Temperature tracking and supply voltage independent line driver for ECL circuits

摘要

An active pulldown means is provided for the output line of an ECL gate. The pulldown means utilizes a Wilson current mirror as a differential-to-single ended converter in a transition detection arrangement which tracks temperature variations and rejects supply voltage transients in order to ensure correct operation under all conditions. The desired and the present output conditions are compared in the detection scheme. High transient current is supplied to the output only when the two output conditions do not match for output high-to-low transitions.