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：US20040155703A1

公开(公告)日：2004-08-12

申请号：US10765767

申请日：2004-01-26

Applicant: STMicroelectronics S.A.

Inventor： Jean Ravatin ,  Francois Van Zanten

IPC: H03F001/02

CPC classification number: H03H19/004 ,  H03F1/304

Abstract: A circuit for correcting the offset of an amplification and filtering chain having a predetermined gain and cut-off frequency depending on the value of at least one capacitor, comprising: a correction means for subtracting from the chain input a correction signal depending on the value of a programmable digital word; a digital automaton for, in a setting phase, searching, then memorizing one of two consecutive values of the digital word between which the output signal of the chain switches sign, the input signal being canceled during a setting phase; and comprising a means for, during the setting phase, reducing the value of said at least one capacitor with respect to its normal operating value.

Abstract translation: 一种用于根据至少一个电容器的值校正具有预定增益和截止频率的放大和滤波链的偏移的电路，包括：校正装置，用于从链输入中减去校正信号，该校正信号取决于 可编程数字字; 一个数字自动机，用于在设定阶段中搜索，然后存储所述数字字的两个连续值中的一个，所述数字字的输出信号在所述数字字的两个连续值之间，所述输入信号在设定阶段被取消; 并且包括用于在设定阶段期间相对于其正常工作值减小所述至少一个电容器的值的装置。