Cmos operational amplifier with reduced power dissipation

Details Cmos operational amplifier with reduced power dissipation Cmos operational amplifier with reduced power dissipation

H - Electricity

03

F

330/20

H03F 3/16 (2006.01) H03F 3/30 (2006.01) H03F 3/45 (2006.01)

Patent

CA 1138054

CMOS OPERATIONAL AMPLIFIER WITH REDUCED POWER DISSIPATION Yusuf A. Haque Abstract of the Disclosure An operational amplifier comprised of MOSFET elements is disclosed which provides for a variable drive for an output stage that results in lower power dissipation and increased gain factor over comparable circuits using constant bias drive for the output stage. A bias section comprised of complementary MOS elements is connected to a single MOSFET that furnishes constant current to the signal input section of a differential amplifier section. The output of this differential amplifier is furnished by one path directly to one complementary MOSFET element of a high impedance output stage and by another path to a level shift section which provides an output to a second comple- mentary MOSFET element of the output stage. Thus, the circuit functions under class A-B operation at low power dissipation and provides high open loop gain. Additional embodiments of the invention utilize three MOSFET elements in the level shift section or an additional output stage having an NPN transistor in combination with an N-channel MOSFET.

361103

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