Charge domain signal filter

Details Charge domain signal filter Charge domain signal filter

1997-06-11

1999-08-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327558, 36472412, 36472416, G06F 738

Patent

active

059364610

ABSTRACT:
The object of the present invention is to obtain a charge domain signal filter by composing an digital filter circuit with analog/digital mixed circuit and by introducing the analog processing into the process of multiplication and addition consuming the most of the electric power so as to reduce the total power consumption. The present invention is composed of at least one AD converter; at least one reference charge supply unit; a coefficient supply unit for supplying coefficient signals; a plurality of DA converters acting in a charge domain for receiving digital signal outputs supplied from said AD converter and said coefficient signal supply unit, and for performing the multiplication type DA conversion using, as a reference signal, a reference charge packet generated by said reference charge supply unit; and one circuit of analog shift register composed of N stages of charge transfer devices.

REFERENCES:
patent: 5392042 (1995-02-01), Pellon
patent: 5537115 (1996-07-01), Nagazumi
patent: 5539404 (1996-07-01), Nagazumi
patent: 5555200 (1996-09-01), Chiang
patent: 5634067 (1997-05-01), Nagazumi

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