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New approaches to high-speed emitter-coupled logic circuitry, overcoming system drawbacks by eliminating sensitivity to environmental changes, are discussed. A comparison is made with uncompensated conventional ECL. Circuits displaying threshold and level invariance over wide ranges of ambient temperature, typically greater than 0°-75°C, and supply voltage, -4.7 to -6.2 V, are described. Suggestions are made as to how these features can lead to higher performance, and at the same time, lower cost systems.