Push-pull output stage

Details Push-pull output stage Push-pull output stage

H - Electricity

03

F

330/15

H03F 3/26 (2006.01) H03F 3/30 (2006.01)

Patent

CA 1165827

PHN 9748 18 ABSTRACT: The invention provides an improved class-B push-pull output stage comprising a first and a second output transistor of a first conductivity type, which stage is provided with a control loop for driving the second transistor in phase opposition as a function of the drive of the first transistor. The control loop is adapted so that a stable quiescent-current setting is obtained and that the effect of poor high-frequency properties of a third transistor of a conductivity type opposite to the first conductivity type, which transis- tor is necessarily included in the control loop, is eliminated, so that a wide frequency range is obtained. Furthermore, steps are taken to guarantee a constant high input impedance.

378020

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