Title :
Analysis and simulation of low-frequency feed-forward linearization
Author :
Yu, Shuang ; Roblin, Patrick
Author_Institution :
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA
Abstract :
Theoretical analysis and simulation results of low-frequency feed-forward linearization are presented. A new constraint is demonstrated to be required to simultaneously cancel the upper and lower IMD3 frequencies generated by third-order intermodulation distortion. This constraint is independent from the low-frequency feed-forward signal but can be satisfied by adjusting the DC bias point. Simulations for a two-tone signal in the AMPS band, in a LDMOSFET power RF amplifier, demonstrate that a reduction of at least 20 dB in third-order intermodulation distortion can be achieved at either low or high input-power levels
Keywords :
feedforward; intermodulation distortion; linearisation techniques; nonlinear network analysis; power amplifiers; radiofrequency amplifiers; AMPS band; DC bias point adjustment; IMD3 frequencies cancellation; LDMOSFET power RF amplifier; LF feedforward linearization; harmonic balance simulations; intermodulation distortion; low-frequency linearization; lower IMD3 frequencies; phase constraint; third-order IMD reduction; two-tone signal; upper IMD3 frequencies; Analytical models; Constraint theory; Feedforward systems; Intermodulation distortion; Intrusion detection; RF signals; Radio frequency; Radiofrequency amplifiers; Signal analysis; Telephone sets;
Conference_Titel :
Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-7150-X
DOI :
10.1109/MWSCAS.2001.986305
