Title :
Impacts of impedance mismatch on the performance of RF mixers
Author_Institution :
ATCO Electr., Calgary, AB, Canada
Abstract :
The impacts of impedance matching on the performance of a radio frequency (RF) front-end mixer are studied. A fully differential double balanced Gilbert cell mixer has been considered in this work. The matching requirements for the low noise amplifier (LNA) and local oscillator (LO) are investigated. A novel solution to use the LNA output capacitors as a matching network is presented. Effects of the layout resistive and capacitive parasitics on the mixer image rejection are highlighted. Creative methods to reduce the impact of the layout parasitic impedances are presented.
Keywords :
UHF amplifiers; UHF integrated circuits; UHF mixers; capacitance; electric resistance; impedance matching; integrated circuit layout; low noise amplifiers; LNA; RF mixer performance; capacitive parasitic; frequency 1.575 GHz; fully differential double balanced Gilbert cell mixer; impedance matching; impedance mismatch; layout parasitic impedance; local oscillator; low noise amplifier; mixer image rejection; output capacitor; radio frequency front end mixer; resistive parasitic; Capacitors; Impedance; Impedance matching; Layout; Mixers; Noise figure; Radio frequency; Image Rejection; Impedance Matching; Layout Parasitic; RF Mixer Inputs Matching;
Conference_Titel :
Wireless Technology and Applications (ISWTA), 2011 IEEE Symposium on
Conference_Location :
Langkawi
Print_ISBN :
978-1-4577-1496-2
DOI :
10.1109/ISWTA.2011.6089546
