Phase Shifters and Power Detectors for 5G Communication

This thesis studies the switch type phase shifters and power detectors. To satisfy the demand of high-speed mobile wireless communications, the 5G mobile communication is under developing and the operating frequency is 38 GHz. Therefore, this thesis chooses this band as the operating frequency of proposed circuits. This thesis first reviews the architectures of different types of phase shifters and power detectors, and also analyzes the operation principles of these circuits. Considering the application, this thesis chooses switch type phase shifter as main architecture. To reduce the phase error caused by the inaccuracy of transistor model, this thesis proposes a phase shifter combining the switch type and reflection type phase shifter. With continuous tuning voltage, it can correct the phase error caused by process variation. It can achieve the phase imbalance of less than and the amplitude imbalance of less than 1.5 dB. On the other hand, cross-coupled pair rectifier has been chosen for the first architecture of power detector. The circuit has the advantage of high output voltage ranging from 1 mV to 700 mV without additional op-amp, so it can simplify the circuit design. Furthermore, the cross-coupled pair rectifier is integrated with an on-chip antenna. It can not only reduce the transfer loss between rectifier and antenna but also reduce production costs. The minimum detectable power of this circuit is dBm and the DC power consumption is 29 mW. In order to increase the detectable power range, the second version of power detector applies self-mixing rectifier as detector circuit, and adds the low noise amplifier and operation amplifier. It achieves the minimum detectable power at dBm and the output voltage range at 125 mV to 1.6 V. The total DC power consumption is 31.5 mW. In this thesis, the proposed circuits have been designed by Keysight ADS and Sonnet for the circuit and EM simulation. The circuits developed in TSMC 40 nm, 65 nm, 90 nm and 180 nm CMOS technology respectively. The switch type phase shifter and power detector with on-chip antenna have been measured in National Taiwan University E.E. Building No.2 with high frequency measurement instrument. The measurement results prove the properties of proposed circuits.