This paper introduces a circuit technique to increase the operating speed of CMOS/ECL interface circuits. The technique is based on shifting the reference voltage dynamically to follow the ECL input signal. HSPICE simulation results based on a 0.8-mu m BiCMOS technology show the advantages of DRV CMOS/ECL in terms of speed and noise margins. An analytical delay model which fits HSPICE simulation results is addressed. The error between the model and the circuit simulator is within 4%.