design of the three stage comparator

puush · Mar 17, 2013

I have question on ic design methodology. I read several book on how to design circuits or systems. the book explained on basic methodology that i need to follow. the question is, let say my project in 0.18micro technology, how to get all cmos parameters like µ, λ, Vth, Φ and etc. Right now, I just randomly change the W and L and check the simulation result. For your information, I am doing the project using cadence using spectre bsimv3........... can you send me the specifications????

nitishn5 · Mar 18, 2013

It is always best if you calculate these values on your own. You can follow the following steps.

1. Do a dc operating point simulation of a NMOS and PMOS with different V_gs and V_ds.
2. Find out Id and V_th of both transistors from the operating point solution.
3. Use the equation Id = 0.5µ_nC_ox(W/L)(V_gs - V_th)² and calculate µ_nC_ox.
4. Try this out for different values of W/L, V_gs and V_ds.
5. With more values you can also find out λ (Channel length modulation parameter).
6. If you are interested, you can plot the I_d vs V_gs curve by doing a dc sweep. You can then use curve fitting techniques to find out what is the whether the square law holds true. I have seen that for L = 0.18µm, the equation has a power of 1.32.

puush · Mar 18, 2013

nitishn5 said:
It is always best if you calculate these values on your own. You can follow the following steps.

1. Do a dc operating point simulation of a NMOS and PMOS with different V_gs and V_ds.
2. Find out Id and V_th of both transistors from the operating point solution.
3. Use the equation Id = 0.5µ_nC_ox(W/L)(V_gs - V_th)² and calculate µ_nC_ox.
4. Try this out for different values of W/L, V_gs and V_ds.
5. With more values you can also find out λ (Channel length modulation parameter).
6. If you are interested, you can plot the I_d vs V_gs curve by doing a dc sweep. You can then use curve fitting techniques to find out what is the whether the square law holds true. I have seen that for L = 0.18µm, the equation has a power of 1.32.

thankyou... so much

design of the three stage comparator

puush

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nitishn5

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puush

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design of the three stage comparator

puush

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