Hybrid tuning circuit for continuous-time sigma-delta...

Details Hybrid tuning circuit for continuous-time sigma-delta... Hybrid tuning circuit for continuous-time sigma-delta...

2006-08-22

2006-08-22

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S144000

Reexamination Certificate

active

07095345

ABSTRACT:
A hybrid tuning circuit is used consisting of a digital finite state machine and an analog tuning circuit to effectively keep the RC product of the continuous time integrator constant across process, temperature, supply, and sampling rate variations. Since the implementation is continuous, the tracking is more accurate than traditional techniques. Using a carefully chosen clocking scheme, the technique gets rid of inter-symbol interference in the feedback DAC. The technique does not use a reference frequency, thereby eliminating the need for a user to identify a reference frequency.

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“An Auto-Tuning Structure For Continuous Time Sigma-Delta Ad Converter And High Precision Filters”; Xia et al.; Analog and Mixed-Signal Center, Dept. of Electrical Engineering, Texas A & M University; 2002, IEEE; pp. 593-596, month unknown.
Walder, J.-P. et al., “A Low Power, Wide Dynamic Range Multi-Gain Signal Processor for the SNAP CCD.” 2003 IEEE Nuclear Science Symposium and Medical Imaging Conference Record, New York, NY, Oct. 19, 2003. vol. 5, pp. 1-5.
Xia, Bo et al., “An Auto-Tuning Structure for Continuous Time Sigma-Delta Ad Converter and High Precision Filters,” IEEE International Symposium in Circuits and Systems, ISCAS 2002, May 29, 2002. vol. 5, pp. 593-596.

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