Buffer amplifier

Details Buffer amplifier Buffer amplifier

2008-04-15

2008-04-15

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000

Reexamination Certificate

active

11438222

ABSTRACT:
A buffer amplifier, which includes a first differential signal amplifier including first and second NMOSFETs (N-type metal-oxide semiconductor field-effect transistors) amplifying differential input signals; a second differential signal amplifier including first and second PMOSFETs (P-type metal-oxide semiconductor field-effect transistors) amplifying the differential input signals; a first feedback resistor including an end commonly connected to drains of the first NMOSFET and the first PMOSFET and the other end commonly connected to gates of the first NMOSFET and the first PMOSFET; a second feedback resistor including an end commonly connected to drains of the second NMOSFET and the second PMOSFET and the other end commonly connected to gates of the second NMOSFET and the second PMOSFET; and a current source providing a bias current for driving the first and second differential signal amplifiers, is provided.

REFERENCES:
patent: 5012137 (1991-04-01), Muellner
patent: 5491441 (1996-02-01), Goetschel et al.
patent: 6020789 (2000-02-01), Wang
patent: 6788142 (2004-09-01), Li et al.
patent: 2007/0253128 (2007-11-01), Tiebout et al.

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