Filter circuit utilizing charge transfer device

Details Filter circuit utilizing charge transfer device Filter circuit utilizing charge transfer device

1980-01-03

1982-02-02

Munson, Gene M.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307255, 307262, 307313, 357 24, 333165, G11C 1928, H03K 1760, H03K 500, H03H 1502

Patent

active

043141625

ABSTRACT:
A filter circuit of the type utilizing a charge-transfer device, such as a bucket brigade device, comprises a clocking signal drive circuit for supplying a clocking signal; a clock signal generator at whose output a clocking control signal is provided; a transistor whose base is connected to the output of the clock signal generator; a plurality of successive capacitive storage stages for sequentially holding a charge level representing a time-sampled input signal, each of the capacitive storage stages having a clocking electrode for receiving the clocking signal so that the charge level is transferred from one to another of the capacitive storage stages in succession, and at least one of the capacitive storage stages being formed of first and second parallel-connected capacitive circuit portions, and the first and second capacitive circuit portions having respective clocking electrodes coupled to the clock signal generator and to the emitter of the transistor, respectively; and a current feedback circuit, such as a current mirror circuit, for detecting the current flowing through the collector of the transistor and applying a corresponding current to a capacitive storage stage in advance of that stage which is coupled to the emitter of the transistor.

REFERENCES:
patent: 3546490 (1970-12-01), Sangster
patent: 3621283 (1971-11-01), Teer et al.
patent: 3651340 (1972-03-01), Cliff
patent: 3798471 (1974-03-01), Williams et al.
patent: 3916219 (1975-10-01), Wilmsmeyer
patent: 3937982 (1976-02-01), Nakajima
patent: 3983408 (1976-09-01), Adam et al.
patent: 3983409 (1976-09-01), Adam

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