High impedance output driver stage and method therefor

Details High impedance output driver stage and method therefor High impedance output driver stage and method therefor

1992-10-26

1994-05-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including d.c. feedback bias control for stabilization

330291, 330293, H03F 134

Patent

active

053111478

ABSTRACT:
A high impedance output driver stage (16) for reducing loading on a gain stage (18) which drives an output stage (19). The output stage (19) is responsive to an input current. A current sense circuit (21) senses current of output stage (19). The current sense circuit (21) outputs a current proportional to the current sensed in the output stage (19). A current source circuit (22) is responsive to the current output by the current sense circuit (21) and outputs a current substantially equal to the input current of the output stage (19) thereby reducing loading on the gain stage (18).

REFERENCES:
patent: 3717821 (1973-02-01), Amemiya et al.
patent: 3845405 (1974-10-01), Leidich
patent: 4123722 (1978-10-01), Cubbison, Jr.
patent: 4263562 (1981-04-01), Seiler
patent: 5179356 (1993-01-01), Kroner

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