A methodology to design bulk-driven mixer with harmonic mixing rejection

In this paper, the 'mixing' mechanism of CMOS bulk-driven (BD) mixer is analyzed in detail. Based on the theoretical analysis, a novel method to improve harmonic mixing rejection (HMR) which is important for wideband mixer is proposed. Three BD mixers of different structures are designed in TSMC 65 nm technology to verify this design methodology. Simulation proves that HMR performance is improved for different mixer structures by following the methodology. The broadband HMR is robust under process, temperature, bias and local oscillator amplitude variation without sacrificing other performances. These proposed mixers offer conversion gain above 4.6, -0.5 and 11.0 dB, respectively, covering frequency from 850 MHz to 6 GHz. The simulated IIP3 are 14.51, 16.82 and 4.96 dBm respectively. Power consumptions are 0.96, 1.2 and 0.33 mW respectively under 1 V power supply.