Low power buffer circuit and method for generating a common-mode

Details Low power buffer circuit and method for generating a common-mode Low power buffer circuit and method for generating a common-mode

1997-12-12

2000-08-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327307, 330258, 326 82, H03F 345, H03K 190185

Patent

active

06107859&

ABSTRACT:
A buffer circuit or output driver can produce a common-mode output and maintain fully differential input signals to the buffer. The common-mode output is derived by shifting the input voltages to the buffer by a threshold amount, averaging the shifted input voltages through a resistor divider, then again-shifting the resulting voltage to an output node of the buffer. The voltages at which the first and second shifts occur are equal but in opposite direction. Accordingly, the output voltage is at a midscale, average or common-mode voltage of the input voltages applied to the buffer. The output voltage has sufficient swing head room and is well suited for low power applications. The buffer circuit utilizes relatively few transistors and only two major current paths from the power supply to ground. Accordingly, the buffer consumes relatively low amounts of power. All of the critical transistors within the buffer are of the same doping type, concentration and implant profile to assure the upward and downward shifts are substantially equal based on the threshold voltages of the critical transistors.

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patent: 5446400 (1995-08-01), Nogle
patent: 5856757 (1999-01-01), Eschauzier
patent: 5898341 (1999-04-01), Miyashita
patent: 5939904 (1999-08-01), Fetterman et al.
patent: 5969545 (1999-10-01), Assadian et al.

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