Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-07-21
1999-08-24
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
307530, H03F 345
Patent
active
059429402
ABSTRACT:
A CMOS differential amplifier uses a first pair of complementary MOSFETs and a second pair of complementary MOSFETs coupled to a power supply (by another pair of MOSFETs) in such a manner as to be self-biasing and have improved channel-length modulation characteristics. An N-type MOSFET couples the first and second complementary MOSFET pairs to ground potential via a first resistor, and a P-type MOSFET couples the first and second complementary MOSFET pairs to a power-supply via a second resistor. The first and second resistors can be provided using non-salicided N-type MOSFET resistors. The third N-type MOSFET preferably has a low-threshold voltage, including a zero-threshold voltage, and the substrates of the P-type MOSFETs in the first and second complementary pairs are further preferably connected to the sources of those MOSFETs in order to reduce body-sensitivity effects.
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Dreps Daniel Mark
Krauter Byron Lee
Masleid Robert Paul
Dillon Andrew J.
England Anthony V.S.
International Business Machines - Corporation
Musgrove Jack V.
Nguyen Khanh Van
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