ecl_gates-4sp - Basic ECL Inverter/Non-inverter (ECL...

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1 Emitter-Coupled Logic (ECL) Basic ECL Inverter/Non-inverter (ECL Current Switch) Basic ECL Inverter/Non-inverter VTC V OH = V CC According to inverting output : V INV CI E EE ) ECL ( BE IH CC OL R R V V V V V + = V IL = V BB –0.05 V IH = V BB + 0.05 E CI EE ) SAT ( BE E CI ) SAT ( BC CC S R R 1 ) V V ( R R V V V + + + = Example Calculate the critical VTC points for the ECL current switch V CC = 5V, V EE = 0V, V BB = 2.6V, R CI = R CR = R E = 1k Ω , V BE(ECL) = 0.75V, V BE(SAT) = 0.8V, V BC(SAT) = 0.6V V OH = 5V V OL = 3.10V V IL = 2.55V V IH = 2.65V V S = 3.2V V INV (V IN = V S ) = 2.6V
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Basic ECL NOR/OR Gate MECL I NOR/OR Gate ) ECL ( BE CI DN F CI ) ECL ( BE EE OH V R R ) 1 ( β R V V V + + = ) ECL ( BE CI E EE ) ECL ( BE IH OL V R R V V V V + = Example Find the logical swing, noise margins and noise immunities for the MECL I circuit above. β F = 49, V BE(ECL) = 0.75V, V BE(FA) = 0.75V, V BE(SAT) = 0.8V, V BC(SAT) = 0.6V V OH = – 0.76V V OL
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ecl_gates-4sp - Basic ECL Inverter/Non-inverter (ECL...

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