Band-pass sigma-delta converter and commutating filter therefor

Details Band-pass sigma-delta converter and commutating filter therefor Band-pass sigma-delta converter and commutating filter therefor

1996-07-22

1998-06-16

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Differential

375316, 341143, 341165, 36472404, H04B 1406

Patent

active

057683158

ABSTRACT:
A communication receiver (600) utilizes a band-pass sigma-delta converter (100) for receiving a radio signal. The band-pass sigma-delta converter (100) includes a comparator (106) coupled to an adder-filter (101) for making a comparison between a predetermined reference level (110) and an intermediate signal (125), and for generating a comparison result signal (114) responsive to the comparison. A storage element (108) is used for storing the comparison result signal (114) for a predetermined delay period, thereby producing a clocked output signal (118). The adder-filter (101) is coupled to an analog signal (103) and to the clocked output signal (118) for subtracting the clocked output signal (118) from the analog signal (103) to produce a difference signal (120) that is filtered by a commutating filter (400) for generating the intermediate signal (125) responsive to the difference signal (120).

REFERENCES:
"Design CMOS commutative filters with Qs that rival quartz. Important features include variable center frquencies, adjustable bandwidth and good dynamic range.", published on Nov. 8, 1974 by Electronic Design Magazine on pp. 116 to 120.
IEEE 1994 Custom Integrated Circuits Conference, entitled "10.7 MHz Bandpass Delta-Sigma A/D Modulators", published in 1994 by IEEE on pp. 163 to 166, the text of which is incorporated herein by reference.
IEEE 1993 International Solid State Circuit Conference, entitled "A 15b 30kHz Bandpass Sigma-Delta Modulator", published in 1993 by IEEE on pp. 226-227.

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