Transistors in Saturation

[ammadupm]

How to put transistor in saturaqtion region.......plz give me some examples

 

[IanP]

How to put transistor in saturaqtion region.......plz give me some examples

eg. transistor working as a switch .. see details at:
**broken link removed**

Rgds,
IanP
:|

 

[ammadupm]

i am designing cascoded amplifier using MOSFET, there i am facing this problem (saturation)...mathematically i calculate that my all transistor are in saturation but when i run it on mentrographics using eldo (TSMC 0.18), it shows different result...............this is my problem brother.........

 

[haykding]

Try to solve problem with help of simulation .. Sometime math doesn't help !!!

 

[sutapanaki]

saturation is by definition when Vdsat<Vds.
This said, in many cases Vds is dependent on the circuit itself. So, if you post your circuit with annotated operating point, may be someone will tell you what is going wrong.

 

[dkace]

How many times we think that out transistor works ok in Saturation but it doesn't!

Check (by graph not by annotation in the schematic) the voltages in Gate, Drain and Source.

Then check the vth of the transistor. There might be a fault there but it's the only you have.

If Vds>Vgs-Vth ( as in theory) then you are well in saturation.

If this is the case but not in saturation, you are loosing an info regarding voltages.

D.