1 GHz Class E RF Power Amplifier For A Polar Transmitter

Design of integrated 1.6 GHz, 2 W tuned RF power amplifier

“…Advantages of inverse class E over classical realization are that the drain peak voltages are lower than in classical class E and the inductance values in the output circuitry are smaller, which can save area in a MMIC chip implementation and can usually give smaller electrical series resistance (ESR) [4]. Also, the possibility to accommondate series inductance as a part of resonating circuitry is useful, since the parasitic reactances can cause undamped resonances to drain waveforms [6,7]. These advantages were the reasons for choosing inverse class E topology as a starting point for our investigation.…”

Design of a linearly assisted switcher for a supply modulated RF transmitter

“…The target system was a polar transmitter consisting of a digital data separator, the modulated supply, and a 0.5 W class E switch-mode power amplifier designed using a discrete CLY5 GaAs MESFET [6]. These were tested as a complete polar transmitter with various modulating signals, and the same supply modulator was also used to drive a linear amplifier in an ET experiment.…”

Integrated 1.6 GHz, 2W Tuned RF Power Amplifier

“…It has been found out in previous work [5], that ZVS condition is quite sensitive to parasitic reactances, that easily generate additional and undamped resonances. Therefore it is beneficial either to bring the pulse-shaping resonator as close to the switch as possible or to somehow take the additonal impedances into account in the circuit design.…”