Distortion in a class-B push-pull amplifier near 0 V, where neither transistor conducts during the handover between positive and negative half-cycles. Class-AB biasing with a small idle current reduces it.
Field: Bipolar transistors
In a class-B push-pull stage, near zero input neither transistor reaches its ~0.6 V VBE, so there is a dead zone where the waveform distorts at the handover—crossover distortion, most noticeable at low volume.
Which distortion tends to occur in a class B push-pull ampl…Class B draws almost no current at idle, reaching about 78.5% (π/4), but suffers crossover distortion at the handover.
Compared with a class A amplifier, which is a characteristi…Common-emitter circuit Current gain (hFE) Current mirror Cutoff region Darlington connection Early effect Emitter follower Forward-active region HBT (heterojunction bipolar transistor) Miller effect