Sigma-delta difference-of-squares RMS-to-DC converter with...

Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder

Reexamination Certificate

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C341S155000

Reexamination Certificate

active

07545302

ABSTRACT:
A sigma-delta difference-of-squares RMS-to-DC converter and method for performing such a conversion in which an analog feedback signal is combined with an analog input signal, following which the combined signals are multiplied to produce an analog product signal that includes at least one signal component corresponding to a difference between a square of the analog feedback signal and a square of the analog input signal. This analog product signal is filtered and digitized to produce a digital output signal to be available for use downstream in or with the host system, with such digital output signal also being converted to the analog feedback signal.

REFERENCES:
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patent: 6204719 (2001-03-01), Gilbert
patent: 6359576 (2002-03-01), Petrofsky
patent: 6549057 (2003-04-01), Gilbert
patent: 6584157 (2003-06-01), Van Der Zwan et al.
patent: 7002394 (2006-02-01), Gilbert
patent: 7197292 (2007-03-01), Kouwenhoven et al.
patent: 2007/0270116 (2007-11-01), Kouwenhoven
Candy, James, “A Use of Limit Cycle Oscillations to Obtain Robust Analog-to-Digital Converters”, IEEE Transactions on Communications, vol. Com-22, No. 3, Mar. 1974, pp. 298-305.
Gilbert, B., “Novel Technique for R.M.S.-D.C. Conversion Based on the Difference of Squares”, Electronics Letters, vol. 11, No. 8, Apr. 17, 1975, pp. 181-182.
Kouwenhoven, M., et al., “A 2GHz Mean-Square Power Detector with Integrated Offset Chopper”, IEEE International Solid-State Circuits Conf., Feb. 2005, pp. 124-125; and 588.
Candy, James, et al., “Delta-Sigma Data Converters, Theory, Design and Simulation”, IEEE Circuits & Systems Society, 1992, pp. 1-35.
Van De Plassche, Rudy, “CMOS Integrated Analog-to-Digital and Digital-to-Analog Converters”, Kluwer Intl. Series in Engineering, 2003, pp. 1-33; 56-75; 416-435.
U.S. Appl. No. 12/048,610, filed Mar. 14, 2008, “Sigma-Delta Difference-of-Squares RMS-to-DC Converter with Forward and Feedback Paths Signal Squaring”, Silva et al.

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