Biasing Op-Amps into Class A


Posted on Jan 14, 2013

`Class A` refers to configuring an amplifier so that its output devices remain turned on all the time. This reduces thermal variation and eliminates crossover distortion, which makes the chip perform better. To bias an op-amp into class A, you simply put a current source from the op-amp`s output to one of the power rails. Everything else is details. This article is about those details.


Biasing Op-Amps into Class A
Click here to download the full size of the above Circuit.

An ideal current source is any device that will pass a constant amount of current no matter what the voltage drop across it is. Naturally, there is no such thing as an ideal current source, so this article will describe several alternatives of increasing




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

RF Dummy load
Digital-tach-dwell-meter
Audio Schematic Frost Detector Temperature Sensor
mp3-player-booster-circuits.html
BlueTooth Ericofon
arduino Switch transistor with a low voltage and current
markII
Astable multivibrator using op amp negative feedback circuits
Monitoring by the pulse signal constituting the single-shot generating circuit
Suitable for driving the microprocessor power supply LT1587 LT1431S



Top