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

1997-12-01

1998-11-24

Vo, Don N.

Pulse or digital communications

Receivers

Interference or noise reduction

341172, 333172, 333173, 327554, H04B 110

Patent

active

058418229

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:
patent: 4392068 (1983-07-01), Welles, II
patent: 4518936 (1985-05-01), Sutphin, Jr.
patent: 4581602 (1986-04-01), Reichart

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