Band-pass ΔΣ D/A converter to up-convert frequency using images for wireless repeater

Abstract

I propose a new architecture of a frequency converting wireless repeater. The architecture consists of an over-sampling interpolator, image-selecting filter, and bandpass delta-sigma digital -to- analog converter (BP∆Σ ∆Σ ∆Σ ∆ΣDAC). The BP ∆Σ ∆Σ ∆Σ ∆ΣDAC has functions both of noise-shaping and waveform equalizing to compensate for the difference between an impulse and a rectangular pulse. The proposed architecture achieves frequency up-converting of an input signal without an oscillator and a mixer; therefore it is effective in reducing the size, production cost, and design turn-around-time of the repeater.