emitter-coupled logic inel 4207. differential pair as basic element of ecl
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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=−1.7V 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 14.26 Basic circuit of the ECL 10K logic-gate familytp≈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 14.27 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 14.4.6)
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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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VOH= -0.88V. Take into account base current and variations in vBE. Assume that at iC= 1mA, vBE= 0.75V
Figure 14.30 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 14.33 Equivalent circuit for determining the temperature coefficient of the reference voltage VR
d=-2mV/C
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∆VOL= -0.43δFigure 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. Neglect base currents and assume VBE=0.7V if a transistor is ON.