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

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

1990-04-06

1991-11-12

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341166, H03M 302

Patent

active

050651579

ABSTRACT:
An improved high order interpolative oversampled (sigma delta) analog-to-digital converter network including a plurality of cascade-coupled integrator stages is formed on a single integrated circuit chip in a manner that conserves power and chip area. Each integrator stage includes a differential amplifier, at least one input capacitor and at least one feedback capacitor. The power dissipation and occupied chip area are minimized by down-sizing the chip area occupied by the capacitors and differential amplifiers (op amps) in all but the first integrator stage. The high gain of the first integrator stage makes the noise contribution of subsequent integrator stages negligible so that the higher noise of the subsequent integrator stages is tolerable.

REFERENCES:
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patent: 4704600 (1987-11-01), Uchimura et al.
patent: 4876542 (1989-10-01), Van Bavel et al.
patent: 4896156 (1990-01-01), Garverick
T. Hayashi et al., "A Multistage Delta-Sigma Modulator Without Double Integrator Loop", Proc. IEEE 1986 Int. Solid-State Circuits Conf., pp. 182-183, Feb. 1986.
Y. Matsuya et al., "A 16-Bit Oversampling A-D Conversion Technology Using Triple Integration Noise Shaping", IEEE J. Solid-State Circuits, vol. SC-22, No. 6, pp. 921-929, Dec. 1987.
L. Longo et al., "A 13-Bit ISDN-Band ADC Using Two-Stage Third Ordcer Noise Shaping", Proc. 1988 Custom Integrated Circuit Conf., pp. 21.2.1-21.2.4, Jun. 1988.
R. Gregorian, "Analog MOS Integrated Circuits for Signal Processing", pp. 500-504, Wiley, New York, 1986.
R. Norsworthy et al., "A 13 Bit Sigma-Delta A/D Convertor for ISDN", Proc. IEEE Custom Integrated Circuits Conf., pp. 21.3.1-21.3.4, May 1988.
R. Gregorian, "Analog MOS Integrated Circuits for Signal Processing", pp. 277-280, Wiley, New York, 1986.
M. Hauser et al., "Circuit and Technology Considerations for MOS Delta-Sigma A/D Converters", IEEE 1986 Int. Symposium on Circuits and Systems Proceedings, pp. 1310-1315, May 1986.

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