Title :
Effect of out-of-band terminations on intermodulation distortion in common-emitter circuits
Author :
Aparin, V. ; Persico, C.
Author_Institution :
QUALCOMM Inc., San Diego, CA, USA
Abstract :
This paper presents the results of Volterra series analysis of the third-order intermodulation distortion in common-emitter circuits. The derived closed-form expression shows how out-of-band source and load impedances affect the distortion. The expression was used to optimally tune the input matching network of a 2 GHz Si BJT LNA at the sub- and second-harmonic frequencies for a higher IIP/sub 3/. While the in-band noise figure, gain and input return loss were not affected, the peak IIP/sub 3/ increased by 14 dB.
Keywords :
UHF amplifiers; Volterra series; bipolar transistor circuits; circuit tuning; equivalent circuits; harmonics; impedance matching; intermodulation distortion; nonlinear network analysis; 2 GHz; Si; Si BJT LNA; Volterra series analysis; common-emitter circuits; input matching network tuning; intermodulation distortion; out-of-band load impedances; out-of-band source impedances; out-of-band terminations; peak IIP/sub 3/; second-harmonic frequency; subharmonic frequency; third-order IMD; Circuit optimization; Equivalent circuits; Impedance matching; Intermodulation distortion; Low-noise amplifiers; Phase modulation; Power amplifiers; Radiofrequency amplifiers; Transfer functions; Voltage;
Conference_Titel :
Microwave Symposium Digest, 1999 IEEE MTT-S International
Conference_Location :
Anaheim, CA, USA
Print_ISBN :
0-7803-5135-5
DOI :
10.1109/MWSYM.1999.779549
