Effects of Noise and Jitter in Bandpass Sampling

Authors:
Yi-Ran Sun;Svante Signell
Affiliations:
Laboratory of Electronics and Computer System (LECS), Institute of Microelectronics and Information Technology (IMIT), Royal Institute of Technology (KTH), Stockholm, Sweden;Laboratory of Electronics and Computer System (LECS), Institute of Microelectronics and Information Technology (IMIT), Royal Institute of Technology (KTH), Stockholm, Sweden
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2005

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Abstract

BandPass Sampling (BPS) is an undersampling technique by intentional aliasing. BPS enables one to have an interface between the IF stage and the ADC in a radio receiver. Conventional uniform BPS at Nyquist rate normally results in a low Signal-to-Noise Ratio (SNR) due to noise spectrum aliasing. The noise (e.g. kT/C noise introduced in a voltage-mode sampler) is combined in each of the Nyquist bands within the bandwidth of the sampling device. Also timing jitter causes a performance degradation in BPS.In this paper, signal spectrum aliasing, noise aliasing and jitter effects in BPS is analyzed. It is verified by simulation that NonUniform Sampling (NUS) has the potential to suppress signal spectrum aliasing and relax the requirement on the anti-aliasing (AA) filter. Jitter effects in BPS are compared to LowPass Sampling (LPS) case. However, a signal cannot be reconstructed from its nonuniform samples by using only ideal lowpass filtering (classic Shannon's reconstruction). Finally, signal reconstruction in the presence of noise and jitter are investigated for three Reconstruction Algorithms (RAs) aimed at NUS.