A band-pass delta-sigma modulator for ultrasound imaging at 160 MHz clock rate
暂无分享,去创建一个
A fourth-order band-pass delta-sigma modulator for ultrasound imaging is described. It is implemented in a 0.8-/spl mu/m BiCMOS process using switched capacitors. The signal band is centered at 5 MHz and is 2.5 MHz wide, where the modulator's dynamic range is 84 dB at a sampling rate of 160 MHz. Noise shaping can be programmed between band-reject and notch functions for B-mode (wide band) and CW-mode (narrow band) scanning, respectively.
[1] S. Jantzi,et al. A fourth-order bandpass sigma-delta modulator , 1993 .
[2] S. Norsworthy. Effective dithering of sigma-delta modulators , 1992, [Proceedings] 1992 IEEE International Symposium on Circuits and Systems.