A Differentially Quantized Bandpass Error Feedback Modulator for ADCs in Digital Radio
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Bandpass sigma delta modulators are highly desirable in precision analog-to-digital conversion applications for narrow-band intermediate frequency signals. This paper describes the design, analysis and implementation of a novel differentially quantized bandpass analog-to-digital conversion technique for digital radio application. A new class of noise-shaping data converter, i.e., the differential quantizer-based error feedback modulator, is introduced, which replaces the integrator/resonator with a differential quantizer to achieve noise-shaping characteristics. Thus, integrator-associated non-idealities, loop stability issues and optimization of the integrator scaling coefficients are no more a concern. Furthermore, a comparison to the conventional bandpass sigma delta analog-to-digital conversion is also been presented here. Behavioral-level simulation results demonstrate the mathematical equivalence of the differential quantizer-based bandpass error feedback modulator technique with bandpass sigma delta modulator technique and confirm its novelty, theoretical stability and scalability to higher order. The circuit-level feasibility, hardware efficiency and power efficiency of the proposed architecture are verified in a 45 nm CMOS process with a 1 V supply. Simulation results show a power consumption of 0.62 and 0.95 mW for the proposed and the conventional architectures, respectively.
KeywordsAnalog-to-digital conversion Quantization Noise shaping Bandpass sigma delta modulator Multi-stage
Mathematics Subject Classification93C57 93B11 94A14
This work was funded by Kerala State Council for Science, Technology and Environment (KSCSTE). Rijo Sebastian was supported by the Government of India through the research fellowship under MANF scheme (Grant No. F1-17.1/2014-15/MANF-CHR-KER-47651).
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