Question

Write by computer because the line is not clear about analyze noise margin of the ECL inverter.
And Write by computer about the static power dissipation of the ECL inverter.

And ues equations

Answer 1

Analyze noise margin of the ECL inverter.

Ans:

Introduction:  Emitter-coupled logic (ECL) is the fastest logic circuit family available for conventional logic-system design. High speed is achieved by operating all bipolar transistors out of saturation, thus avoiding storage-time delays, and by keeping the logic signal swings relatively small (about 0.8 V or less), thus reducing the time required to charge and discharge the various load and parasitic capacitances.

According to the analysis, in average cases of the noise margin of ECL, the bias current remains approximately constant. Also, the e output voltage corresponding to vI = VR is approximately equal to VR. Notice further that this is also approximately the midpoint of the logic swing; specifically,

(VOL +VOH)/ 2 = −1.32h

Thus the output logic levels are centered around the midpoint of the input transition band. This is an ideal situation from the point of view of noise margins, and it is one of the reasons for selecting the rather arbitrary-looking numbers (VR = −1.32 V and VEE = 5.2 V) for reference and supply voltages.

The noise margins can now be evaluated as follows: NMH = VOH −V_IH

NML = V_IL −V_OL

Therefore, ECL circuits available on the open market usually operated with logic levels incompatible with other families. This meant that interoperation between ECL and other logic families, such as the popular TTL family, required additional interface circuits. The fact that the high and low logic levels are relatively close meant that ECL suffers from small noise margins, which can be troublesome.

Static power dissipation of the ECL inverter.

Ans: Static power dissipation occurs when the design is at steady state. this results due to the leakage current flow through the transistors/devices in the design when a supply voltage is applied, So to reduce static power we should add,

• power switches, which will shutoff the power
• multi voltage Island, Mutli Vt cells
• Multi voltage supplies

If we focus on static power consumption, ECL is a high-power logic family. However, if we consider dynamic power consumption, ECL can be more efficient than CMOS, especially as the frequency of operation increases. Therefore, ECL is considered to be a very high-speed logic family. It achieves its high-speed operation by employing a relatively small voltage swing and preventing the transistors from entering the saturation region.

ECL dissipates a relatively large amount of static power, but its overall current consumption is lower than that of CMOS at high frequencies. Thus, ECL is particularly advantageous in clock-distribution circuits and other high-frequency applications.

If these things are kept under consideration while generating ECL inverter, then problems like current-flow leaking, voltage down etc will be eliminated and the circuit works in a flow, hence nothing remains static .

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