Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Patent
1994-03-28
1995-11-21
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
327482, 327541, 327563, 330253, 330311, H03F 122, H03F 156
Patent
active
054691044
ABSTRACT:
An active folded cascode includes an amplifier transistor and a source follower transistor configured as a folded cascode with the drain of the amplifier transistor and the source of the follower transistor connected to form a gain node. A feedback transistor has its gate and drain connected to the source and gate of the follower transistor while bias current provided to the drain of the feedback transistor by a current source maintains the gain node at a fixed voltage with respect to a reference voltage. Coupling of the voltage at the gain node to the gate of the source follower transistor by the feedback transistor reduces the effective source impedance of the source follower transistor, providing improved gain and bandwidth properties for the active folded cascode circuit.
REFERENCES:
patent: 4507573 (1985-03-01), Nagano
patent: 4767945 (1988-08-01), Quinn
patent: 4777472 (1988-10-01), Sauer et al.
patent: 4891604 (1990-01-01), Cotreau
patent: 5012201 (1991-04-01), Morita et al.
patent: 5034626 (1991-07-01), Pirez et al.
patent: 5045808 (1991-09-01), Taylor
patent: 5243240 (1993-09-01), Murakami et al.
Bee Edward C.
Smith Douglas S.
Callahan Timothy P.
Elantec, Inc.
Englund Terry L.
Novakoski Leo V.
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