Output buffer circuit with switchable common mode output level

Details Output buffer circuit with switchable common mode output level Output buffer circuit with switchable common mode output level

1999-05-04

2000-12-26

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327109, 327112, 327530, 326 26, 326 27, 326 81, 330252, 330310, H03B 100, H03K 300

Patent

active

061665703

ABSTRACT:
The present invention concerns an output buffer circuit with a switchable common mode output voltage level. An output buffer circuit according to the invention comprises a plurality of output stages (1,2) for driving a symmetrical transmission line (RT). A power supply circuit (U1,U2) provides an upper power supply potential (Vbh) and a lower power supply potential (Vbl) for the output stages (1,2). The power supply circuit is adapted to provide the lower power supply potential (Vbl) at different levels in accordance with a configuration signal (En). Depending on the configured lower power supply potential (Vbl) of the output stages (1,2) at least one of the output stages is activated or inactivated in order to compensate the effect of the lower power supply potential (Vbl) on the output impedance of the output stages (1,2).

REFERENCES:
patent: 5298800 (1994-03-01), Dunlop et al.
patent: 5508570 (1996-04-01), Laber et al.
patent: 5557238 (1996-09-01), Weiss
patent: 5608352 (1997-03-01), Itakura
patent: 5864254 (1999-01-01), Tashiro
patent: 5955918 (1999-09-01), Uno
patent: 5963047 (1999-10-01), Kwong et al.

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