Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1988-01-28
1989-08-15
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341200, 375 26, 375 27, H03M 300
Patent
active
048579289
ABSTRACT:
An improved apparatus and method for a sigma delta converter for bandpass signals is disclosed, suitable for use in mobile radio applications, between the front end and digital signal processing stages, that includes at least one bandpass filter, an n-level quantizer, an n-level digital-to-analog (D/A) converter, and a direct current (DC) feedback network. The sigma delta converter for bandpass signals may be configured in a second order or a fourth order embodiment and achieves analog-to-digital conversion of a signal having a non-zero frequency carrier or suppressed carrier with improved signal-to-noise ratio performance and with minimal quantization error. As a result, the sigma delta conversion occures earlier in a receiver chain and a dynamic range of about 95-98 dB is achieved.
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A Use of Double Integration in Sigma Delta Modulation, James C. Candy, IEEE Transactions on Communications, Mar. 1985, pp. 249-258.
Gailus Paul H.
Turney William J.
Yester, Jr. Francis R.
Egan Wayne J.
Motorola Inc.
Shoop Jr. William M.
Wesoloski Ronald G.
Young Brian
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