A 37–42 GHz Continuous Tunable Phase Shifter in 150 nm GaAs pHEMT

A continuous tunable low loss phase shifter with a relative phase shift range of 360° is presented in this paper. This phase shifter consists 3-bit digital phase shifter cell and a 45° continuous tunable analog phase shifter cell. A SPDT switch is used to switch the signal path. The composite right/left hand transmission line is employed in analog phase shifter cell to achieve the low path loss and the compact layout. The proposed phase shifter is implemented with 0.15 um GaAs pHEMT process. The maximum power consumption of the phase shifter is 63 mW with a 2.5 V supply voltage. The post layout simulation shows that the phase shifter achieves 360° phase shift, and the phase error is better than 2.62° of the 3-bit digital phase shifter and the loss is better than −12.8 dB. The proposed phase shifter achieves an operating bandwidth of 37–42GHz which can be applied to the 5G communication.