Title :
A microwave miniaturized linearizer using a parallel diode with a bias feed resistance
Author :
Yamauchi, Kazuhisa ; Mori, Kazutomi ; Nakayama, Masatoshi ; Mitsui, Yasuo ; Takagi, Tadashi
Author_Institution :
Mitsubishi Electr. Corp., Kanagawa, Japan
fDate :
12/1/1997 12:00:00 AM
Abstract :
A miniaturized linearizer using a parallel diode with a bias feed resistance has been proposed. The linearizer has positive gain and negative phase deviations and can be used as a linearizer for power amplifiers. These characteristics are provided by a nonlinearity of the diode and movement of bias point caused by a voltage drop at the bias feed resistance. By applying this linearizer to an S-band power amplifier, improvement of adjacent channel leakage power of 5 dB and improvement of power-added efficiency of 8.5% have been achieved for the π/4-shift QPSK modulated signal
Keywords :
Schottky diodes; adjacent channel interference; intermodulation distortion; microwave circuits; microwave power amplifiers; quadrature phase shift keying; QPSK modulated signal; S-band power amplifier; adjacent channel leakage power; bias feed resistance; bias point; microwave miniaturized linearizer; negative phase deviations; parallel diode; positive gain; power-added efficiency; voltage drop; Anodes; Feeds; High power amplifiers; Microwave amplifiers; Power amplifiers; Quadrature phase shift keying; Radio frequency; Radiofrequency amplifiers; Schottky diodes; Voltage;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
