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68. Which of the following summarizes the important features of ECL?
(a) Low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
(b) Good noise immunity, negative logic, high frequency capability, low power dissipation, and short propagation time
(c) Slow propagation time, high frequency response, low power consumption, and high output voltage swings
(d) Poor noise immunity, positive supply voltage operation, good low frequency operation, and low power
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