Given the simple nMOS pass transistor circuit shown compute the max voltage that

ID: 1716019 • Letter: G

Question

Given the simple nMOS pass transistor circuit shown compute the max voltage that is possible to pass to the load capacitor (CL=16fF). Design the nMOS pass transistor to be unit size in TSMC 180nm technology. Verify your hand derivations are consistent with the hspice simulation. Write a short report including: Hand calculation (state clearly any assumption you make) hspice deck Input and output voltage waveforms (using either CosmosScope or CustomExplorer) How much is the relative error between hand calculation and SPICE result Explain the discrepancy.

Explanation / Answer

solution-

there is no dc current in the drain to source as there is a capacitor which behaves open ckt at dc.

the transistor will be in the cutt off mode of operation.

to on the transistor apply capacitor paralel to sorce terminal and then find output.

the transistor is also not on for the Vgs is less tahn the Vt ot nmos.

this is a source follower or common drain configuration. in this the output folow the input.

use the 180nm ptm from www.ptm.com and do hspice simulation.

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Given the simple nMOS pass transistor circuit shown compute the max voltage that

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