Decimating filter

Details Decimating filter Decimating filter

H - Electricity

03

H

333/50

H03H 19/00 (2006.01)

Patent

CA 1233890

ABSTRACT A decimating filter utilizing first and second switched input capacitors for sampling an input signal on opposite phases of a first sampling clock signal. The switched input capacitors are connected to an integrating circuit for filtering the sampling signal. An output of the integrating circuit is sampled according to a second sampling clock signal having a frequency equal to a submultiple of the first sampling clock signal frequency. By sampling the input signal on opposite phases, the input signal is effectively sampled at twice the first sampling clock signal frequency. Accordingly, in applications involving high sampling frequencies, such as digital signal transmission, the input signal can be sampled at a sufficiently high frequency without requiring a prohibitively high input sampling clock frequency. The decimating filter is of simple design and can be inexpensively implemented on an integrated circuit chip requiring small area.

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