Combined and simplified multiplexing and dithered analog to digi

Details Combined and simplified multiplexing and dithered analog to digi Combined and simplified multiplexing and dithered analog to digi

1992-01-07

1993-02-16

Hoff, Marc

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341139, H03M 120

Patent

active

051874814

ABSTRACT:
A circuit for analog-to-digital conversion is disclosed comprising multiplexed ADCs. Dithering is introduced into the circuit before conversion and subtracted out of the resulting digital output stream. Gain control feedback loops are employed to eliminate non-unity gain error of the dither signal and multiplexed ADC differential gain errors. Correlation between the digital output stream and the dither signal is used to detect a non-unity condition and derive gain control feedback. Correlation with the dither signal is also used to detect gain differences between multiplexed ADCs and generate corrective feedback.

REFERENCES:
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Pending U.S. application Ser. No. 07/442,379 of Hilton, filed Nov. 27, 1989 Now U.S. Pat. No. 4,996,530.
Honig, et al., Adaptive Filters, Excerpt from book, Sections 3.1 and 3.2, pp. 48-53, 1985.
Pending U.S. patent application Ser. No. 07/593,441 of Hiller, filed Oct. 5, 1990, Now U.S. Pat. No. 5,134,399.
Pending U.S. patent application Ser. No. 07/883,895 of Hiller, filed May 12, 1992.

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