H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/20
H03F 3/45 (2006.01) H03F 1/34 (2006.01) H03F 1/42 (2006.01) H03F 3/30 (2006.01)
Patent
CA 1143018
SAARI VK 19 Operational AMPLIFIER WITH INCREASED SETTING SPEED ABSTRACT OF THE DISCLOSURE A compact,complementary metal-oxide on silicon integrated circuit operational amplifier having a differential input stage and an output transistor which has its bias current supplied by a complementary current source transistor also includes filter means for coupling signals from the input stage to the gate of the bias transistor. By these means, this normally relatively constant current is increased under certain signal conditions to increase the settling speed.In one form,the filter is a capacitor. In anotner form, it is a parallel combination of a capacitor and a coupling transistor in parallel.The capacitor passes high frequencies, and the resistor passes large amplitude signals.To prevent the signal coupling to the gate from affecting other bias conditions in the circuit, the coupled portion of the gate is isolated from a bias control node by a barrier device which passes only D.C.
371075
Kirby Eades Gale Baker
Western Electric Company Incorporated
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