Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Patent
1993-02-22
1995-09-19
Sikes, William L.
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
330296, 330 85, 330293, 330277, H03F 304
Patent
active
054519098
ABSTRACT:
A regulated cascode circuit with enhanced gain includes a cascode section including a common source MOS transistor (m.sub.1) of a first polarity and a cascode device (m.sub.2) wherein the drain of the common-source MOS transistor (m.sub.1) is coupled to the source of the cascode device. An input to the regulated cascode circuit is applied to the common source MOS transistor (m.sub.1) and an output of the regulated cascode circuit is developed at the drain of the cascode device (m.sub.2) across both the common source MOS transistor (m.sub.1) and cascode (m.sub.2) device. A feedback amplifier circuit (10) has its input (12) connected to the drain of the common source MOS transistor (m.sub.1) and its output (20) connected to a gate of the cascode device (m.sub.2) for driving the cascode device (m.sub.2). The feedback amplifier (10) includes a simple five transistor circuit.
REFERENCES:
patent: 4777472 (1988-10-01), Sauer et al.
patent: 5039954 (1991-08-01), Bult et al.
Klaas Bult and Govert J. G. M. Geelen, "A Fast-Settling CMOS Op Amp for SC Circuits with 90-dB DC Gain", IEEE Journal of Solid-State Circuits, vol. 25, No. 6, Dec. 1990, pp. 1379-1384.
Eduard Sackinger and Walter Guggenbuhl, "A High-Swing, High-Impedance MOS Cascode Circuit", IEEE Journal of Solid-State Circuits, vol. 25, No. 1, Feb. 1990, pp. 289-297.
Donaldson Richard L.
Dudek James A.
Hiller William E.
Rutkowski Peter T.
Sikes William L.
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