用于160 MHz时钟速率超声成像的带通/spl Sigma//spl Delta/调制器

1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC Pub Date : 1996-02-08 DOI:10.1109/ISSCC.1996.488586

O. Norman

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引用次数: 0

摘要

相控阵超声成像是/spl Sigma//spl Delta/转换器的一个很有前途的应用，在这些转换器中，可以简化整体模拟硬件，以换取增加的数字信号处理(DSP)复杂性。用于此应用的4阶带通调制器在0.8 /spl mu/m BiCMOS中具有以5 MHz为中心的2.5 MHz宽的信号带。为了满足系统级规格，调制器的动态范围为84 dB，通过在160 MHz采样和在调制器中执行24 dB的时间增益控制来实现。噪声整形可分别在b模式(宽带)和cw模式(窄带)扫描的带阻和陷波函数之间进行编程。

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A band pass /spl Sigma//spl Delta/ modulator for ultrasound imaging at 160 MHz clock rate

Phased-array ultrasound imaging is a promising application for /spl Sigma//spl Delta/ converters, where overall analog hardware can be simplified in exchange for increased digital signal processing (DSP) complexity. A 4th-order band-pass modulator for this application in 0.8 /spl mu/m BiCMOS has a 2.5 MHz-wide signal band centered at 5 MHz. To meet system-level specifications, the modulators dynamic range is 84 dB, achieved by sampling at 160 MHz and performing 24 dB of time-gain-control in the modulator. Noise shaping is programmable between band-reject and notch functions for B-mode (wide band) and CW-mode (narrow band) scanning, respectively.

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来源期刊

1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC

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