Biquad block with switched capacitors without continuous feedbac

Details Biquad block with switched capacitors without continuous feedbac Biquad block with switched capacitors without continuous feedbac

1988-08-19

1989-06-20

Laroche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

328167, 307520, 330 9, 330109, H03H 1900

Patent

active

048412635

ABSTRACT:
The biquad block or cell comprises two operational amplifiers OA1, OA2, eight capacitors C1-C8 and switches comprises switches of reference o and switches of reference e controlled by a clock signal H. The biquad block has six connections P1-P6 and can be used as low-pass, band-pass or high-pass filters, as a function of the connections chosen for the input and output of the signal to be filtered. Switches 46 to 52 make it possible to select one from among several configurations for each filtering function. The different configurations are distinguished by their sensitivities to the gain of the operational amplifiers and to the capacitance ratio. Application to the filtering of signals in the video range (a few megahertz).

REFERENCES:
patent: 4370632 (1983-01-01), Allgood et al.
patent: 4494082 (1985-01-01), Bennett
patent: 4531106 (1985-07-01), Ganesan
patent: 4623854 (1986-11-01), Kuraishi
Said et al., "Stray-free switched-capacitor general biquad blocks", IEE Proceedings, vol. 133, Pt. G. No. 3, June 1986, pp. 154-158.
Mohan et al., "Parasitic--Compensated Single Amplifier . . . SC Biquad", IEEE Transactions on Circuits and Sys. vol. Case-33, No. 4, Apr. 1986, pp. 458-460.
Eriksson et al. "Offset--Compensated Switched-Capacitor Leapfrog filters", Electronics Letters, vol. 20, No. 18, Aug. 30, 1984, pp. 731-733.

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