公开(公告)号：US07176985B2

公开(公告)日：2007-02-13

申请号：US10457654

申请日：2003-06-09

申请人： Feng Ying ,  Erkan Bilhan ,  Haydar Bilhan ,  James E. Nave

发明人： Feng Ying ,  Erkan Bilhan ,  Haydar Bilhan ,  James E. Nave

IPC分类号： H04N5/18 ,  H04N5/16

CPC分类号： H04N5/185

摘要： An apparatus, system and method for clamping a video signal input to a coupling capacitor (215) for providing a clamping voltage. A charging current is applied to the capacitor (215) via an amplifier (225) having a first input (227) coupled with the capacitor output and a second input (226) coupled to a reference potential, the amplifier (225) is responsive to the capacitor output signal and the reference potential for providing the charging current to the capacitor (215). The current has a linearly varying magnitude which is proportional to a difference between the capacitor output and the reference potential.

摘要翻译： 一种用于钳位输入到耦合电容器（215）的视频信号以提供钳位电压的装置，系统和方法。 经由具有与电容器输出耦合的第一输入（227）和耦合到参考电位的第二输入（226）的放大器（225）将充电电流施加到电容器（215），放大器（225）响应于 电容器输出信号和用于向电容器（215）提供充电电流的参考电位。 电流具有与电容器输出和参考电位之间的差成比例的线性变化幅度。

公开(公告)号：US07023497B2

公开(公告)日：2006-04-04

申请号：US10210473

申请日：2002-07-31

申请人： Lieyi Fang ,  Haydar Bilhan ,  Gonggui Xu ,  Ramesh Chandrasekaran ,  Feng Ying ,  Erkan Bilhan ,  Jason Meiners

发明人： Lieyi Fang ,  Haydar Bilhan ,  Gonggui Xu ,  Ramesh Chandrasekaran ,  Feng Ying ,  Erkan Bilhan ,  Jason Meiners

IPC分类号： H04N5/16

CPC分类号： H04N5/185 ,  H04N5/18

摘要： A clamping circuit disclosed herein has two modes of operation which include both a bottom level and mid-level clamping mode for clamping automatically onto the sync tip of a video signal and customizably clamping onto the front porch, back porch/pedestal or anywhere within the signal. The clamping circuit (400) includes a clamping capacitor (404) that couples to an automatic clamping circuit portion (405) to automatically clamp the synchronization pulse of the video input signal to a first predetermined reference voltage (Vref1) of a first clamping pulse signal during an automatic clamping mode of operation. The automatic clamping portion (405) connects to the customizable clamping circuit portion (411) to clamp any portion of the video input signal to a second predetermined reference voltage (Vref2) of a second clamping pulse signal during a customizable clamping mode of operation. A buffer (416) connects between the customizable clamping circuit portion and the output node of the clamping circuit.

摘要翻译： 本文公开的钳位电路具有两种操作模式，其包括底部电平和中间级钳位模式，用于自动钳位在视频信号的同步端上，并可自定义地夹紧在前沿，后沿/基座或信号内的任何地方 。 钳位电路（400）包括钳位电容器（404），其耦合到自动钳位电路部分（405）以自动将视频输入信号的同步脉冲钳位到第一预定参考电压（V SUB ref1 ）在自动钳位操作模式期间的第一钳位脉冲信号。 自动夹紧部分（405）连接到可定制的钳位电路部分（411），以将视频输入信号的任何部分钳位到第二钳位脉冲信号的第二预定参考电压（V SUB ref2