Differential amplifier circuit

Details Differential amplifier circuit Differential amplifier circuit

2008-01-08

2008-01-08

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S258000

Reexamination Certificate

active

10944757

ABSTRACT:
The present invention provides a differential amplifier circuit wherein the center voltages of outputs are not affected by a variation in source potential. A node located in the middle point of a resistor connected between complementary output nodes of an amplifying unit is connected to a positive phase input terminal of an operational amplifier. An antiphase input terminal of the operational amplifier is supplied with a reference voltage. The output of the operational amplifier is supplied in common to the gates of load PMOSs connected between a source potential and the two output nodes as a control voltage. Owing to such a feedback circuit, the potential of the node reaches the reference voltage, and the center voltages of complementary output signals are not affected by the source potential and are controlled so as to always take the reference voltage.

REFERENCES:
patent: 6107882 (2000-08-01), Gabara et al.
patent: 6369621 (2002-04-01), Tinsley et al.
patent: 6590980 (2003-07-01), Moraveji
patent: 6617888 (2003-09-01), Volk
patent: 6703899 (2004-03-01), Harberts
patent: 2001-274648 (2001-10-01), None

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