Coded data generation or conversion – Analog to or from digital conversion – Increasing converter resolution
Patent
1997-09-30
1999-11-23
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Increasing converter resolution
H03M 120
Patent
active
059908157
ABSTRACT:
A dither circuit is monolitically integrated with a subranging ADC to add a dither signal at the input of the ADC's fine quantizer element to randomize its nonlinear quantization level errors. Because the subranging ADC has at least one overlap bit, the amplitude of the dither signal can range up to at least 2.sup.M-1 LSBs of the fine quantizer without saturating it. The digital equivalent of the dither signal is subtracted at the output of the fine quantizer to maintain the ADC's overall SNR. The randomization of only the fine quantizer element avoids gaining up the nonlinear errors associated with the dither signal itself thereby improving the overall SNR. This approach optimizes performance for small input signals while sacrificing flexibility to correct other sources of error.
REFERENCES:
patent: 4550309 (1985-10-01), Hiller et al.
patent: 4896155 (1990-01-01), Craiglow
patent: 5134399 (1992-07-01), Hiller
Analog/Digital Conversion, Analog-to-Digital Converters, pp. 621-622.
What is Dithering?, Hewlett Packard Journal, Dec. 1993, pp. 44-45.
Cheng William W.
Felder Benjamin
Hirata Erick M.
Linder Lloyd F.
Tso Robert
Alkov Leonard A.
Lenzen, Jr. Glenn H.
Raytheon Company
Schubert William C.
Williams Howard L.
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