Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1988-05-31
1989-10-24
Shoop, Jr., William M.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
341123, 341200, H03M 300
Patent
active
048765430
ABSTRACT:
A noise shaping modulator for use in sigma delta modulation data conversion has two or more cascaded quantization loops. A first quantization loop is operated at a first sampling frequency and one or more higher order quantization loops are operated at a second sampling frequency. Due to speed limitations of analog circuitry in the first quantization loop, a significant improvement in signal to noise ratio may be achieved in a sigma delta modulation data converter by selecting the second sampling frequency higher than the first sampling frequency.
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patent: 4439756 (1984-03-01), Shenoi et al.
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"Decimation for Sigma Delta Modulation" by Candy, IEEE Transactions on Communications, Vol. COM-34, No. 1, Jan., 1986.
"A 166 Oversampling A/D Conversion Technology Using Triple Integration Noise Shaping" by Matsuya et al., 1987 IEE International Solid-State Circuits Conference, Digest of Technical Papers, Feb., 25, 1987.
"A Use of Double Integration in Sigma Delta Modulation" by Candy, IEEE Transactions on Communications, Vol. COM-33, No. 3, March, 1985.
"Special Report: High-Resolution Arrives for ADC Chips and Hybrids" by Riezenman, Electronics, Jan. 7, 1988, pp. 133-138.
Crystal Semiconductor Corporation data sheet for CSZ5316, Aug., 1987.
King Robert L.
Motorola Inc.
Shoop Jr. William M.
Young Brian
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