Title :
A 1.6GHz Downconverter Mixer in 0.25μm CMOS
Author :
Antunes, F.J. ; Pimenta, T.C. ; Moreno, R.L.
Author_Institution :
Univ. Fed. de Itajuba
Abstract :
This work shows the implementation of a CMOS double balanced mixer based in the Gilbert cell capable of providing high conversion gain and high linearity. The mixer includes a common mode feedback circuit to keep a fixed DC level at the output and to maintain the transistors in the saturation, since the triode operation reduces the conversion gain. It uses inductive source degeneration in the transconductance stage in order to provide impedance matching and to improve the linearity of the circuit. It also incorporates an active balun at the output to convert the differential, or balanced, signal to a single ended termination. The mixer was designed to work with an RF signal of 1.8GHz, an LO of 1.6GHz, thus producing an IF of 200MHz. The circuit presents a conversion gain of 22.5dB and an IIP3 of +2dBm. The single sided band noise figure is 10.9dB, input signal loss of just -35.5dB
Keywords :
CMOS integrated circuits; UHF mixers; baluns; circuit feedback; impedance matching; 1.6 GHz; 1.8 GHz; 10.9 dB; 200 MHz; 22.5 dB; 35.5 dB; CMOS double balanced mixer; Gilbert cell; UHF mixer; common mode feedback circuit; downconverter mixer; impedance matching; Costs; Energy consumption; Feedback circuits; Impedance matching; Linearity; Noise figure; Radio frequency; Signal design; Transceivers; Transconductance; CMOS; Mixer; RF;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342085