Abstract:Distortion due to feedback DAC mismatch is a key limitation in ∆Σ ADCs for wideband wireless communications. This paper presents an efficient frequency-domain mask-based offline mismatch calibration method of both the outer DAC and the inner DACs in a ∆Σ ADC. The test stimulus for the calibration is a two-tone signal near the band edge. To avoid the need for high-performance signal generation, a frequency mask is applied to void the stimulus signal and its phase noise. In this way, the method is robust against… Show more
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