Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-10-03
2006-10-03
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
Reexamination Certificate
active
07116172
ABSTRACT:
A circuit topology for gain boosted high-swing folded cascode has been improved to maximize the available dynamic range in applications having low supply voltage requirements. The circuit includes an improved gain boost amplifier that maximizes the available dynamic range for applications having low supply voltage requirements. The improved gain boosting amplifier includes a differential pair of input transistors connected to a current mirror, wherein a pair of current sources supply current to each lead of the current mirror. One lead of the current mirror is level-shifted by a transistor coupled to another current source, wherein the coupling of the transistor and the current source form the output of the amplifier. Effectively, the amplifier consists of a level shifter and a series common-drain, common-gate amplifier. A reduction in transconductance gmfrom the series combination is compensated by a current mirror ratio (K:1) between the level shift and the common-drain, common-gate amplifier.
REFERENCES:
patent: 5365193 (1994-11-01), Zuffada et al.
patent: 6177838 (2001-01-01), Chiu
Brady W. James
Moore J. Dennis
Nguyen Hieu
Pascal Robert
Telecky , Jr. Frederick J.
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