Low power op-amp circuit with boosted bandwidth

Details Low power op-amp circuit with boosted bandwidth Low power op-amp circuit with boosted bandwidth

1996-12-26

1999-03-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327 65, 327362, 330126, 330151, 330253, 330255, H03F 345, H03F 102

Patent

active

058806270

ABSTRACT:
A low-power op-amp circuit (70) having boosted bandwidth comprises a DC circuit block (72) which is coupled to first (V.sub.DC +, V.sub.DC +, V.sub.AC +) and second (V.sub.DC -, V.sub.AC) input nodes and to an output node (V.sub.OUT) of an output stage (90). The DC circuit block (72) amplifies a differential signal received from the first (V.sub.DC +, V.sub.AC +) and second (V.sub.DC -, V.sub.AC) input nodes, and provides an amplified signal to the output node (V.sub.OUT). An AC circuit block (74) is coupled to the output (NODE 3) of the DC circuit block (72). The AC circuit block (74) is operable to monitor a transient change between the first (V.sub.DC +, V.sub.AC +) and the second (V.sub.DC -, V.sub.AC -) input nodes. The AC circuit block (74) is further operable to transfer charge to the output node (V.sub.OUT) in response to the transient change, thereby providing boosted bandwidth beyond that of the DC circuit block (72) alone.

REFERENCES:
patent: 3573644 (1971-04-01), Evel
patent: 4980651 (1990-12-01), Koullias
patent: 5177451 (1993-01-01), Lehmann
patent: 5200709 (1993-04-01), Saito et al.
patent: 5461342 (1995-10-01), Crabtree
patent: 5625318 (1997-04-01), Sevenhans et al.

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