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why the slope is different in my bandgap simulation
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wangkes9



Joined: 10 Jan 2008
Posts: 43
Post29 Jun 2009 4:21   

why the slope is different in my bandgap simulation
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.
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saro_k_82



Joined: 17 May 2007
Posts: 258
Helped: 55
Location: India
Post29 Jun 2009 4:48   

Re: why the slope is different in my bandgap simulation
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.
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