8-GHz low-power voltage-mode second-order allpass filter in 65-nm CMOS

In this paper, a CMOS wide-band low-power second-order voltage-mode allpass filter design is proposed as a true time delay element. The proposed allpass filter core design consists of a single transistor, three resistors, one capacitor and one inductor. As a time delay element, the proposed circuit exhibits a group delay of 34 ps within a bandwidth of 8 GHz while consuming only 926 μW from a 1-V supply voltage. The proposed filter was designed in 65-nm CMOS technology and verified through post-layout simulation results. © 2019 IEEE.