Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2001-03-27
2003-02-25
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000, C330S260000
Reexamination Certificate
active
06525608
ABSTRACT:
FIELD
Embodiments of the present invention relate to analog circuits, and more particularly, to differential amplifiers.
BACKGROUND
A fully differential amplifier provides an output differential signal in response to an input differential signal. A differential signal comprises two signals, where the difference in the two signals contains the relevant information. For example, the input and output differential signals may be voltage signals centered about V
cc
/2, within the range [V
ss
, V
cc
] where V
ss
is a substrate voltage and V
cc
is a power rail (or core) voltage.
Fully differential amplifiers find many applications, such as in sensitive, high-speed analog-to-digital converters employing switched capacitor circuits. Furthermore, it is desirable for differential amplifiers to have large gain-bandwidth products, where CMOS (Complementary-Metal-Oxide-Semiconductor) process technology may be employed.
REFERENCES:
patent: 4958133 (1990-09-01), Bazes
patent: 5442318 (1995-08-01), Badyal et al.
patent: 5703532 (1997-12-01), Shin et al.
patent: 5748040 (1998-05-01), Leung
patent: 6278323 (2001-08-01), Bazes
patent: 2002/0050859 (2002-05-01), Bazes
Kalson Seth Z.
Nguyen Khanh Van
Pascal Robert
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