发射机
脉冲宽度调制
振幅
发射机功率输出
电子工程
物理
电气工程
计算机科学
频道(广播)
工程类
光学
电压
作者
Muhammad Touqir Pasha,Muhammad Fahim Ul Haque,Jamshaid Ahmad,Tim Johansson
出处
期刊:IEEE Transactions on Circuits and Systems Ii-express Briefs
[Institute of Electrical and Electronics Engineers]
日期:2018-11-01
卷期号:65 (11): 1634-1638
标识
DOI:10.1109/tcsii.2017.2766099
摘要
An all-digital pulse width modulated (PWM) transmitter using outphasing is proposed. The transmitter uses PWM to encode the amplitude, and outphasing for enhanced phase control. In this way, the phase resolution of the transmitter is doubled. The proposed scheme was implemented using Stratix IV FGPA and class-D PAs fabricated in a 130 nm standard CMOS. From the measurement results, a spectral performance improvement is observed due to the enhanced phase resolution. As compared to an all-digital polar PWM transmitter, the error vector magnitude for proposed transmitter is reduced by 4.1% and the adjacent channel leakage ratio shows an improvement of 5.6 dB for a 1.4 MHz LTE up-link signal for a carrier frequency of 700 MHz at the saturated output power of 25 dBm.
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