A Mixer Front End for a Four-Channel Modulated Wideband Converter With 62-dB Blocker Rejection

The modulated wideband converter receiver architecture leverages compressive sensing techniques to improve flexibility for cognitive radio applications. We present a prototype integrated circuit that adds signal reception to previously demonstrated signal detection. By refactoring the mixing sequence between signal detection and reception, we enable targeted reception and blocker rejection. We algorithmically design a three-level mixing sequence and additionally employ delay-based harmonic cancellation. When applied together in our 65-nm proof-of-concept integrated circuit, we measure 62 dB of in-band blocker rejection, while receiving up to four channels with independently defined locations anywhere up to 900 MHz.