Area and Power Efficient Differential Programmable Delay Cell

This work presents an all-digital differential programmable delay circuit for time domain applications, namely, time-to-digital converter and temperature sensor. The proposed differential delay circuit has eight different delay modes depending on the choice of select lines S2S1S0. At 90-nm CMOS, 0.6 V supply voltage and 27°C the delay ranges between 18.32 ns to 113.96 ns at modes 0 and 7, respectively. Besides, the power consumption is noted between 2.74 μW to 2.14 μW at modes 0 and 7, respectively. The differential delay cell designed for the purpose of temperature sensor occupies a layout area of 0.0072 mm².