Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1992-04-17
1993-12-28
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341118, H03M 300
Patent
active
052743756
ABSTRACT:
An analog-to-digital converter includes a two-bit delta-sigma modulator. The delta-sigma modulator is comprised of a first stage integrator (10) that feeds a noise shaping circuit (18). The output of the noise shaping circuit (18) is input to a two-threshold imbedded ADC (20) to provide the two-bit output. This output of the imbedded ADC (20) is input to a digital filter (22) to provide the filtered digital output, this filtering high-frequency noise. The output of the imbedded ADC (20) is also fed back through a three-level DAC (24) to a summing junction on the input of the integrator (10). The three-level DAC 24 has three states that are output with one state being a "do nothing" state. The thermal noise performance of the delta-sigma modulator as a function of the quantizer threshold voltages is first simulated and then the value of the quantizer thresholds selected to provide optimum signal-to-thermal noise performance.
REFERENCES:
patent: 4227185 (1980-10-01), Kronlage
patent: 4495591 (1985-01-01), Loomis, Jr.
patent: 4599573 (1986-07-01), Senderowicz
patent: 4887085 (1989-12-01), Moyal
patent: 4896155 (1990-01-01), Craiglow
patent: 4940981 (1990-07-01), Naylor et al.
patent: 4972189 (1990-11-01), Polito et al.
patent: 4972436 (1990-11-01), Halim et al.
patent: 4999632 (1991-03-01), Parks
patent: 5010347 (1991-04-01), Yukawa
patent: 5012178 (1991-04-01), Weiss et al.
patent: 5068659 (1991-11-01), Sakaguchi
patent: 5079550 (1992-01-01), Sooch et al.
patent: 5084702 (1992-01-01), Ribner
patent: 5162801 (1992-11-01), Powell et al.
"Improved Signal-to-Noise Ratio Using Tri-Level Delta-Sigma Modulation" by John J. Paulos, Gregory T. Brauns, Michael B. Steer, Sasan H. Ardalan, IEEE Proc. ISCAS, May 1987, pp. 463-466.
"Design and Implementation of an Audio 18-Bit Analog-to-Digital Converter Using Oversampling Techniques" by Robert W. Adams, J. Audio Eng. Soc., vol. 34, pp. 156-166, Mar. 1986.
"Circuit and Technology Considerations for MOS Delta-Sigma A/D Converters" by Max W. Hauser and Robert W. Brodersen, IEEE Proc. ISCAS '86, pp. 1310-1315, May 1986.
"Multibit Oversampled .SIGMA.-.DELTA. A/D Convertor with Digital Error Correction" by L. E. Larson, T. Cataltepe, and G. C. Temes, Electron. Lett., vol. 24, pp. 1041-1052, Aug. 1988.
"A Noise-Shaping Coder Topology for 15+ Bit Converters" by L. Richard Carley, IEEE J. Solid-State Circuits, vol. SC-24, pp. 267-273, Apr. 1989.
"Adaptive Selfcalibrating Delta-Sigma Modulators" by S. Abdennadher, S. Kiaei, G. Temes and R. Schreier, Electronics Letters, Jul. 2, 1992, vol. 28, No. 14.
"On-Line Adaptive Digital Correction of Dual-Quantisation Delta-Sigma Modulators" by Yaohua Yang, R. Schreier, G. C. Temes and S. Kiaei, Electronics Letters, Jul. 30, 1992, vol. 28, No. 16.
Crystal Semiconductor Corporation
Hoff Marc S.
Howison Gregory M.
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