An improved mixer with high-precision automatic sweet-spot biasing and active-inductor-based harmonic suppression

Author

Hu, Song ; Huang, Yumei ; Hong, Zhiliang

Author_Institution

State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China

fYear

2011

fDate

Nov. 30 2011-Dec. 2 2011

Firstpage

81

Lastpage

84

Abstract

A 930MHz Gilbert mixer with improved linearity and noise figure is presented. To achieve high linearity, the transconductance stage is biased at the sweet spot by a high-precision automatic optimum biasing circuit; and an active-inductor-based series LC network resonating around twice the signal frequency is implemented at the common source nodes of the switch quad to alleviate the second-order interaction effect. The adoption of the active inductor makes this work compact and robust. Noise performance also benefits from the harmonic suppression network. Measurement results show that, the proposed mixer achieves an IIP3 of 12.4dBm and a DSB noise figure of 11.5dB, with a current consumption of 6.7mA from a 1.2V power supply.

Keywords

UHF mixers; circuit noise; harmonics suppression; inductors; Gilbert mixer; active-inductor-based harmonic suppression network; active-inductor-based series LC network resonator; current 6.7 mA; frequency 930 MHz; high-precision automatic optimum sweet-spot biasing circuit; noise figure 11.5 dB; second-order interaction effect; signal frequency; transconductance stage; voltage 1.2 V; Active inductors; Harmonics suppression; Linearity; Mixers; Noise; Transconductance; Transistors; Gilbert mixer; active inductor; harmonic; high precision; linearity; noise; sweet spot;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio-Frequency Integration Technology (RFIT), 2011 IEEE International Symposium on

Conference_Location

Beijing

Print_ISBN

978-1-4577-0517-5

Type

conf

DOI

10.1109/RFIT.2011.6141769

Filename

6141769