Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-05-13
1998-10-20
Pascal, Robert J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330311, H03F 345
Patent
active
058252452
ABSTRACT:
A compound cascode amplifier comprising first and second FET input transistors, the gates of which are coupled to a differential input, and first and second FET cascode transistors. The sources of the first and second cascode transistors are coupled respectively to the drains of the first and second input transistors. The gate of the first cascode transistor is coupled to a reference voltage V Ref. The drain of the first cascode transistor is coupled to the gate of the second cascode transistor, and the drain of the second cascode transistor forms the output of the circuit. In operation the drive to the gate of the second cascode transistor arrives in synchronization with the drive to the source thereof, such that the drive to the gate arrives in anticipation of a voltage swing at the output of the second cascode transistor amplifier, not in reaction to it. Accordingly, this arrangement does not introduce a delay or an additional pole in the frequency response of the circuit. A more detailed embodiment of the compound cascode amplifier further includes first and second complementary FET input transistors, and first and second complementary FET cascode transistors.
REFERENCES:
patent: 4797631 (1989-01-01), Hsu et al.
patent: 4937476 (1990-06-01), Bazes
patent: 5323121 (1994-06-01), Butler
patent: 5337008 (1994-08-01), Badyal
patent: 5420540 (1995-05-01), Butler
Michail Michel S.
Pricer Wilbur David
International Business Machines - Corporation
Nguyen Khanh Van
Pascal Robert J.
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