Amplifier with cross-over current control

Details Amplifier with cross-over current control Amplifier with cross-over current control

H - Electricity

03

F

330/16

H03F 3/16 (2006.01) H03F 3/30 (2006.01)

Patent

CA 1147405

RCA 71,510 AMPLIFIER WITH CROSS-OVER CURRENT CONTROL ABSTRACT A complementary field-effect transistor (FET) amplifier with means for controlling peak cross-over current. A substantially constant current is established in the drain-source conduction paths of a pair of reference transistors by degenerative feedback from the conduction paths to the respective gate electrodes thereof; wherein the reference transistors have similar characteristics to the respective amplifier transistors. The resulting sum of the gate-to-source voltages of the reference transistors is used to apply a bias voltage between the gate electrodes of the transistors in the FET amplifier so that the sum of the gate-to-source voltages of the amplifier transistors is equal to the sum of the respective gate-to-source voltages of the reference transistors during the cross-over current condition. Cross-over current is thereby limited to a predetermined value proportional to the substantially constant current established through the reference transistors.

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