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May 23rd, 2022, 11:26pm
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Bandgap design (Read 777 times)
rajasekhar
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Bandgap design
Aug 16th, 2021, 10:38am
 
Dear All-
I haven't seen any bandgap design with npn devices, through they are available in the kit? At least in TSMC i have seen both npn and pnp but every one (including me) designed with pnp itself? Their Beta values are very similar even. Can any one please share your experience or please point me a reference.

Thanks,
Raj.
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aznsj
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Re: Bandgap design
Reply #1 - Nov 24th, 2021, 10:50am
 
NPN needs deep-nwell process usually is expensive. so from cost point of view it is not used very often. Smiley
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dnw
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Re: Bandgap design
Reply #2 - Nov 26th, 2021, 8:54pm
 
I think this is a good reference

https://www.youtube.com/watch?v=CG7rTigfPYE

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Horror Vacui
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Re: Bandgap design
Reply #3 - Mar 14th, 2022, 7:45am
 
You have to use, what is available on the technology you use. CMOS technologies rarely have optimized diodes, or BJTs. These devices are formed by process steps required for CMOS transistor formation, and they are optimized for MOS transistors. One can say that the BJTs in a CMOS process are often parasitic devices. As /aznsj said, PNPs are usually better suited in a general CMOS process.
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