Title :
A fast method for adaptation of quadrature modulators and demodulators in amplifier linearization circuits
Author :
Cavers, James K.
Author_Institution :
Sch. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada
Abstract :
Imperfections in analog quadrature modulators and demodulators-gain and phase imbalance and DC offset-have a devastating effect on amplifier linearization circuits. Correction circuits have a simple structure, but their parameters must be adjusted adaptively. This paper introduces an adaptation method based on a training sequence consisting solely of a tone at one or more amplitudes. It is faster and more robust than previously published methods
Keywords :
adaptive systems; analogue circuits; demodulators; land mobile radio; linearisation techniques; modulators; radio equipment; radiofrequency amplifiers; DC offset; adaptation method; amplifier linearization circuits; analog circuits; correction circuits; demodulators; gain; phase imbalance; quadrature modulators; tone; training sequence; Circuits; Convergence; Demodulation; Dynamic range; Envelope detectors; Phase modulation; Quantization; Robustness; Testing; Virtual colonoscopy;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.501524
