why the slope is different in my bandgap simulation

Status
Not open for further replies.
W

wangkes9

Member level 2
Joined
Jan 10, 2008
Messages
46
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
1,620
In my simple bandgap design , I simulation the slope of Vbe and delta Vbe in TSMC
technology. But the slope of delta Vbe is not k/q(lnn), much smaller. so I have to increase the ratio of R1/R0. So the Vref is not 1.25V , almost 2V

What is wrong? I sim the circuit in chartered technology ,It is the same.
 

This is most probably because all your bulks are open and are at different potentials. There is an offset of more than 25mV on VBE voltage, which can cause high current asymmetry as well.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…