A tunable bandpass /spl Delta//spl Sigma/ modulator using double sampling

A tunable switched-capacitor (SC) bandpass delta sigma (/spl Delta//spl Sigma/) modulator using double sampling by one input parameter is proposed. The center frequency of the modulator can be varied from fs/14 to 6fs/14 at a sampling frequency (fs) of 70 MHz. Its performance can be hence improved by fine tuning the center frequency. The purposed modulator was implemented in 0.35-/spl mu/m 2P4M CMOS standard technology with the core area of 4.2 mm/sup 2/. The measured dynamic range of 68 dB within 200 kHz bandwidth can be achieved. Its power consumption is 58 mW under a 3.3-V supply voltage.

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