US Patent 7362252 Bandwidth tunable sigma-delta ADC modulator
Patent 7362252 was granted and assigned to MStar Semiconductor on April, 2008 by the United States Patent and Trademark Office.
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A high order continuous-time Sigma-Delta Modulator (ΣΔM) is used for its high carrier-to-noise ratio (CNR) performance and low power consumption. The modulator is designed to allow zero-IF, wide-band low-pass or low-IF flexibility. The sigma-delta ADC modulator includes a receiving circuit, a plurality of loop filter transconductors, a plurality of feedforward weighting amplifiers, a first adding element, at least a local feedback circuit, a quantizer, and a feedback DAC. The local feedback circuit includes a feedback weighting amplifier and a second adding element. The feedback coefficient of the feedback weighting amplifier is tunable, and the local feedback circuits can be designed to maximize bandwidth combination.
US Patent 07362252 Bandwidth tunable sigma-delta ADC modulator US Patent 7362252 Bandwidth tunable sigma-delta ADC modulator
US Patent 07362252 Bandwidth tunable sigma-delta ADC modulator
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