Jittered random sampling with a successive approximation ADC

• Published in: 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) pp. 1798 - 1802
• Main Authors: Luo, Chenchi Eric, Lingchen Zhu
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-05-2014
• Subjects: Approximation methods; discrete jittered random sampling; Jitter; Noise; Quantization (signal); Spectral analysis; successive approximation; Time-frequency analysis; Vectors
• ISSN: 1520-6149; 2379-190X
• DOI: 10.1109/ICASSP.2014.6853908

This paper proposes a randomly jittered temporal sampling scheme with a successive approximation register (SAR) ADC. The sampling time points are jittered around a uniform sampling clock. A control logic is implemented on a traditional SAR ADC to force it to terminate the sample conversion before reaching the full precision at the jittered time points. As a result, variable word length data samples are produced by the SAR converter. Based on a discrete jittered random sampling theory, this paper analyzes the impact of the random jitters and the resulting randomized quantization noise for a class of sparse or compressible signals. A reconstruction algorithm called Successive Sine Matching Pursuit (SSMP) is proposed to recover spectrally sparse signals when sampled by the proposed SAR ADC at a sub-Nyquist rate.