Rail-to-rail-input buffer

Details Rail-to-rail-input buffer Rail-to-rail-input buffer

2007-01-02

2007-01-02

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

10927947

ABSTRACT:
A rail-to-rail-Input Buffer with constant mutual conductance includes a differential input; a first differential stage supplied with a first reference current; a second differential stage supplied with a second reference current; a switching PMOS-transistor which switches through when the input signal is higher than a first threshold voltage to divert the first reference current to a first current mirror circuit; a switching NMOS-transistor which switches through when an input signal is lower than a second threshold voltage to divert the second reference current to a second current mirror circuit; a third differential stage supplied with the mirrored first reference current and replaces the first differential stage when the input signal is higher than the first threshold voltage; and a fourth differential stage supplied with the mirrored second reference current and replaces the second differential stage when the input signal is lower than the second threshold voltage.

REFERENCES:
patent: 4636743 (1987-01-01), Cotreau
patent: 5371474 (1994-12-01), Wassenaar et al.
patent: 5500624 (1996-03-01), Anderson
patent: 5561396 (1996-10-01), Hogervorst et al.
patent: 5574401 (1996-11-01), Spitalny
patent: 5745007 (1998-04-01), Redman-White
patent: 6392485 (2002-05-01), Doi et al.
patent: 6518842 (2003-02-01), Carter et al.
patent: 2001/0052818 (2001-12-01), Suzuki
patent: 2002043871 (2002-02-01), None

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