A 63 mA 112/94 dB DR IF Bandpass $\Delta\Sigma$ Modulator With Direct Feed-Forward Compensation and Double Sampling

Abstract

We developed a 10.7 MHz intermediate frequency bandpass discrete-time 4th-order 4-bit DeltaSigma modulator for AM/FM car radio tuners. Using direct feed-forward compensation and double sampling, we have achieved a dynamic range (DR) of 112 dB in the 3 kHz AM bandwidth (BW) and a DR of 94 dB in the 200 kHz FM BW. The modulator occupies 3 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , in 0.15 mum CMOS technology, and draws 63 mA of current.