A Fourth-Order Bandpass Δ-Σ Modulator Using Second-Order Bandpass Noise-Shaping Dynamic Element Matching

摘要

A multibit, bandpass Δ-Σ modulator (DSM) using bandpass noise-shaping dynamic element matching (BP-NSDEM) is proposed. The modulator was implemented in a 0.25 μm CMOS technology. It operates at a 2.5 V power supply and achieves a signal-to-noise ratio (SNR) of 77.4 dB over a 250 kHz bandwidth centered at 566 kHz. The experimental results show the feasibility of a high-speed and high-resolution analog-to-digital converter (ADC) which uses a frequency-interleaved technique.