Digital zero-if selectivity section

Details Digital zero-if selectivity section Digital zero-if selectivity section

H - Electricity

04

B

325/108, 325/47

H04B 1/04 (2006.01) H03C 3/40 (2006.01) H03D 1/22 (2006.01) H03D 7/16 (2006.01) H04B 1/30 (2006.01) H03B 27/00 (2006.01) H03B 28/00 (2006.01)

Patent

CA 1281080

DIGITAL ZERO-IF SELECTIVITY SECTION Abstract A Digital Zero-IF Selectivity Section (DZISS) is disclosed. The DZISS of the present invention teaches a topology that facilitates realization in both transmitters and receivers. In the preferred low-speed embodiment, the digital filter are comprised of cascaded filter sections employing decimation co reduce the data rate. In the preferred high-speed embodiment, the digital filters are more sophisticated as at least the first filter section is decomposed to enable high-speed operation. Decimation is also employed on the high-speed embodiment to allow subsequent circuitry to operate at a lower data rate thus consuming less power. In an alternate embodiment, applicable to the low-speed and high-speed preferred embodiments, sections of the digital lowpass filters are time multiplexed effectuating a cost and space savings.

500739

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