Switched capacitor filter having a reduced capacitance

Details Switched capacitor filter having a reduced capacitance Switched capacitor filter having a reduced capacitance

1983-01-17

1985-02-05

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

328151, 333172, H03H 1900, H03H 1112

Patent

active

044980639

ABSTRACT:
In a switched capacitor filter of a first-order responsive to a filter input signal for producing a filter output signal by carrying out sampling operation at a predetermined sampling rate by the use of switching circuit, a capacitor, and an integrating circuit, a voltage divider produces a voltage divided signal in response to the filter input signal to reduce a total capacitance determined by capacitances of the capacitor and the integrating circuit. The voltage divided signal is sampled by the switching circuit to be sent to the integrating circuit at the sampling rate through the capacitor. The integrating circuit produces the filter output signal as a result of integration. In addition, an additional switched capacitor filter of a first-order is connected in cascade to the filter to form a switched capacitor filter of a second-order. The additional filter comprises an additional voltage divider for voltage dividing an output signal of the additional filter to deliver an additional voltage divided signal to the filter and the additional filter.

REFERENCES:
patent: 4344050 (1982-08-01), Callahan
Fleischer et al.-"A Family of Active Switched Capacitor Biquad Building Blocks", The Bell System Technical Journal, vol. 58, No. 10, Dec. 1979, pp. 2235-2239.

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