Lowpass MASH DQEFM for 4G Wireless Receivers

The design and simulation of a lowpass multistage noise shaping (MASH) Differential Quantizer based Error Feedback Modulator (DQEFM) architecture suitable for data conversion in 4G wireless receivers is presented. The DQEFM structure has been incorporated for obtaining benefits like relaxed op-amp requirements and reduced sensitivity to mismatch effects. The performance of the proposed modulator has been evaluated through circuit-level simulations using HSPICE. The circuit-level simulations performed with 45nm CMOS process indicate that the proposed modulator attains a peak Signal to Noise and Distortion Ratio (SNDR) of 58 dB over a bandwidth of 20 MHz while dissipating 5.9 mW of power. The low operating frequency, low power operation and a Figure of Merit (FoM) of 0.23 pJ/conv-step shows the better performance of the proposed lowpass MASH DQEFM architecture.

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