Analog-to-digital converter (ADC) having integrator dither...

Details Analog-to-digital converter (ADC) having integrator dither... Analog-to-digital converter (ADC) having integrator dither...

2007-06-20

2008-08-12

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C341S143000

Reexamination Certificate

active

07411534

ABSTRACT:
An analog-to-digital converter (ADC) having integrator dither injection and quantizer output compensation reduces the probability of unchanging code sequences that occur when the input signal and feedback signal are equal and thus no quantizer output change occurs. In particular, in modulators that are periodically reset, the dither reduces the probability of a stuck code sequence at startup. The effect of the dither is removed from the output of the ADC, either by subtracting an offset value from the result of filtering the quantizer output, or directly from the quantizer output itself.

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Quinquempoix, et al., “A Low-Power 22-bit Incremental ADC with 4ppm INL, 2ppm Gain Error and 2uV DC Offset”, Proceedings of ESSCIRC, Grenoble, FR 2005.

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