Title :
Performance of automatic phase adjustment using supply current minimisation in a RF feedback lineariser
Author :
Faulkner, M. ; Contos, D. ; Briffa, M.
Author_Institution :
Dept. of Electr. & Electron. Eng., Victoria Univ. of Technol., Melbourne, Vic., Australia
Abstract :
Amplifier linearisation schemes based on feedback (e.g. cartesian feedback) require a phase correction circuit to stop instability and limit the level of the out-of-band noise floor. A new and very simple method by which the phase correction circuit is adjusted is described. The scheme uses the supply current to the final stage amplifier as a measure of the out-of-band noise, and minimizes this by using a simple direct search algorithm. Phase correction to within 5 degrees of optimum can be obtained after about 50 iterations
Keywords :
circuit stability; feedback amplifiers; linearisation techniques; minimisation; noise; phase control; radiofrequency amplifiers; search problems; RF feedback lineariser; amplifier linearisation; automatic phase adjustment; cartesian feedback; direct search algorithm; final stage amplifier; instability; iterations; out-of-band noise floor; performance; phase correction circuit; supply current minimisation; Bandwidth; Circuit noise; Current measurement; Current supplies; Feedback loop; Phase noise; Power amplifiers; Power generation; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1997. Waves of the Year 2000. PIMRC '97., The 8th IEEE International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-3871-5
DOI :
10.1109/PIMRC.1997.627008
