Method and apparatus for oscillation recovery in a delta-sigma A/D converter
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United States of America Patent
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Mar 26, 2002
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app pub date -
Sep 15, 2000
filing date -
Sep 15, 2000
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Abstract
A method and apparatus for recovering from an unstable oscillating condition in a delta-sigma A/D converter modulator circuit. A modulator circuit is disclosed having integrator stages, each having a first switch across the input terminals of the integrator stage and a second switch across the output terminals of the integrator stage. In another embodiment of the invention, the integrator stage comprises a differentially structured operational amplifier having a first restore switch coupled across the input terminals, a second restore switch across the output terminals, and four disconnect switches, one each coupled between the operational amplifier inputs and ends of the first restore switch and between the operational amplifier outputs and ends of the second restore switch. In operation, an unstable condition detector monitors an output of the A/D modulator circuit and generates a restore signal to the integrator stages upon detection of an unstable condition. Upon receipt of the restore signal, each of the restore switches closes and each of the disconnect switches opens to effectively isolate integrating capacitors for each of the integrator stages from the operational amplifiers of the respective integrator stages.
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