A low-distortion two-path fourth-order bandpass delta-sigma modulator using horizontal opamp sharing

In this paper, a low-distortion two-path fourth-order bandpass △∑ modulator which has only two opamps is proposed. The proposed modulator is based on both horizontal opamp sharing technique and feedforward topology. It achieves SNDR(signal-to-noise plus distortion ratio) of 80.14dB and DR(dynamic range) of 82dB over 200kHz signal bandwidth centered at 10.03MHz.