A 1.2V High Linearity Mixer Design
This paper introduces double balance active mixer which is designed by Barrie Gilbert,it shows good characteristics in linearity,gain and isolation.In 1998,Barrie Gilbert present multi-tanh principle with bipolar transistors. So this paper uses the multi-tanh technique to design some new structure in order to improve linearity and gain.First we double the transconductor level with four nmos transistors,then we tripled the transconductor level with six nmos transistors, meanwhile we keep the circuit is symmetry.Using Cadence SpectreRF,the circuits show better linearity and gain,yet noise figure increase,so it exists a tradeoff among these parameters of active mixer.In this paper,the circuit simulated in 2.4GHz down-conversion mixer with 0.18um process,IIP3 and 1dB compression point achieved 8.5dBm and 2dBm,gain is 4 dB,power assumption is 6 mW. Although this new architecture being used in down conversion mixer,it can be applied in up conversion active mixers too.
Mixer high linearity multi-tanh down conversion
Hong Qi Chen Junning Pan Hao Meng Jian
School of Electric Science and Technology,Anhui University,Hefei,Anhui,230039,China
国际会议
西安
英文
2007-08-16（万方平台首次上网日期，不代表论文的发表时间）