Capacitively coupled chopper instrumentation amplifiers and associated methods

• Main Authors: WU JUN, FU DAIHONG, CHEN YUAN
• Format: Patent
• Language: Chinese; English
• Published: 23.09.2022
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY

A capacitive coupling chopping instrumentation amplifier includes: a first chopper; a first gain stage; the capacitance isolation stage is electrically coupled between the input end of the first gain stage and the first chopper; a second gain stage; a second chopper electrically coupled between an output of the first gain stage and an input of the second gain stage; clamping circuitry electrically coupled between the input of the first gain stage and a reference voltage rail; and a controller. The controller is configured to: (a) detect that a change in a first common mode voltage exceeds a threshold, the first common mode voltage being a common mode voltage at the input of the amplifier; and (b) in response to detecting that the change in the first common mode voltage exceeds the threshold, causing the clamp circuitry to clamp the input of the first gain stage to the reference voltage rail. 一种电容耦合式斩波仪表放大器包括：第一斩波器；第一增益级；电容隔离级，电耦合在所述第一增益级的输入端与所述第一斩波器之间；第二增益级；第二斩波器，电耦合在所述第一增益级的输出端与所述第二增益级的输入端之间；钳位电路系统，电耦合在所述第一增