Multiplexed sigma-delta A/D converter

Details Multiplexed sigma-delta A/D converter Multiplexed sigma-delta A/D converter

1991-01-03

1992-09-22

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

H03M 302

Patent

active

051501201

ABSTRACT:
A sigma-delta analog-to-digital converter employs multiplexed single-loop modulators in parallel and respectively phased time-divided clocks. The parallel modulators have the effect of producing digital output at a high sampling frequency that is a multiple of the phased switching frequencies applied to the modulator circuits. In one preferred embodiment, four second-order sigma-delta modulators are driven in clocked phased sequence and combined by a multiplexor circuit. Another embodiment employs second-order modulators using RC integrators. A further embodiment replaces the multiplexor with an adder when in-phase modulator clocks are used, and the adder also acts as a simple low pass filter.

REFERENCES:
patent: 2949505 (1960-08-01), Kretzmer
patent: 3471648 (1969-10-01), Miller
patent: 3518548 (1970-06-01), Greefkes et al.
patent: 3594509 (1971-07-01), Shimamura
patent: 3745562 (1973-07-01), Rosenbaum
patent: 4951052 (1990-08-01), Jacob et al.
patent: 4968987 (1990-11-01), Naka et al.

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