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bandgap reference

Nancy@21

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Hi,
I want to study this bandgap reference circuit. Please suggest.

1. The vbgt expression will be as follows( derivation.jpg).
2. Is it a low voltage folded bandgap reference circuit.

Thanks in advance.
 

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Nancy@21

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Thank you. the attached paper is useful. Is it a low voltage folded bandgap reference circuit.
Is the derivation of vbgt is correct?
 

Nancy@21

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Is it a low voltage folded bandgap reference circuit.
 

arthorios

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It should be correct assuming the resistances connected to nodes vn and vp are the same, i.e. IMP2=IMP4.

Is it a low voltage folded bandgap reference circuit.
I don't know what you mean with folded in this circuit. This is considered a "sub-bandgap voltage reference" since it is below the usual 1.25V bandgap voltage. Because of that, it can also operate at power supplies <1V (which can be considered "low voltage").
 

Nancy@21

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Thank you. I study this reference paper and see this derivation again.
 

deep_sea

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Thank you. the attached paper is useful. Is it a low voltage folded bandgap reference circuit.
Is the derivation of vbgt is correct?
The short version of expression is that you add a PTAT current to a CTAT current to get a zero to absolute temperature (ZAT) current.
PTAT comes from \[\Delta\] VEB /R1 = VT ln (n) / R1.
CTAT voltage VEB is divided by (R2 + (R4||R5) to give a CTAT current.
Both currents are added in IMP4 (ZTAT current).
IMP4 is copied into IMP6 and flows in R3 to produce a ZTAT output voltage as given by the expression you have derived.
 

Nancy@21

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The short version of expression is that you add a PTAT current to a CTAT current to get a zero to absolute temperature (ZAT) current.
PTAT comes from \[\Delta\] VEB /R1 = VT ln (n) / R1.
CTAT voltage VEB is divided by (R2 + (R4||R5) to give a CTAT current.
Both currents are added in IMP4 (ZTAT current).
IMP4 is copied into IMP6 and flows in R3 to produce a ZTAT output voltage as given by the expression you have derived.
Thanks very much for the detailed description. I study it and if needed further I will discusses.
 

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