Title :
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
fDate :
Nov. 30 2011-Dec. 2 2011
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;
Conference_Titel :
Radio-Frequency Integration Technology (RFIT), 2011 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4577-0517-5
DOI :
10.1109/RFIT.2011.6141769
