Charge domain signal filter
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United States of America Patent
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Aug 10, 1999
Grant Date -
N/A
app pub date -
Jun 11, 1997
filing date -
Jun 13, 1996
priority date (Note) -
Expired
status (Latency Note)
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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.
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