Common mode signal of emitter-coupled differential amplifier circuit a


Posted on Mar 28, 2007

Common mode signal of emitter-coupled differential amplifier circuit a At the input of the circuit is assumed that two equal small increase, of the same polarity signal (referr


Common mode signal of emitter-coupled differential amplifier circuit a
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ed to as common mode signal), as shown in (a), is seven and I will increase at the same time as, where the current flowing through the Ie ICI + ICZ. Thus, e point potential U increases, the current negative feedback to play the role. In other words, common mode input signal existence introduces a strong negative feedback, so that the common-mode magnification greatly reduced and, therefore, reduce the zero- point drift. Figure (b) shows examples of the differential amplifier applications in audio power amplifier circuit. Use two sets of input differential amplifier circuit in the amplifier. Thereby effectively suppressing the generation of zero drift, reducing the influence of noise and interference.




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