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**Emitter-Coupled Logic**

INEL 4207

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**Differential Pair as basic element of ECL**

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**Simplified ECL Inverter**

Example: Select R so that Vo= -1.5V. Use IEE= 0.1mA.

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**ECL with Resistor Biasing**

Example: Find R and R3 if VEE= VEE2=−5.2V, VL=−1.3V, IEE= 300μA and IEE2= 100μA.

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**Example: Use the above circuit design an ECL gate for which VH=−1**

Example: Use the above circuit design an ECL gate for which VH=−1.7V and VL=−2.3V . The average power dissipation should be less that 2mW. The supply voltage is −5.2V . Neglect the base currents.

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Find VR if vD1= vD2 vD2= vBE= 0.75V. Neglect iB

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Figure Basic circuit of the ECL 10K logic-gate family tp≈1ns, the time it takes light to travel 1 foot.

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**Practice Problem For previous circuit, find**

IE through RE if A and B are left open. Also find vC, QR and vCA,B. Use VR= -1.32V, VBE=0.75V and a very large β.

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Figure The proper way to connect high-speed logic gates such as ECL. Properly terminating the transmission line connecting the two gates eliminates the “ringing” that would otherwise corrupt the logic signals. (See Section )

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**Figure 14.28 Simplified version of the ECL gate for the purpose of finding transfer characteristics.**

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Practice Problems Find VOL and VOH (neglect iC of QR) if β=100. Then find NMH and NML if VIL and VIH are defined as the conditions for which IE, QR/IE, QA= 99 and vice-versa.

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**Figure 14.30 Circuit for determining VOH**

VOH= -0.88V. Take into account base current and variations in vBE. Assume that at iC= 1mA, vBE= 0.75V Figure Circuit for determining VOH

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**Figure 14.29 The OR Transfer Characteristic vOR vs vI, for the circuit in fig. 14.28**

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**Figure 14.31 The NOR Transfer Characteristic**

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**Circuit for finding vNOR vs vI for the range vI>VIH**

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Figure Equivalent circuit for determining the temperature coefficient of the reference voltage VR d=-2mV/C

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**∆VOL= -0.43δ Figure 14.34 Equivalent circuit for determining the temperature coefficient of VOL**

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**Figure 14.35 Equivalent circuit for determining the temperature coefficient of VOH.**

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**Figure 14.36 The wired-OR capability of ECL**

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Figure P14.30

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Figure P14.39

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For the ECL inverter shown in the following sketch, the high voltage level is VH = −1.7V and the average power dissipated when the input is high 50% of the time is P =5mW. Determine the source’s current IEE, the low voltage level VL, the reference voltage level VREF and the value of resistance R3

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**Find VL, VH and VREF for the following circuit**

Find VL, VH and VREF for the following circuit. Neglect base currents and assume VBE=0.7V if a transistor is ON.

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