The output stage of an operational amplifier on GaAs n-channel
field-effect and GaAs p-n-p bipolar transistors with nonlinear negative
feedback
- Alexey Zhuk ,
- Nikolay Prokopenko ,
- Ilya Pakhomov ,
- Alexey Titov
Abstract
A new circuit of the output stage of an operational amplifier
implemented on GaAs n-channel field-effect transistors with a control
p-n junction and GaAs bipolar p-n-p transistors is investigated. Its
peculiarity consists in the presence of a nonlinear negative feedback
that stabilizes the drain current of the output transistor with an
n-channel at a negative input voltage. The basic equations for the
static mode of the output stage are given. The results of modeling in
the LTspice simulation software of 3 modifications of the proposed
circuit solutions are discussed.