How to find delta Vbe/delta T for bandgap from the process ?

[surianova]

delta vbe

How to find the (delta Vbe/delta T) for bandgap design from the process parameter?

Surianova

 

[Btrend]

Re: delta Vbe/delta T

u can do a dc analysis, like this

VS OUT IP DC 0V
Q1 VSS VSS IP BIP10 M=1
I1 0 OUT DC CUR
V1 VSS 0 DC 0
.TEMP 27
.OPTIONS NOMOD NOPAGE ACCT POST
.DC temp -20 120 1 sweep CUR 6u 12u 2u
.PARAM CUR=6u
.INC bjt_model
.meas dc DVE_DT DERIV v(ip) when v(ip)=0.663 CROSS=1
.ends

 

[surianova]

Re: delta Vbe/delta T

u can do a dc analysis, like this

VS OUT IP DC 0V
Q1 VSS VSS IP BIP10 M=1
I1 0 OUT DC CUR
V1 VSS 0 DC 0
.TEMP 27
.OPTIONS NOMOD NOPAGE ACCT POST
.DC temp -20 120 1 sweep CUR 6u 12u 2u
.PARAM CUR=6u
.INC bjt_model
.meas dc DVE_DT DERIV v(ip) when v(ip)=0.663 CROSS=1
.ends

can i find it from process parameter without simulation?

 

[aryajur]

Re: delta Vbe/delta T

can i find it from process parameter without simulation?

I don't think so because its not a constant number.

 

[wolf001]

delta Vbe/delta T

u should do dc simulation.For the delta Vbe/delta T is not constant for a bandgap like the relation for a single bipolar transistor..

 

[surianova]

Re: delta Vbe/delta T

u can do a dc analysis, like this

.meas dc DVE_DT DERIV v(ip) when v(ip)=0.663 CROSS=1
.ends

what is this parameter means? thanks

 

[Btrend]

Re: delta Vbe/delta T

it is a measurement command for HSPICE, it is equivalent to "find the derivate of Vbe at Vbe=0.663 with respect to tempearture.