Title :
A 12 GHz-Bandwidth CMOS Mixer With Variable Conversion Gain Capability
Author :
Xu, Jiangtao ; Saavedra, Carlos E. ; Chen, Guican
Author_Institution :
Sch. of Electron. & Inf., Xi´´an Jiaotong Univ., Xi´´an, China
Abstract :
A broadband downconverter mixer using an operational transconductance amplifier (OTA) in the RF transconductor stage is presented in this paper. By changing the OTA´s transconductance through a dc control voltage, the mixer´s conversion gain is varied. Experimental results show that the mixer´s conversion gain can vary from 17 dB down to 1.2 dB over a 12 GHz bandwidth. The maximum IP1 dB of the mixer is -3.7 dBm and its maximum IIP3 is + 8.6 dBm. Meanwhile, the maximum OP1dB is +7 dBm and the maximum OIP3 is +21 dBm. The circuit consumes a maximum of 5.9 mW of power from a 1.2 V supply. The chip occupies an area of 0.105 mm2 excluding bonding pads.
Keywords :
CMOS integrated circuits; microwave mixers; operational amplifiers; 12 GHz-bandwidth CMOS mixer; OTA transconductance; RF transconductor stage; bonding pads; broadband downconverter mixer; dc control voltage; frequency 12 GHz; mixer conversion gain; noise figure 1.2 dB to 17 dB; operational transconductance amplifier; power 5.9 mW; variable conversion gain capability; voltage 1.2 V; Gain; Gain measurement; Impedance; Mixers; Radio frequency; Switches; Transconductance; Broadband; CMOS; RFIC; high-linearity; mixer; operational transconductance amplifier (OTA); variable conversion gain;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2011.2163387
