Abstract
A BiCMOS digital logic gate is analyzed for input voltages with a finite rise or fall time. A new gate delay model to account for the input slope is developed. A set of accurate yet simple closed-form delay expressions are derived for the first time in terms of the input signal slew rate as well as circuit and device parameters. SPICE simulations are used to verify the accuracy of the analytical delay model. The BiCMOS circuit is characterized in terms of the input slew rate, the fan-in, fan-out, and the circuit delay constants. The model can be incorporated in timing simulators and timing analyzers for BiCMOS ULSI circuit design.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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