High-order sigma-delta analog-to-digital converter

Details High-order sigma-delta analog-to-digital converter High-order sigma-delta analog-to-digital converter

1990-04-26

1993-03-30

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341166, H03M 732, H03M 150

Patent

active

051988178

ABSTRACT:
A precision sigma-delta analog-to-digital converter disposed to operate at a sampling rate giving rise to a relatively low oversampling ratio is disclosed herein. The high-order sigma-delta analog-to-digital converter (10) of the present invention is operative to convert an analog input signal to a digital output sequence. The inventive converter (10) includes a first integrating network (14) for generating a first sampled analog signal (X.sub.1) in response to the analog input signal. A second integrating network (18) generates a second sampled analog signal (X.sub.2) in response to the first sampled analog signal (X.sub.1). A third integrating network (22) generates a third sampled analog signal (X.sub.3) in response to the second sampled analog signal (X.sub.2). The sigma-delta converter (10) of the present invention further includes an internal quantizer (24) for generating the digital output sequence in response to the third sampled analog signal. A feedback network (28, 30) supplies the first, second and integrating networks (14, 18 and 22) with an analog feedback signal generated in response to the digital output sequence.

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"A 16-bit Oversampling A-to-D Conversion Technology Using Triple-Integration Noise Shaping", Y. Matsuya et al, IEEE J. of Solid-State Circuits, vol. SC22, No. 6, Dec. 1987 pp. 921-929.
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