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Heterodyning technique to improve performance of delta-sigma-based beamformers

机译:外差技术可提高基于delta-sigma的波束形成器的性能

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摘要

Delta-sigma (/spl Delta//spl Sigma/) modulators can implement a simpler digital ultrasound beamformer than can traditional architectures based on multi-bit analog-to-digital converters (A/D). The signal-to-noise ratio (SNR) of the /spl Delta//spl Sigma/ modulators, however, suffers from limited oversampling ratios. To improve the SNR of each channel, a mixing signal heterodynes narrowband signals to lower frequencies where the baseband /spl Delta//spl Sigma/ modulator performs better. Noise figure analyses are presented that illustrate the effectiveness of this technique in improving noise performance. Also, spectral Doppler and color flow simulations are presented that realistically emulate a 32 channel oversampled beamformer and compare these results with traditional and ideal systems.
机译:与基于多位模数转换器(A / D)的传统架构相比,Delta-sigma(/ spl Delta // spl Sigma /)调制器可以实现更简单的数字超声波束形成器。但是,/ spl Delta // spl Sigma /调制器的信噪比(SNR)受过采样率的限制。为了提高每个通道的SNR,混合信号将窄带信号外差到较低的频率,其中基带/ spl Delta // spl Sigma /调制器的性能更好。提出了噪声系数分析,以说明该技术在改善噪声性能方面的有效性。此外,还提供了频谱多普勒和彩色流仿真,可以真实地仿真32通道过采样波束形成器,并将这些结果与传统和理想系统进行比较。

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