Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1994-10-19
1998-04-28
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327337, 327 45, 327561, 330 9, 333173, 341172, H03K 1100, H03K 500
Patent
active
057450021
ABSTRACT:
A switched capacitance circuit, using a switched operational amplifier structure as an input switch of the switched capacitance, is provided with a new biasing circuit. An additional switched capacitor, switched alternately to power supply and to ground, is connected to the output side of the primary switched capacitor. Precision is retained while ensuring a rail-to-rail dynamic range, without requiring boosted control phases. Special arrangements may be implemented for controlling the amplitude of switching spikes when so required. A fully differential embodiment is also feasible with additional advantages.
REFERENCES:
patent: 4558292 (1985-12-01), Sasaki et al.
patent: 4999634 (1991-03-01), Brazdrum et al.
Steyaert, et al., "Switched-Opamp, a Technique for Realising full CMOS Switched-Capacitor Filters at Very Low Voltages," 1993 ESSCIRC proceedings, pp. 178-181.
A. Baschirotto et al, "Design Strategy for Low-Voltage SC Circuits," Electronics Letters, vol. 30, No. 5, 3 Mar. 1994, pp. 378-380.
Baschirotto Andrea
Castello Rinaldo
Montecchi Federico
Nagari Angelo
Anderson Matthew S.
Callahan Timothy P.
Formby Betty
Groover Robert
Le Dinh T.
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