A wideband high-resolution time-interleaved sigma-delta modulator with VCO-based quantizer

作者：Zhao Xiao^*; Fang Huajun; Xu Jun

来源：IEICE Electronics Express, 2011, 8(23): 1972-1977.

DOI：10.1587/elex.8.1972

• time-interleaved
• VCO-based quantizer
• sigma-delta modulator

A time-interleaved sigma-delta modulator with VCO-based quantizer for next generation wireless applications is presented. This proposed modulator firstly introduces the VCO-based multibit quantizer into the time-interleaved sigma-delta modulator, which can achieve the improvement of the signal bandwidth and signal-to-noise ratio simultaneously. Moreover, these performance metrics have no adverse effects on power consumption, which is more suitable for wireless applications. A two-channel proposed modulator is taken as an example, and the simulation results show that the proposed modulator achieves a signal-to-noise ratio of 112.1 dB over a 4.7 MHz signal bandwidth with a clock frequency of 300 MHz, which improves 100% in the range of signal bandwidth and 21 dB in the signal-to-noise ratio compared to the conventional sigma-delta modulator with the same clock frequency and power consumption.

• 出版日期2011-12-10
• 单位清华大学