Switched-capacitor interolation filter

Details Switched-capacitor interolation filter Switched-capacitor interolation filter

1980-05-29

1982-05-25

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307497, 307577, 307352, 330107, H03H 1100, H03F 134

Patent

active

043318940

ABSTRACT:
An interpolation or smoothing filter circuit for a switched-capacitor system which transforms the sampled-and-held output signals from a switched-capacitor filter into sampled-and-held signals with a doubled sample rate. The circuit comprises an operational amplifier whose noninverting input lead is connected to a switched capacitor network which receives the sampled-and-held input signals at the normal sample rate. The network includes two separate capacitors controlled by switches operable at two alternating clock phases and connected to provide the desired summation and holding of charges. Feedback leads connected between the amplifier output lead and its noninverting input lead and containing additional capacitors cooperate with the input network to produce an output signal that is sampled-and-held at twice the sample rate of the input signal.

REFERENCES:
patent: 3676784 (1972-07-01), LeComte
patent: 4179665 (1979-12-01), Gregorian
patent: 4210872 (1980-07-01), Gregorian
IEEE Journal of Solid State Circuits, vol. SC12, No. 6, Dec. 1977, pp. 592-599, "Sampled Analog Filtering Using Switched Capacitors as Resistor Equivalents", by Caves et al.

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