Fast fourier transformation-based analog-to-digital...

Details Fast fourier transformation-based analog-to-digital... Fast fourier transformation-based analog-to-digital...

2011-01-04

2011-01-04

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S117000, C341S120000, C341S119000, C341S155000

Reexamination Certificate

active

07864089

ABSTRACT:
The present invention discloses an FFT-based ADC calibration system able to solve the problems of capacitor mismatch and finite Op-Amp open loop gain, which result in that the radix of the gain of each stage is not exactly equal to 2. The present invention uses an FFT processor to calculate the real radix of each stage and uses a digital method to generate new digital outputs. As the present invention can compensate the finite gain of Op-Amp, the specification of Op-Amp is not so critical in designing ADC. Therefore, the low-gain Op-Amp can be used to reduce the power consumption of ADC. Further, the FFT-based calibration technology can considerably promote the performance of ADC.

REFERENCES:
patent: 7289053 (2007-10-01), Bunin
patent: 7355536 (2008-04-01), Dempsey et al.

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