Title :
A 1V low power 2∼11 GHz direct-conversion mixer for WiMAX system
Author :
Pan, Yan-Cheng ; Lin, Zhi-Ming
Author_Institution :
Grad. Inst. of Integrated Circuit Design, Nat. Changhua Univ. of Educ., Changhua, Taiwan
Abstract :
A fully integrated 2 to 11 GHz CMOS direct-down conversion mixer is proposed in this paper. The proposed mixer utilizes PMOS device to fold transconductance stage and switching stage to achieve low power design for 1V supply voltage. A dam-chain and a gain-enhanced technique are used to reduce power consumption and enhance gain performance, respectively. The proposed mixer achieved 11.3 plusmn 1.5 dB conversion gains for the whole bandwidth with a maximum IIP3 of 7.4 dBm and 20 MHz IF conforming to the WiMAX system. The return losses of all three terminals are less than -10dB after using impedance matching circuit and output buffer for driving a 50 Omega load. The power consumption is only 3.6 mW of the mixer core. The chip is designed by 0.18 mum TSMC CMOS technology with 1.203times1.087 mm2 chip area.
Keywords :
CMOS integrated circuits; WiMax; electric admittance; electric impedance; mixers (circuits); CMOS direct-down conversion mixer; PMOS device; WiMAX system; chip area; conversion gains; dam-chain; frequency 2 GHz to 11 GHz; frequency 20 MHz; gain-enhanced technique; impedance matching circuit; mixer core; output buffer; power 3.6 mW; power consumption; supply voltage; switching stage; transconductance; Bandwidth; CMOS technology; Circuits; Energy consumption; Impedance matching; MOS devices; Performance gain; Transconductance; Voltage; WiMAX;
Conference_Titel :
Circuits and Systems, 2009. MWSCAS '09. 52nd IEEE International Midwest Symposium on
Conference_Location :
Cancun
Print_ISBN :
978-1-4244-4479-3
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2009.5235981
