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inverter design ---- equal rise time and fall time

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squirrel

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inverter rise time

hello... i need to design an inverter in microwind. the requirement is that the interver should have equal rise time & fall time.. .... how can i manage this (changing w/l ratio or what)?

please help
 

equal rise and fall time

by source/sink current calibration or use current mirror to bias the output inverter stage
 

microwind inverter with different wn, wp

squirrel said:
hello... i need to design an inverter in microwind. the requirement is that the interver should have equal rise time & fall time.. .... how can i manage this (changing w/l ratio or what)?

please help
Click to expand...

By changing the W/L ratios accoding to mobilities of holes and electrons, the delay can be matched in both cases....
 

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    squirrel

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sizing inverter for rist time and fall time

(W/L)p / (W/L)n = µn/µp
 

design inverter in microwind

By changing the W/L ratios.
Wp(PMOS) = 2.5 to 3 times Wn(NMOS)
 

inverter microwind design

If the inverter has the equal rise and fall time, then the charge and discharge current of the inverter's load capacator should be the same. So the aim is to choose the right W/L ratio of PMOS and NMOS, let the current of them to be equal.
 

inverter rise time and delay

hi,

By changing the W/L ratios.

Wp(PMOS) = 2.5 to 3 times Wn(NMOS)

according to this relations you can set equal tr and tf.

thanx.......
 

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