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1. 发明授权

US07298304B2 Innovative method of correlated double sample (CDS) circuit testing 有权
标题翻译：相关双样本（CDS）电路测试的创新方法
公开(公告)号：US07298304B2
公开(公告)日：2007-11-20
申请号：US10294163
申请日：2002-11-14
申请人： Ganesh Kamath , Ravishankar S. Ayyagari
发明人： Ganesh Kamath , Ravishankar S. Ayyagari
IPC分类号： H03M1/10
CPC分类号： H04N17/002
摘要： The present invention comprises a test set-up (20) and method of testing a correlated double sampling circuit (CDS) (24) by using a sinusoidal test signal (22) for measuring linearity. The present invention generates a sinusoidal signal with two accurate and known levels at two different time points, as an input to the CDS. The cosinusoidal output of the CDS is then processed using an ADC (60) and processor (62) to check the functionality and linearity of the CDS circuit under test.
摘要翻译：本发明包括测试装置（20）以及通过使用用于测量线性度的正弦测试信号（22）来测试相关双重采样电路（CDS）（24）的方法。本发明在两个不同的时间点产生具有两个准确和已知电平的正弦信号，作为CDS的输入。然后使用ADC（60）和处理器（62）处理CDS的cosinusoidal输出，以检查被测CDS电路的功能和线性。

2. 发明授权

US07088273B1 Reducing noise in switched capacitor amplifier circuit 有权
标题翻译：降低开关电容放大器电路中的噪声
公开(公告)号：US07088273B1
公开(公告)日：2006-08-08
申请号：US11160855
申请日：2005-07-13
申请人： Sandeep Mallya Perdoor , Visvesvaraya A. Pentakota , Ravishankar S. Ayyagari
发明人： Sandeep Mallya Perdoor , Visvesvaraya A. Pentakota , Ravishankar S. Ayyagari
IPC分类号： H03M1/10
CPC分类号： H03M1/0863 , H03M1/167
摘要： A switched capacitor environment in which a feedback capacitor of a stage is flipped to be used as a sampling capacitor of the next stage. Due to such use of the feedback capacitor, the noise introduced by the stages is substantially reduced. Such switched capacitors can be used in analog to digital converters (ADC).
摘要翻译：一种开关电容器环境，其中翻转级的反馈电容器以用作下一级的采样电容器。由于反馈电容器的使用，这些级引入的噪声显着降低。这种开关电容器可用于模数转换器（ADC）。

3. 发明授权

US06489813B2 Low power comparator comparing differential signals 有权
标题翻译：低功率比较器比较差分信号
公开(公告)号：US06489813B2
公开(公告)日：2002-12-03
申请号：US09794765
申请日：2001-02-26
申请人： Suhas R. Kulhalli , Ravishankar S. Ayyagari
发明人： Suhas R. Kulhalli , Ravishankar S. Ayyagari
IPC分类号： H03K5153
CPC分类号： H03K5/24
摘要： A comparator comparing a differential input signal (represented by INM and INP single ended signals) with a differential reference signal (REFP and REFM) to generate a comparison result. The result may be amplified by a desired high amplification factor while consuming minimal electrical power. The comparator may contain two regenerative latches, with each latch containing two terminals. The INM, INP, REFP, and REFM are provided on the four terminals via respective switches. The first and second terminals of the first regenerative latch may respectively be connected to the first and second terminals of the second regenerative latch, with a switch in the path of each connection. The switches may be operated and the regenerative latches may be enabled for a short duration, to generate an amplified comparison result.
摘要翻译：将差分输入信号（由INM和INP单端信号表示）与差分参考信号（REFP和REFM）进行比较以产生比较结果的比较器。结果可以通过期望的高放大因子放大，同时消耗最小的电功率。比较器可以包含两个再生锁存器，每个锁存器包含两个端子。通过相应的开关在四个端子上提供INM，INP，REFP和REFM。第一再生锁存器的第一和第二端子可以分别连接到第二再生锁存器的第一和第二端子，并且每个连接的路径中都有一个开关。可以操作开关并且可以在短时间内使能再生锁存器，以产生放大的比较结果。

4. 发明授权

US07088149B2 Enhancing SNR and throughput performance of integrated circuits 有权
标题翻译：提高集成电路的SNR和吞吐量性能
公开(公告)号：US07088149B2
公开(公告)日：2006-08-08
申请号：US10724517
申请日：2003-11-29
申请人： Anand Hariraj Udupa , Visvesvaraya A. Pentakota , Shakti Shankar Rath , Gautam Salil Nandi , Vineet Mishra , Ravishankar S. Ayyagari , Nitin Agarwal
发明人： Anand Hariraj Udupa , Visvesvaraya A. Pentakota , Shakti Shankar Rath , Gautam Salil Nandi , Vineet Mishra , Ravishankar S. Ayyagari , Nitin Agarwal
IPC分类号： G11C27/02
CPC分类号： H03F1/26 , H03F3/45188 , H03F3/45475 , H03F3/4565 , H03F3/45937 , H03F3/72
摘要： Low voltage transistors are used in high voltage environment. The low voltage transistors may be used in the path of processing of a signal to increase the throughput performance. By using high voltage supply associated with the high voltage environment, a higher SNR may be attained. Various techniques are implemented to ensure that the low voltage transistors are not damaged by prolonged exposure to high voltages.
摘要翻译：低压晶体管用于高压环境。低电压晶体管可用于处理信号的路径以增加吞吐量性能。通过使用与高压环境相关联的高压电源，可以获得更高的信噪比。实施各种技术以确保低电压晶体管不被长时间暴露于高电压而损坏。

