Design and Analysis of Harmonic Rejection Mixers With Programmable LO Frequency Travis Forbes, Student Member , IEEE, Wei-Gi Ho, and Ranjit Gharpurey ,S e n i or Member , IEEE

Abstract

A harmonic rejection mixer (HRM) with a pro- grammable local oscillator (LO) frequency is presented. The design allows for the generation of multiple effective LO frequen- cies within a single HRM that are derived from a single primary clock frequency, without any modi fications to the analog signal path. A 16-phase HRM with the pro posed frequency synthesis technique is implemented in a 130-nm CMOS process. A clocking approach within a two-stage HRM is presented, which reduces HRM sensitivity to both gain and phase mismatch. The HRM syn- thesizes eight effective LO frequencies and shows an 11.9-dB gain, 11.2-dB DSB NF, and 5.4-dBm in-band IIP3 in the fundamental mode. Greater than 72-dB HR3, 71-dB HR5, and 67-dB HR7 is achieved over ten IC samples in this mode without calibration or harmonic filtering. Harmonic rejection greater than 61 dB for LO factors 2–6 and 54 dB for LO factor 7 is observed, when modifying the effective LO frequency. The HRM achieves S11 better than 10 dB over 50–830 MHz and has a total power consumption of 67 mW from a 1.2-V supply.