Title :
On the performance of Cartesian feedback and feedforward linearization structures operating at 28 GHz
Author :
Zozaya, Alfonso J. ; Bertran, Eduard
Author_Institution :
Dept. de Electron. y Comunicaciones, Univ. de Carabobo, Valencia, Venezuela
Abstract :
Some performance results of the Cartesian feedback and feedforward linearization techniques applied to a class-A power amplifier operating at 28 GHz are presented. The performance of the combination of HMMC-5040 (driver) and HMMC-5033 (power amplifier) is used as benchmark for simulation analysis. This analysis is addressed to show the key aspects on spectral regrowth due to phase margin and loop gain for Cartesian feedback, and time delay, phase and gain mismatch for feedforward. A 16 QAM digital signal at 10 Mbits/s filtered with a squared raised cosine filter with α=0, 25 is used as test signal.
Keywords :
delays; driver circuits; feedback amplifiers; feedforward; filtering theory; linearisation techniques; microwave power amplifiers; quadrature amplitude modulation; 10 Mbits/s; 28 GHz; Cartesian feedback; HMMC-5033; HMMC-5040; QAM digital signal; class-A power amplifier; driver; feedforward linearization technique; loop gain; phase margin; quadrature amplitude modulation; squared raised cosine filter; time delay; Analytical models; Delay effects; Digital filters; Driver circuits; Feedback loop; Hidden Markov models; Linearization techniques; Performance analysis; Power amplifiers; Quadrature amplitude modulation; 65; Cartesian feedback; feedforward; linearization; power amplifier;
Journal_Title :
Broadcasting, IEEE Transactions on
DOI :
10.1109/TBC.2004.837874