5. 发明授权

US07498862B2 Switch for handling terminal voltages exceeding control voltage 有权
标题翻译：用于处理端子电压超过控制电压的开关
公开(公告)号：US07498862B2
公开(公告)日：2009-03-03
申请号：US11160879
申请日：2005-07-14
申请人： Ravishankar S. Ayyagari
发明人： Ravishankar S. Ayyagari
IPC分类号： H03K17/00
CPC分类号： H03K17/102 , H03K17/6871 , Y10T307/964
摘要： A switch provided between a first terminal and a second terminal with a varying cross terminal voltage. The switch contains two transistors, with the source terminal of the first transistor being coupled to the first terminal and a drain terminal of the second transistor being coupled to the second terminal. The gate terminal of the first transistor is coupled to the first terminal, the gate terminal of the second transistor is coupled to the second terminal, and the drain terminal of the first transistor is coupled to the source terminal of the second transistor. Due to such a topology, the cross-terminal voltage across the first and second terminals can be substantially higher than the voltage of the control signal indicating whether the switch is to be in on or off state.
摘要翻译：设置在具有变化的交叉端电压的第一端子和第二端子之间的开关。开关包含两个晶体管，其中第一晶体管的源极端子耦合到第一端子，并且第二晶体管的漏极端子耦合到第二端子。第一晶体管的栅极端子耦合到第一端子，第二晶体管的栅极端子耦合到第二端子，第一晶体管的漏极端子耦合到第二晶体管的源极端子。由于这样的拓扑结构，跨越第一和第二端子的跨端电压可以显着地高于控制信号的电压，指示开关是开或关状态。

6. 发明授权

US07015850B2 Bandwidth limited sampling circuit of high linearity 有权
标题翻译：带宽限制采样电路线性度高
公开(公告)号：US07015850B2
公开(公告)日：2006-03-21
申请号：US10710620
申请日：2004-07-26
申请人： Ravishankar S. Ayyagari , Visvesvaraya A. Pentakota
发明人： Ravishankar S. Ayyagari , Visvesvaraya A. Pentakota
IPC分类号： H03M1/12
CPC分类号： H04N5/378 , G11C27/026
摘要： A bandwidth limited sampling circuit of high linearity may be implemented by using a first circuit portion to limit the bandwidth of the input signals, and using a second circuit portion to sample the bandwidth limited input signal. The first circuit portion and the second circuit portion may be implemented using separate components. In an alternative embodiment, bandwidth limiting is implemented by taking a difference of a sampled input signal from a sampled high frequency components of the input signal.
摘要翻译：可以通过使用第一电路部分来限制输入信号的带宽并且使用第二电路部分对带宽限制的输入信号进行采样来实现高线性的带宽限制采样电路。第一电路部分和第二电路部分可以使用单独的部件来实现。在替代实施例中，通过从输入信号的采样高频分量中取样输入信号的差异来实现带宽限制。

7. 发明授权

US07358801B2 Reducing noise and/or power consumption in a switched capacitor amplifier sampling a reference voltage 有权
标题翻译：降低开关电容放大器的噪声和/或功耗，对参考电压进行采样
公开(公告)号：US07358801B2
公开(公告)日：2008-04-15
申请号：US11161486
申请日：2005-08-05
申请人： Sandeep Mallya Perdoor , Visvesvaraya A Pentakota , Ravishankar S Ayyagari
发明人： Sandeep Mallya Perdoor , Visvesvaraya A Pentakota , Ravishankar S Ayyagari
IPC分类号： H03F1/02
CPC分类号： H03F1/26 , H03F1/02 , H03F3/005 , H03F3/45475 , H03F3/45973 , H03F2200/294
摘要： Equal common mode voltage is present at the input terminals of an operational amplifier with amplifies the residue signal in a stage of an ADC in two phases while reducing the noise introduced into the amplified signal. A reference capacitor is coupled between an input terminal of the operational amplifier and a reference voltage in a first phase, and between the input terminal and a the reference voltage but with opposite polarity in the second phase.
摘要翻译：在运算放大器的输入端存在相等的共模电压，同时在降低放大信号中引入的噪声的同时放大ADC的一级中的残留信号。参考电容器耦合在运算放大器的输入端和第一相中的参考电压之间，并且在第二相中在输入端和参考电压之间但极性相反。

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