公开(公告)号：US06407630B1

公开(公告)日：2002-06-18

申请号：US09754168

申请日：2001-01-04

申请人： Chi-Tai Yao ,  Wei-Chen Shen ,  Hung-Chih Liu

发明人： Chi-Tai Yao ,  Wei-Chen Shen ,  Hung-Chih Liu

IPC分类号： H03F102

CPC分类号： H03F3/45659 ,  H03F3/45188

摘要： The present invention discloses a DC offset canceling circuit applied in a variable gain amplifier. The DC offset canceling circuit comprises a transconductance amplifier and at least one internal capacitor to function as a filter. The input of the transconductance amplifier is electrically connected to the output of the variable gain amplifier, and the output of the transconductance amplifier and the at least one internal capacitor are electrically connected to the input of the variable gain amplifier to form a feedback loop. To cooperate with the function of the DC offset cancelation, the input stage of the variable gain amplifier comprises an auxiliary differential pair.

摘要翻译： 本发明公开了一种应用在可变增益放大器中的DC偏移消除电路。 DC偏移消除电路包括跨导放大器和用作滤波器的至少一个内部电容器。 跨导放大器的输入电连接到可变增益放大器的输出，并且跨导放大器和至少一个内部电容器的输出电连接到可变增益放大器的输入端以形成反馈回路。 为了配合DC偏移消除的功能，可变增益放大器的输入级包括辅助差分对。

公开(公告)号：US06369732B1

公开(公告)日：2002-04-09

申请号：US09726331

申请日：2000-12-01

申请人： Hung-Chih Liu ,  Wei-Chen Shen

发明人： Hung-Chih Liu ,  Wei-Chen Shen

IPC分类号： H03M136

CPC分类号： H03M1/36 ,  H03M1/0646 ,  H03M1/0682

摘要： The present invention is to provide a low voltage fully differential analog-to-digital converter. The converter consists of an input stage including a plurality of pre-amplifier differential input cells for producing pre-amplified signals, a successive processing stage for receiving pre-amplified signals from the input stages, and a decoder for output converted signals according to the signals from the successive processing stage. Each differential input cell includes first and second differential pre-amplifiers, a bias impedance, and an averaging impedance branch. The first and second differential pre-amplifiers include two transistors, respectively, and differentially amplify a set of input signals. One terminal of the bias impedance is connected to a high supplied voltage while the other terminal of the bias impedance is connected to the first and second output terminals through respective pieces of load bearing impedance in order to adjust output voltages of first and second output terminals. Moreover, the averaging impedance branch includes an impedance connecting the second output terminal and the first output terminal of an adjacent differential input cell and another impedance connecting the other end of the bias impedance and the other end of the bias impedance of the adjacent differential input cell.

摘要翻译： 本发明是提供一种低电压全差分模拟 - 数字转换器。 该转换器包括一个输入级，该输入级包括用于产生预放大信号的多个前置放大器差分输入单元，用于接收来自输入级的预放大信号的连续处理级，以及根据该信号输出转换信号的解码器 从连续的处理阶段。 每个差分输入单元包括第一和第二差分前置放大器，偏置阻抗和平均阻抗分支。 第一和第二差分前置放大器分别包括两个晶体管，差分放大一组输入信号。 偏置阻抗的一个端子连接到高供电电压，而偏置阻抗的另一个端子通过相应的承载阻抗件连接到第一和第二输出端子，以便调节第一和第二输出端子的输出电压。 此外，平均阻抗分支包括连接相邻差分输入单元的第二输出端子和第一输出端子的阻抗，以及连接偏置阻抗的另一端和相邻差分输入单元的偏置阻抗的另一端的另一阻抗 。

公开(公告)号：US5479121A

公开(公告)日：1995-12-26

申请号：US394771

申请日：1995-02-27

申请人： Wei-Chen Shen ,  Yen-Bin Gu ,  Chu-Chang Lin ,  Ming-Jer Chen ,  Po-Chin Hsu ,  Tien-Yu Wu

