why is important to consider matching in the design of a ring oscillator? What if one...

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Electrical Engineering

why is important to consider matching in the design of a ringoscillator? What if one were to neglect matching? What impact wouldit have in a commercial product?

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Ring oscillators fabricated on silicon using ptype MOSFETsA schematic of a simple 3inverter ring oscillator whose outputfrequency is 16inverter delayA ring oscillator is a device composed of anodd number of NOT gates in a ring whose output oscillates betweentwo voltage levels representing true and falseThe NOT gates or inverters are attached in a chain and the outputof the last inverter is fed back into the firstDetailsEditBecause a single inverter computes the logical NOT of its inputit can be shown that the last output of a chain of an odd number ofinverters is the logical NOT of the first input The final outputis asserted a finite amount of time after the first input isasserted and the feedback of the last output to the input causesoscillationA circular chain composed of an even number of inverters cannotbe used as a ring oscillator The last output in this case is thesame as the input However this configuration of inverter feedbackcan be used as a storage element and it is the basic building blockof static random access memory or SRAMThe stages of the ring oscillator are often differential stagesthat are more immune to external disturbances This rendersavailable also noninverting stages A ring oscillator can be See Answer

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