CMOS output stage

Details CMOS output stage CMOS output stage

1990-05-25

1991-10-08

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330264, H03F 326

Patent

active

050557963

ABSTRACT:
A CMOS output amplifier having a symmetrical output and a high ratio of output drive current to quiescent current. The amplifier uses first and second complementary devices connected in series between power supply connections with the output taken from the connection between the two devices. The input to the output stage is provided to the gate of the first device and to the gate of a third device of the same type as the second device, the source of the third device being maintained at a voltage which is independent of the input signal. The current through the third device is mirrored to the second device in a ratio of 1:N. Current sourcing and sinking capabilities of the output stage are an order of magnitude larger than the quiescent current requirements.

REFERENCES:
patent: 4446444 (1984-05-01), Patterson, III

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