Delta-sigma modulators with integral digital low-pass filtering

Details Delta-sigma modulators with integral digital low-pass filtering Delta-sigma modulators with integral digital low-pass filtering

2006-09-19

2006-09-19

Tse, Young T. (Department: 2611)

Pulse or digital communications

Pulse code modulation

Differential

C341S143000

Reexamination Certificate

active

07110460

ABSTRACT:
A delta-sigma modulator of an order of at least three having a signal transfer function defining a signal low-pass response, the signal transfer function has a numerator and a denominator, the denominator defined by a product of first and second functions defining respective first and second pole sets such that a roll-off frequency of a low-pass response defined by the first pole set is at least twice a roll-off frequency of a low-pass response defined by the second pole set. The delta-sigma modulator also has a noise transfer function defining a noise high-pass response, the noise transfer function having a numerator and a denominator, the denominator defined by the product of the first and second functions. The numerator of the noise transfer function differs from the numerator of the signal transfer function and characterizes the noise high-pass response.

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patent: 6396428 (2002-05-01), Cheng
patent: 2004/0190728 (2004-09-01), Melanson
patent: 2004/0193296 (2004-09-01), Melanson

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