I really like how you use the ATD as an example. I've been playing with some JFETs and GaAs FETs lately, and it's really helped for understanding how to design these basic circuits using these types of transistors.
sir, in differential pair of mosfet, if the current source can be seen as a M3( mosfet ) that mean the current source ISS is equivalent to M3 ( mosfet). How to calculate the Vgs of M3 if the current source ISS =0.5mA and (W/L)3 is chosen arbitrarily by the designer . Can you give me some ideas sir?, thanks you !
@@nurahmedomar You need to add a Vt to get Vgs. What you have given is actually just the overdrive voltage. So the equation to calculate the gate to source voltage of the tail current source, which is M3 in this case and assuming it is n-type is: Vgs3 = Vtn + sqrt( (2 * Id) / (un * Cox * (W3/L3)) ) Also, this is neglecting the channel length modulation term in the drain current equation of (1 + lambda * Vds).
These classes are much better than ones I had at my university time.
I really like how you use the ATD as an example. I've been playing with some JFETs and GaAs FETs lately, and it's really helped for understanding how to design these basic circuits using these types of transistors.
What does ATD mean?
@@strongman325 ATD =Arbitrary Three Terminal Device
If I remember correctly or Arbitrary Transistor Device
These lectures... are so friggin good!
Hi Sir, Good Morning ,Please explain me how does Re increases dynamic range in BJT differential amplifier
You can watch his video about Emitter/Source Degeneration. By placing Re, the slope gets smaller, the range increases at the cost of smaller gain.
sir, in differential pair of mosfet, if the current source can be seen as a M3( mosfet ) that mean the current source ISS is equivalent to M3 ( mosfet). How to calculate the Vgs of M3 if the current source ISS =0.5mA and (W/L)3 is chosen arbitrarily by the designer . Can you give me some ideas sir?, thanks you !
You can calculate the Vgs of M3 by Vgs = sqrt(0.5mA/k'). where k'=1/2*(un*Cox*(W/L)3).
@@nurahmedomar You need to add a Vt to get Vgs. What you have given is actually just the overdrive voltage.
So the equation to calculate the gate to source voltage of the tail current source, which is M3 in this case and assuming it is n-type is:
Vgs3 = Vtn + sqrt( (2 * Id) / (un * Cox * (W3/L3)) )
Also, this is neglecting the channel length modulation term in the drain current equation of (1 + lambda * Vds).