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Signal Acquisition system using TI’s High Resolution SAR Converters

The report illustrates a differentially driven signal fed into TI’s 20 bit SAR ADC. This results in raw data available for data processing. This has zero latency and high linearity.

This TI design illustrate the CW Doppler signal conditioning for an ultrasound machine. The input signal bandwidth up to 100KHz and 128 differential signals from AFEs are summed together in a differential high speed amplifier and digitized with TI SAR ADC.

This presentation also addresses :

An adaptive circuit for adjusting the cut off frequency of anti-aliasing circuit in our explanations.

We also describe the SNR and ENOB of SAR ADC with oversampling and decimation.

We also include the schemes to sum the current outputs of the AFEs into differential amplifiers to include 128 channels.

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