%0 Journal Article %T L-band SiGe HBT frequency-tunable dual-bandpass or dual-bandstop differential amplifiers using varactor-loaded, stacked LC-resonators %A K. Sakamoto %A Y. Itoh %J Contemporary Engineering Sciences %D 2012 %I %U http://www.m-hikari.com/ces/ces2012/ces9-12-2012/itohCES9-12-2012.pdf