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Published in last 50 years
In this letter, it is found that a second order interpolative bandpass sigma delta modulator can achieve high signal-to-noise ratio even if input signals have lowpass characteristics.
A 4th order bandpass sigma-delta modulator for ultrasound applications is presented. By cascading two second-order identical Gm-C bandpass filters, a 4th-order modulator was designed with high powe...
A digital method of stabilising higher order sigma-delta converters is presented. Results are given for a third order bandpass /spl Sigma//spl Delta/ converter with three continuous time LC filters tuned to 1/4 of clock frequency f/sub c/.