A Continuous-Time Delta-Sigma Modulator for Biomedical Ultrasound Beamformer Using Digital ELD Compensation and FIR Feedback Public Deposited

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  • This paper presents the design of a continuous-time ΔΣ modulator (CTDSM) to be used in an ultrasound beamformer for biomedical imaging. To achieve better resolution, the prototype modulator operates at 1.2 GHz. It incorporates a digital excess loop delay (ELD) compensation to replace the active adder in front of the internal quantizer. A digitally controlled reference-switching matrix, combined with the data-weighted averaging (DWA) technique, results in a delay-free feedback path. A multi-bit FIR feedback DAC, along with its compensation path, is used to achieve lower clock jitter sensitivity and better loop filter linearity. The modulator achieves 79.4 dB dynamic range, 77.3 dB SNR and 74.3 dB SNDR over a 15 MHz signal bandwidth. Fabricated in a 65 nm CMOS process, the core modulator occupies an area of only 0.16 mm² and dissipates 6.96 mW from a 1 V supply. A 58.6 fJ/conversion-step figure of merit is achieved.
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  • Zhang, Y., Chen, C. H., He, T., & Temes, G. C. (2015). A Continuous-Time Delta-Sigma Modulator for Biomedical Ultrasound Beamformer Using Digital ELD Compensation and FIR Feedback. IEEE Transactions on Circuits and Systems I: Regular Papers, 62(7), 1689-1698. doi:10.1109/TCSI.2015.2434100
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  • description.provenance : Made available in DSpace on 2016-01-06T00:45:46Z (GMT). No. of bitstreams: 1 ZhangYiElectricalEngineeringComputerScienceContinuousTimeDeltaSigmaModulator.pdf: 1407914 bytes, checksum: 37d6ed33f82f36cc1ba7ddab432483d5 (MD5) Previous issue date: 2015-07
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