Phase Shifter Design Based on Vector Modulator

• Main Authors: Lin, Wei Zhen, 林威震
• Other Authors: Kuo, Chien-Nan
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/84466605828983783191

碩士 === 國立交通大學 === 電子研究所 === 101 === The phase shifter is phase shifter is one of the most important circuit in multi-antenna communication system, such as phased array system. By the function of the phase shifter, we decide what direction of beam we want. In the thesis, two phase shifters are proposed. The first chip is 2.25 GHz 4-bit phase shifter in TSMC 0.18-μm CMOS technology. The phase shifter is composed with quadrature phase generator and variable gain amplifier. From the measurement results, when the phase shifter is at the center frequency, it generates 16 states of phase. The root mean square (RMS) phase error and the root mean square (RMS) magnitude error are lower than 1 degree, and 0.3 dB, respectively. The gain of phase shifter is -2.74 dB. The DC power consumption of core circuit is 10.28 mW from 1.8 V supply. The second chip is 0.75~2.67 GHz 5-bit phase shifter in TSMC 0.18-μm CMOS technology. The phase shifter is composed with quadrature phase generator, amplifier, and attenuator. From the measurement results, when operating frequency of phase shifter is 0.75~2.67 GHz, it generates 32 states of phase. The root mean square (RMS) phase error and the root mean square (RMS) magnitude error are lower than 3.5 degree, and 0.4 dB, respectively. The gain of phase shifter is 3.6~-17.22 dB. The DC power consumption of core circuit is 6.39 mW from 1.8 V supply.