Regulated BiCMOS output buffer

Details Regulated BiCMOS output buffer Regulated BiCMOS output buffer

1991-09-20

1993-02-02

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307475, 307495, 307570, H03K 19003, H03K 190175, H03F 345

Patent

active

051840332

ABSTRACT:
A regulated BiCMOS output buffer (34) regulates a logic high voltage of an output signal to improve interfacing to loads such as 3.3 volt integrated circuits. The output buffer (34) provides a first voltage to a base of a pullup transistor (116) in response to a difference between an input voltage and a reference voltage. An emitter of the pullup transistor (116) provides an output signal. A second transistor (102) having characteristics matching those of the pullup transistor (116) receives the first voltage at its base, and provides the input voltage at its emitter. The output buffer (34) changes the first voltage until the voltage at the base of the second transistor (102) equals the reference voltage. Thus, signal reflections on the output signal do not affect the performance of the output buffer. Clamps (99, 120) coupled to the base and emitter of the pullup transistor (116) provide soft clamping according to a square law.

REFERENCES:
patent: 4916338 (1990-04-01), Metz
patent: 5023479 (1991-06-01), Jeffrey et al.
patent: 5038058 (1991-08-01), Wang
patent: 5047657 (1991-09-01), Seevinck et al.

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