Title :
Generalized autocorrelation analysis of spectral regrowth from bandpass nonlinear circuits
Author :
Gard, K. ; Steer, M.B. ; Larson, L.E.
Author_Institution :
Qualcomm Technols Inc., San Diego, CA, USA
Abstract :
Estimation of spectral regrowth generated by a digitally modulated carrier passed through a nonlinear RF circuit is analyzed using a formulation of the output autocorrelation function. The estimation is based on developing an analytical expression for the output power spectrum when the nonlinearity is modeled as a complex power series model extracted from measured amplitude-to-amplitude (AM-AM) and amplitude-to-phase (AM-PM) characteristics. An analytical expression of the output power spectrum is developed from statistical moments for a complex Gaussian input signal. Comparisons are presented of measured versus predicted ACPR values for a CDMA amplifier.
Keywords :
correlation theory; nonlinear distortion; nonlinear network analysis; radiofrequency amplifiers; series (mathematics); AM-AM characteristics; AM-PM characteristics; amplitude-to-amplitude characteristics; amplitude-to-phase characteristics; bandpass nonlinear circuits; complex Gaussian input signal; complex power series model; digitally modulated carrier; generalized autocorrelation analysis; nonlinear RF circuit; output autocorrelation function; output power spectrum; spectral regrowth; statistical moments; Amplitude estimation; Autocorrelation; Circuit analysis; Digital modulation; Power amplifiers; Power generation; Power measurement; Radio frequency; Signal analysis; Spectral analysis;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.966827
