A novel high-efficiency linear transmitter using injection-locked pulsed oscillator

Author

Jeon, Young-Sang ; Yang, Hoe-Sung ; Nam, Sangwook

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., South Korea

Volume

15

Issue

4

fYear

2005

fDate

4/1/2005 12:00:00 AM

Firstpage

214

Lastpage

216

Abstract

This letter presents a novel high-efficiency linear transmitter using pulse-width modulation (PWM). An envelope of radio frequency (RF) input signal is modulated by the PWM. The modulated signal is applied to the gate bias of a class F injection-locked power oscillator and switches it on and off. By filtering the pulsed oscillating output signal of the injection-locked oscillator using high-Q bandpass filter, the input signal is restored. This technique enables the transmitter to have high efficiency with good linearity. Also, there is little distortion near saturation point of an active device. The measured results show efficiency of 54.6% and very good linearity in PCS band at 26.4-dBm output power.

Keywords

band-pass filters; injection locked oscillators; power amplifiers; pulse width modulation; radio transmitters; 54.6 percent; PCS band; PWM; active device; class F injection-locked pulsed oscillator; high-Q bandpass filter; high-efficiency linear transmitter; modulated signal; power amplifier; pulse-width modulation; radio frequency input signal; Band pass filters; Filtering; Injection-locked oscillators; Linearity; Pulse width modulation; RF signals; Radio frequency; Radio transmitters; Space vector pulse width modulation; Switches; Injection-locked oscillator; power amplifier; pulse-width modulation (PWM); pulsed oscillator;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2005.845694

Filename

1416932