发明人： Wei-Chen Shen ,  Yen-Bin Gu ,  Chu-Chang Lin ,  Ming-Jer Chen ,  Po-Chin Hsu ,  Tien-Yu Wu

IPC分类号： G11C27/02

CPC分类号： G11C27/026

摘要： This invention deals with the problem of an error voltage in a MOSFET analog switch sample and hold circuit caused by the turn off charge in the MOSFET analog switch. The invention provides a compensating circuit which can be adjusted to exactly compensate for the turn off charge which causes the error so that the error can be reduced to zero or nearly zero. The compensating circuit can be used in both open loop and closed loop sample and hold circuits. The compensating circuit can be used in combination with a Miller feedback circuit for eliminating the error voltage.

摘要翻译： 本发明涉及由MOSFET模拟开关中的关断电荷引起的MOSFET模拟开关采样和保持电路中的误差电压的问题。 本发明提供一种补偿电路，其可被调整以精确地补偿导致误差的关断电荷，使得误差可以降低到零或接近零。 补偿电路可用于开环和闭环采样保持电路。 补偿电路可以与米勒反馈电路组合使用，以消除误差电压。

公开(公告)号：US20060197872A1

公开(公告)日：2006-09-07

申请号：US11255437

申请日：2005-10-19

申请人： Kuan-Yu Chen ,  Yao-Chen Huang ,  Wei-Chen Shen

发明人： Kuan-Yu Chen ,  Yao-Chen Huang ,  Wei-Chen Shen

IPC分类号： H03M1/12

CPC分类号： H03M1/1028 ,  H03M1/1295 ,  H03M1/18

摘要： A method for processing a video signal and a method for calibrating signal processing apparatuses are disclosed. The method for video signal process comprises the following steps. First, an analog video signal having a sync pulse is provided. Then, a peak level of the sync pulse is detected, and a signal transfer gain is determined based on the peak level of the sync pulse. Finally, the analog video signal is converted into a digital signal according to the signal transfer gain.

摘要翻译： 公开了一种用于处理视频信号的方法和用于校准信号处理装置的方法。 视频信号处理方法包括以下步骤。 首先，提供具有同步脉冲的模拟视频信号。 然后，检测同步脉冲的峰值电平，并且基于同步脉冲的峰值电平来确定信号传递增益。 最后，根据信号传递增益将模拟视频信号转换为数字信号。

公开(公告)号：US06750703B1

公开(公告)日：2004-06-15

申请号：US10327473

申请日：2002-12-24

申请人： Wei-Chen Shen ,  Sheng-Yeh Lai

发明人： Wei-Chen Shen ,  Sheng-Yeh Lai

IPC分类号： H03F102

CPC分类号： H03F3/387 ,  H03F3/45977 ,  H03F2200/168 ,  H03F2203/45212 ,  H03G1/0088

摘要： A DC offset canceling circuit. The DC offset canceling circuit applied in a variable gain amplifier includes chopper circuits, a transconductance amplifier, and at least one internal capacitor. The transconductance amplifier and at least one capacitor function as a filter for canceling DC offset of the variable gain amplifier. A first chopper circuit is inserted between the output of the variable gain amplifier and the input of the transconductance amplifier. A second chopper circuit is inserted between the output of the transconductance amplifier and the capacitor. The DC offset and low frequency noise of the transconductance amplifier, the undesired signal, is translated up to a chopping frequency by chopper circuits. The chopping frequency is much higher than the desired signal bandwidth, and the amount of the undesired signal in the passband of the signal is thereby greatly reduced.

摘要翻译： DC偏移消除电路。 施加在可变增益放大器中的DC偏移消除电路包括斩波电路，跨导放大器和至少一个内部电容器。 跨导放大器和至少一个电容器用作用于消除可变增益放大器的DC偏移的滤波器。 在可变增益放大器的输出端和跨导放大器的输入端之间插入第一斩波电路。 第二个斩波电路插在跨导放大器的输出端和电容器之间。 跨导放大器的DC偏移和低频噪声（不需要的信号）由斩波电路转换为斩波频率。 斩波频率远高于期望的信号带宽，从而大大降低了信号通带中的不需要信号的量。