High-speed serial interface;  High precision;  On-chip matching resistors;  Negative feedback

Using digital terminal control technology, based on the principle of negative feedback dynamic adjustment and adjustable polysilicon resistance strip, a novel high-precision on-chip matching resistor circuit that meets the requirements of high-speed serial interface USB2.0 protocol is designed.Using TSMC’s CMOS 0.25μm mixed-signal model and simulated with spectre simulator in the Cadence software environment, the results show that under the action of 500 MbPs high-speed clock signal, the designed matching resistance value is [44.3 Ω. In the range of 45.6 Ω], the maximum settling time is 6μs, the average error is ±1.45%, the average variation range of the designed resistor is 45×(1±1.45%)Ω, and the maximum error range is 1.56%, which meets and exceeds the high-speed serial interface protocol requirements of 45× (1±10%)Ω.