Switched capacitor circuits

Details Switched capacitor circuits Switched capacitor circuits

1983-10-04

1985-07-23

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

307523, 328151, 330 9, H03H 1900, G11C 2702

Patent

active

045311064

ABSTRACT:
A switched capacitor biquadratic filter (10; 20) includes means for dynamically shifting the level of the input voltage (V.sub.B, V.sub.D ; V.sub.X, V.sub.Y,) of the amplifiers (12, 14), so that the need for a level shifting stage in the amplifiers (12; 14) is eliminated. The normally grounded nodes associated with the input ports of the amplifiers (12; 14) are set to a reference voltage (V.sub.B, V.sub.D ; V.sub.X, V.sub.Y) which shifts the inputs to a level appropriate to result in an analog grounded voltage at the outputs of the amplifiers. Internal level shifting stages are thereby eliminated from the amplifiers (12; 14). This gives the filter (10, 20) a broader operating frequency range.
Also disclosed is a particular design for the amplifiers (12, 14) which includes a folded cascode mirror configuration.

REFERENCES:
patent: 4315227 (1982-02-01), Fleischer et al.

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