sarge
Full Member level 3
- Joined
- Dec 29, 2009
- Messages
- 187
- Helped
- 57
- Reputation
- 114
- Reaction score
- 56
- Trophy points
- 1,308
- Activity points
- 2,170
Hi, i'm trying to calculate small signal gain for common emitter amplifier with bjt diode connection load.
For diode connected bjt resistance is equal to parallel connection of Rbe and current source b*Ib. Rbe much smaller then Rcs and therefore Requal ~ Rbe.
For gain we have A = -gm1*Rbe2
Am i right?
Update: Sorry, i said stupid thing, resistance of diode connected load is the Re. But anywhere i still can't calculate small signal gain. Re = Vt/I = 1/gm - same as in mos device. A = gm1/gm2 = (I/Vt)/(I/Vt=1 ^(
Where did i made mistake?
For diode connected bjt resistance is equal to parallel connection of Rbe and current source b*Ib. Rbe much smaller then Rcs and therefore Requal ~ Rbe.
For gain we have A = -gm1*Rbe2
Am i right?
Update: Sorry, i said stupid thing, resistance of diode connected load is the Re. But anywhere i still can't calculate small signal gain. Re = Vt/I = 1/gm - same as in mos device. A = gm1/gm2 = (I/Vt)/(I/Vt=1 ^(
Where did i made mistake?
Last edited:
