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A double-sampling pseudo-two-path bandpass /spl Delta//spl Sigma/ modulator

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4 Author(s)
Shen-Iuan Liu ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Chien-Hung Kuo ; Ruey-Yuan Tsai ; Jingshown Wu

A double-sampling pseudo-two-path bandpass /spl Delta//spl Sigma/ modulator is proposed. This modulator has an output rate equal to twice the clock rate, uses n/2 operational amplifiers (op-amps) for an nth-older noise transfer function, and has reduced clock feedthrough in the signal path band. The required clocks can be simpler to implement than the conventional pseudo-two-path techniques. The measured signal-to-noise ratio and dynamic range of the fourth-order double-sampling pseudo-two-path bandpass /spl Delta//spl Sigma/ modulator in a 30-kHz bandwidth at a center frequency of 2.5 MHz (at a clock frequency of 5 MHz) are 62 and 68 dB, respectively.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:35 ,  Issue: 2 )