A Passive Mixer-First Receiver With Digitally Controlled and Widely Tunable RF Interface

@article{Andrews2010APM,
  title={A Passive Mixer-First Receiver With Digitally Controlled and Widely Tunable RF Interface},
  author={Caroline Andrews and Alyosha C. Molnar},
  journal={IEEE Journal of Solid-State Circuits},
  year={2010},
  volume={45},
  pages={2696-2708}
}
A software-defined radio (SDR) receiver with baseband programmable RF bandpass filter (BPF) and complex impedance match is presented. The passive mixer-first architecture used here allows the impedance characteristics of the receiver's baseband circuits to be translated to the RF port of the receiver. Tuning the resistance at the baseband port allows for a real impedance match to the antenna. The addition of "complex feedback" between I and Q paths allows for matching to the imaginary component… CONTINUE READING