Complex type sigma-delta analog to digital conversion unit...

Details Complex type sigma-delta analog to digital conversion unit... Complex type sigma-delta analog to digital conversion unit...

2006-10-03

2006-10-03

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07116254

ABSTRACT:
There is provided a complex type sigma-delta analog to digital conversion unit that includes: a first subtractor; a first filter; a first analog to digital converter; a first digital to analog converter; a first sign controller; a second subtractor; a second filter; a second analog to digital converter; a second digital to analog converter; and a second sign controller, wherein the first sign controller inverts a positive
egative sign of an output signal of the first filter in response to a control signal and outputs it to the second filter, and the second sign controller inverts a positive
egative sign of an output signal of the second filter in response to the control signal and outputs it to the first filter.

REFERENCES:
patent: 5764171 (1998-06-01), Stikvoort
patent: 6674381 (2004-01-01), Gomez et al.
patent: 6940436 (2005-09-01), Hezar et al.
patent: 2003-527795 (2003-09-01), None
patent: WO 01/45338 (2001-06-01), None

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