H - Electricity – 03 – F
Patent
H - Electricity
03
F
350/106, 330/14
H03F 3/18 (2006.01) H03F 1/32 (2006.01)
Patent
CA 1044335
ABSTRACT OF THE DISCLOSURE A biasing circuit for a complementary symmetry transistor amplifier utilizing a control transistor is disclosed in which the base terminal of the control transistor is connected to the base terminal of one of the complementary transistors so that the bias current drawn by the amplifier transistors is the control current for the control transistor. A bias voltage establishing network includes one element connected between the emitter and collector terminals of the transis- tor so that the bias voltage is coupled via the emitter- base junction of the control transistor to the complementary transistors and thus the bias current drawn by the com- plementary symmetry amplifier determines the degree of con- duction of the control transistor and therefore the bias voltage applied to the amplifier. In this manner sufficient bias voltage is applied to the amplifier to maintain con- duction to avoid crossover distortion and at the same time the current drawn by the amplifier is limited to prevent thermal runaway.
229462
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