An accurate phase shift detector using bulk voltage boosting technique for sensing applications

This paper introduces a phase shift detector (PSD) with high accuracy for sensing applications. The proposed design comprises a Narrow bandpass filter, a Comparator, and an Offset calibration circuit. Narrow bandpass filter rejects all the signals except that generated from a Fixed-frequency Generator. To reduce the error caused by circuit noise and external interface, Offset calibration circuit (OCC) is utilized to calibrate the Comparator. The proposed phase shift detector circuit is realized on silicon using a 0.18 μm CMOS technology. The post-layout simulation results show that the proposed design is able to detect the phase difference from -90° to 90°, where the maximum output error of the proposed PSD is 2.37%. Besides, the power consumption is 4.365 mW @ 10 MHz given a 0.9 V power supply voltage.