Variable-gain dual-output transconductance amplifier-based instrumentation amplifiers

摘要

A variable-gain current conveyor-based instrumentation amplifier without introducing distortion. An exemplary variable-gain instrumentation amplifier includes a first dual-output transconductance amplifier (DOTA) (i.e., current conveyor) that receives a first input voltage, a second DOTA that receives a second input voltage, a first resistive element connected between the first and second DOTA, an amplifier connected to the second DOTA at an inverting input, and a second resistive element that connects the second DOTA and the inverting input to an output of the amplifier. At least one of the resistive elements is a variable resistive element.

主权项

1. A variable-gain instrumentation amplifier comprising:
a first dual-output transconductance amplifier (DOTA) configured to receive a first input voltage; a second DOTA configured to receive a second input voltage; a first resistive element connected between the first and second DOTAs; an amplifier comprising an inverting input, the amplifier being connected to the second DOTA output at the inverting input; and a second resistive element configured to connect the second DOTA and the inverting input to an output of the amplifier, wherein at least one of the resistive elements comprises a variable resistive element, wherein the first resistive element comprises two potentiometers.