A high performance 0.18 μm CMOS downconversion active mixer

Author

Zhu, Siheng ; Feng, Kun ; Guo, Chao ; Hu, Jun ; Sun, Houjun ; Lv, Xin

Author_Institution

Sch. of Inf. & Electron., Beijing Inst. of Technol., Beijing, China

Volume

1

fYear

2012

fDate

5-8 May 2012

Firstpage

1

Lastpage

4

Abstract

The demanding noise figure (NF) and linearity by direct conversion and low intermediate frequency (IF) architectures make the design of active mixer extremely challenging. According to second order intermodulation and flicker noise mechanisms reviewed in this paper, we find some factors affect both the IIP2 and NF of the Gilbert cell simultaneously. AC coupling is adopted to filter out the low frequency distortion and noise from transconductor stage. A inductor is also used to tune out the parasitic capacitors at switching pair common sources to improve the NF and IIP2. The proposed mixer achieves maximal IIP2 is 72 dBm, SSB noise figure at 100 KHz is 14 dB, IIP3 is 6 dBm and conversion gain is 6 dB with 1 dBm LO, 14.4 mW power dissipation.

Keywords

CMOS integrated circuits; flicker noise; intermodulation; mixers (circuits); CMOS downconversion active mixer; Gilbert cell; direct conversion; flicker noise; frequency 100 kHz; frequency distortion; gain 6 dB; low intermediate frequency; noise figure 14 dB; parasitic capacitors; power 14.4 mW; second order intermodulation; size 0.18 mum; transconductor stage; 1f noise; CMOS integrated circuits; Inductors; Mixers; Noise measurement; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on

Conference_Location

Shenzhen

Print_ISBN

978-1-4673-2184-6

Type

conf

DOI

10.1109/ICMMT.2012.6229982

Filename

6229982