Differential input buffer circuit with rail-to-rail input range

Details Differential input buffer circuit with rail-to-rail input range Differential input buffer circuit with rail-to-rail input range

2007-08-28

2007-08-28

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S052000, C327S065000, C326S068000, C326S081000

Reexamination Certificate

active

11258958

ABSTRACT:
An input buffer circuit achieving rail-to-rail operation maintains a uniform common mode output voltage even though an input signal having any voltage level is inputted. The input buffer circuit has a differential amplifier structure receiving two differential input signals. A first input part has a first inverter circuit into which a first differential input signal is inputted, and a second input part has a second inverter circuit into which the second differential input signal is inputted. The first inverter circuit has a first output node connected to a diode structure having an operating current twice the operating current of the first inverter circuit, and outputs a first output signal. Rail-to-rail operation is achieved, and a common mode output voltage is provided uniformly, with reduced current consumption.

REFERENCES:
patent: 4769564 (1988-09-01), Garde
patent: 4958133 (1990-09-01), Bazes
patent: 5162681 (1992-11-01), Lee
patent: 5311145 (1994-05-01), Huijsing
patent: 6169424 (2001-01-01), Kurd
patent: 6278323 (2001-08-01), Bazes
patent: 6778014 (2004-08-01), Rennig

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