈的频率范围。

43. 发明授权

US07295061B1 Fully integrated programmable gain chopper amplifier with self DC offset suppression 有权
标题翻译：完全集成的可编程增益斩波放大器，具有自DC偏移抑制功能
公开(公告)号：US07295061B1
公开(公告)日：2007-11-13
申请号：US11115578
申请日：2005-04-26
申请人： Uday Dasgupta
发明人： Uday Dasgupta
IPC分类号： H03F1/02
CPC分类号： H03F3/387 , H03F3/393 , H03F3/45179 , H03F3/45475 , H03F3/45748 , H03F2203/45138 , H03F2203/45212 , H03F2203/45528 , H03F2203/45534
摘要： Chopper amplifiers and methods of amplification are provided. A circuit includes an adjustable modulation resistance network, an amplifier, and an adjustable feedback resistance network. The adjustable modulation resistance network receives and modulates an input signal to produce a modulated signal including varying an input resistance, which includes a switch resistance. The amplifier has an input and an output. The adjustable feedback resistance network varies a feedback resistance, which includes a switch resistance. In addition, a suppression circuit is also included that can produce the feedback signal for preventing the direct current offset signal from substantially affecting the output signal.
摘要翻译：提供了斩波放大器和放大方法。电路包括可调节调制电阻网络，放大器和可调节的反馈电阻网络。可调调制电阻网络接收和调制输入信号以产生包括改变输入电阻的调制信号，其包括开关电阻。放大器有一个输入和一个输出。可调反馈电阻网络改变反馈电阻，其包括开关电阻。此外，还包括抑制电路，其可以产生用于防止直流偏移信号基本上影响输出信号的反馈信号。

44. 发明授权

US6084465A Method for time constant tuning of gm-C filters 失效
标题翻译： gm-C滤波器的时间常数调谐方法
公开(公告)号：US6084465A
公开(公告)日：2000-07-04
申请号：US072341
申请日：1998-05-04
申请人： Uday Dasgupta
发明人： Uday Dasgupta
IPC分类号： H03F3/45 , H03F3/72 , H03K5/00
CPC分类号： H03F3/45735 , H03F3/45188 , H03F3/72 , H03H11/0472 , H03F2203/45356 , H03F2203/45674 , H03F2203/7203
摘要： In this invention a time constant tuning circuit is described in which a reference clock frequency is used to adjust the gm of a transconductor and as a result the time constant of the circuit. This is done by charging a capacitor to a voltage with the current output of a transconductor during a clock period and comparing the voltage charge with another voltage. The error voltage from the comparison is used to control the gm of the transconductor. Changing the clock period changes the gm required to charge the capacitor to a voltage to satisfy the comparison. Thus the filter time constants are directly proportional to the reference clock; and therefore, are independent of process variations. The time constants can be varied by varying the clock frequency and is achieved without the use of a PLL. The output the time constant tuning circuit can be used to tune the time constants of other gm-c filters using similar transconductors and capacitors.
摘要翻译：在本发明中，描述了一种时间常数调谐电路，其中使用参考时钟频率来调节跨导体的gm，结果是电路的时间常数。这通过在时钟周期内将电容器充电到具有跨导体的电流输出的电压来进行，并将电压电荷与另一电压进行比较。来自比较的误差电压用于控制跨导体的gm。改变时钟周期将将电容器充电到电压以满足比较所需的gm。因此，滤波器时间常数与参考时钟成正比; 因此，与工艺变化无关。时间常数可以通过改变时钟频率来改变，并且在不使用PLL的情况下实现。时间常数调谐电路的输出可用于使用类似的跨导体和电容器来调谐其他gm-c滤波器的时间常数。

45. 发明授权

US5900783A Low voltage class AB output stage CMOS operational amplifiers 失效
标题翻译： CMOS运算放大器的低电压等级AB输出级
公开(公告)号：US5900783A
公开(公告)日：1999-05-04
申请号：US905630
申请日：1997-08-04
申请人： Uday Dasgupta
发明人： Uday Dasgupta
IPC分类号： H03F3/30 , H03F3/45 , H03F3/26 , H03F3/16
CPC分类号： H03F3/3022 , H03F3/3001 , H03F3/45192 , H03F2203/30036 , H03F2203/45028 , H03F2203/45182
摘要： A circuit is disclosed for a complimentary metal oxide semiconductor (CMOS) operational amplifier output stage which can be connected easily to almost any input stage design and which can be coupled directly to that input stage. The circuit uses nine small transistors and two output transistors. The output transistors are connected in series between the power supply rails and the size of the two output transistors determines the current available to the load. The circuit of the invention can provide rail-to-rail output voltage swings and can drive a low ohm resistive load.
摘要翻译：公开了一种用于互补金属氧化物半导体（CMOS）运算放大器输出级的电路，其可以容易地连接到几乎任何输入级设计，并且可以直接耦合到该输入级。该电路使用九个小晶体管和两个输出晶体管。输出晶体管串联连接在电源轨道之间，两个输出晶体管的尺寸决定了可用于负载的电流。本发明的电路可以提供轨至轨输出电压摆幅并且可以驱动低欧姆电阻负载。

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