公开(公告)号：US20030094999A1

公开(公告)日：2003-05-22

申请号：US10299159

申请日：2002-11-18

Applicant: STMICROELECTRONICS S.A.

Inventor： Francois Van Zanten ,  Marc Sabut ,  Raymond Ribas

IPC: G05F001/10

CPC classification number: G05F3/262

Abstract: A mirroring circuit operating at high frequencies is provided. The mirroring circuit includes a first branch having a first transistor in series with a first resistor, a second branch having a second transistor in series with a second resistor, and a servo circuit for controlling current flowing in the first branch and the second branch. The servo circuit includes a third transistor configured as a diode, a source of the third transistor coupled to a source of the first transistor, a fourth transistor configured as a shift lever, a source of the fourth transistor coupled to ground via a third resistor, a fifth transistor configured as a diode, a source of the fifth transistor coupled to a source of the second transistor, and a sixth transistor configured as a shift lever, a source of the sixth transistor coupled to ground via the third resistor.

Abstract translation: 提供以高频操作的镜像电路。 镜像电路包括具有与第一电阻器串联的第一晶体管的第一分支，具有与第二电阻器串联的第二晶体管的第二分支和用于控制在第一分支和第二分支中流动的电流的伺服电路。 伺服电路包括被配置为二极管的第三晶体管，耦合到第一晶体管的源极的第三晶体管的源极，配置为变换杆的第四晶体管，经由第三电阻器耦合到地的第四晶体管的源极， 配置为二极管的第五晶体管，耦合到第二晶体管的源极的第五晶体管的源极和被配置为变换杆的第六晶体管，第六晶体管的源极经由第三电阻器耦合到地。

公开(公告)号：US20030095209A1

公开(公告)日：2003-05-22

申请号：US10299160

申请日：2002-11-18

Applicant: STMICROELECTRONICS S.A.

Inventor： Francois Van Zanten ,  Marc Sabut ,  Raymond Ribas

IPC: H04N005/14

CPC classification number: H04N5/18

Abstract: An input stage for a video receiver includes a variable gain amplifier, an analog-to-digital converter for sampling a video signal and a digital processing unit for processing digital samples of the video signal. An analog regulating circuit sets an input potential at an input of the variable gain amplifier. A differential architecture is used for the variable gain amplifier and the digital analog converter. A conversion circuit between an input coupling capacitor and the variable gain amplifier allows generating the video signal on two channels in antiphase, which are centered on the common mode voltage. Such differential architecture allows reducing the amplitude of analog signals, which is particularly advantageous in the case of a low voltage supply delivering a few volts. In addition, linearity of the video signal processing is enhanced.

Abstract translation: 用于视频接收机的输入级包括可变增益放大器，用于对视频信号进行采样的模数转换器和用于处理视频信号的数字采样的数字处理单元。 模拟调节电路在可变增益放大器的输入端设置输入电位。 差分架构用于可变增益放大器和数字模拟转换器。 输入耦合电容器和可变增益放大器之间的转换电路允许在以共模为中心的反相中的两个通道上产生视频信号。 这种差分架构允许降低模拟信号的幅度，这在低电压电源传送几伏的情况下是特别有利的。 此外，增强了视频信号处理的线性度。