Improved Gilbert mixer with high-precision automatic sweet-spot biasing and activeinductor- based harmonic suppression

Author

Hu, Song ; Huang, Yi-Pai ; Hong, Z.

Author_Institution

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

Volume

48

Issue

1

fYear

2012

Firstpage

33

Lastpage

35

Abstract

A 930 MHz Gilbert mixer with improved linearity and noise figure is proposed and implemented in 0.13 μm CMOS. 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 2f_LO is implemented at the common source nodes of the switch quad. The adoption of the tunable 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 12.4 dBm and a DSB noise figure of 11.5 dB, with a current consumption of 6.7 mA from a 1.2 V supply.

Keywords

CMOS integrated circuits; harmonics; inductors; interference suppression; mixers (circuits); source coding; CMOS; Gilbert mixer; active-inductor-based harmonic suppression; active-inductor-based series LC network; common source nodes; current 6.7 mA; frequency 930 MHz; harmonic suppression network; high linearity; high-precision automatic optimum biasing circuit; high-precision automatic sweet-spot biasing; noise figure; noise figure 11.5 dB; switch quad; transconductance stage; tunable active inductor; voltage 1.2 V;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2011.3034

Filename

6126143