Cable Delay Cancellation with Low-Pass NGD Function

This paper develops a cancellation method of cable delay. The proposed method is based on the low-pass negative group delay (NGD) function. The NGD circuit is constituted by a resistor and RC-parallel network mounted in L-cell and a non-inverter amplifier. The design equations of the NGD circuit are established in function of the cable delay and the operated signal bandwidth. The feasibility of the delay cancellation method is verified with simulations of network constituted by three parallel cables with 2 m, 4 m and 6 m physical lengths. Due to the low-pass NGD function, time-domain results show the cable delay cancellation effect. The cable outputs are synchronized with the pulse input signal with 0.25 μs duration.