Method and circuit arrangement for the operation of recursive fi

Details Method and circuit arrangement for the operation of recursive fi Method and circuit arrangement for the operation of recursive fi

1979-08-27

1981-08-11

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency or time domain filters and delay lines utilizing...

307221D, 328167, 333173, 357 24, H03H 1704, G11C 2700

Patent

active

042836964

ABSTRACT:
The invention relates to a method for operating recursive filter circuits or analog storage circuits constructed according to the charge coupled device principle and to a circuit arrangement for implementing the method, in which method only each respective second stage a CCD is occupied with a charge representing a sampling value of an analog signal and the respective stages lying between these stages concerned are left empty. Known circuits constructed according to the CCD principle conduct the signal from the output stage of a CCD chain to the input of the CCD loop via an amplifier to which the input signal is supplied at the same time. Thereby, the amplification must very precisely amount to 1. An amplifier of the high stability required for that purpose which is arranged in common with the CCD concerned on a chip cannot be satisfactorily realized. A method is specified by means of the invention in which the amplifier is replaced by modulation of a sampling value with a reference signal and by means of a charge amount corrected in accord with the result of the modulation.

REFERENCES:
patent: 3947698 (1976-03-01), Cheek, Jr. et al.
patent: 4035628 (1977-07-01), Lampe et al.
patent: 4100513 (1978-07-01), Weckler
patent: 4145675 (1979-03-01), Picquendar
Butler et al.--"Practical Considerations for Analog Operation of Bucket-Brigade Circuits", IEEE Journal of Solid-State Circuits, vol. SC-8, No. 2, Apr. 1973; pp. 157-168.
Smith et al.--"Active Bandpass Filtering with Bucket-Brigade Delay Lines", IEEE Journal of Solid-State Circuits, vol. SC-7, No. 5, Oct. 1972; pp. 421-425.

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