One-bit sigma-delta modulator with improved signal stability

Details One-bit sigma-delta modulator with improved signal stability One-bit sigma-delta modulator with improved signal stability

1992-02-07

1993-01-12

Hoff, Marc

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375 34, H03M 302

Patent

active

051793806

ABSTRACT:
The one-bit sigma-delta modulator with improved signal stability disclosed herein includes, in order, a first anti-aliasing filter (20), a chopper (22), a second anti-aliasing filter (30), and a one-bit modulator (32). The chopper (22) and one-bit modulator (32) are driven by a clock generator (38). The chopper (22) is introduced to provide a carrier upon which the signal may ride, thereby eliminating dc stability problems. The first anti-aliasing filter (20) eliminates aliasing from the chopper (22), and the second anti-aliasing filter (30) eliminates aliasing from the one-bit modulator (32). The second anti-aliasing filter (30) may be eliminated if the frequency of the chopper (22) is an exact integer submultiple of the sampling frequency of the one-bit modulator (32). This invention may drive a decimation filter (36), also driven by the clock generator (38), to provide a low cost analog-to-digital converter.

REFERENCES:
patent: 4829299 (1989-05-01), Mandell
patent: 4940977 (1990-07-01), Mandell
patent: 5027120 (1991-06-01), Thurston
patent: 5039989 (1991-08-01), Welland et al.
patent: 5055843 (1991-10-01), Ferguson, Jr. et al.

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