Differential amplifier circuit

Posted on Dec 11, 2010

Differential amplifier stability, zero drift suppression, is a common amplifier. Differential amplifier circuit shown in Figure, by two parameters identical transistors VT1, VT

Differential amplifier circuit
Click here to download the full size of the above Circuit.

2 (both 3DG6) components. Component parameter reference value as shown in FIG. Both circuits form is as follows: 1) When the switch K is connected when O end, put up a typical differential amplifier. Decay is used to adjust the potentiometer RP VT1, VT2 quiescent operating point, so that the input signal Ui o, double-ended output voltage Ue O. RE for the two shared emitter resistor, its differential mode signal number no negative feedback effect, and thus does not affect the differential mode voltage gain, but for the common-mode signal has a strong negative feedback effect can be effectively suppressed zero drift system stable amplifier quiescent point. 2) When the switch K is connected end when constituting a constant current source of the differential amplifier. A constant current source transistor VT3 employed to replace fat emitter resistance RE, the differential amplifier can be further improved co-suppression capability mode signal.

Leave Comment

characters left:

New Circuits



Popular Circuits

Guitar Amplifier
Isolated Telephone Interface
Car 12V to +-20V DC converter
Signal Amplifier with 2N2222
Electronic 10 way Selector Relays
Interfacing Electronic Circuits to Arduinos
Protect IGBTs by Sensing Current Using Optical Isolation Amplifiers
20W bus circuit radio and megaphone
Two-way touch switch 4