Title :
Second-Order Intermodulation in Current-Commutating Passive FET Mixers
Author :
Chehrazi, Saeed ; Mirzaei, Ahmad ; Abidi, Asad A.
Author_Institution :
Marvell Semicond., Santa Clara, CA, USA
Abstract :
Amplitude-modulation detection in the mixer plagues the performance of the zero-intermediate-frequency receiver by downconverting the envelope of amplitude modulated blockers to baseband where the desired channel is after downconversion. Simple equations based on physical mechanisms of second-order intermodulation generation have been derived which can predict the IIP2 of the current-driven passive mixer accurately. Derived equations have been verified by SPECTRE and SPECTRE-RF simulations, and mixer optimization has been explained.
Keywords :
amplitude modulation; field effect transistors; intermodulation; mixers (circuits); optimisation; receivers; IIP2; SPECTRE simulation; SPECTRE-RF simulation; amplitude modulated blockers; amplitude-modulation detection; current-commutating passive FET mixers; current-driven passive mixer; mixer optimization; second-order intermodulation; zero-intermediate-frequency receiver; Amplitude-modulation (AM) detection; IIP2; IM2; envelope detection; passive mixer; second-order nonlinearity;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2009.2016630
