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Home / Questions / A crude BJT power amplifier of the class B push-pull type exhibits the VTC of Fig P1 51b T...

A crude BJT power amplifier of the class B push-pull type exhibits the VTC of Fig P1 51b The dead band occurring for 0 7 V v1 0 7 V causes a crossover distortion at the output that can be

A crude BJT power amplifier of the class B (push-pull) type exhibits the VTC of Fig. P1.51b. The dead band occurring for −0.7 V ≤ v1 ≤ +0.7 V causes a crossover distortion at the output that can be reduced by preceding the power stage with a preamplifier stage and then using negative feedback to reduce the dead band. This is shown in Fig. P1.51a for the case of a difference preamplifier with gain a1 and b = 1 V/V. (a) Sketch and label the closed-loop VTC if a1 = 102 V/V. (b) Sketch vI, v1, and vO versus time if vis a 100-Hz triangular wave with peak values of ±1 V.

Aug 06 2020 View more View Less

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