sunking said:with op is better.
both of them need trimming for product.
kenlino said:process variation is the nodus for precise bandgap voltage without trimming
holddreams said:How will you start to design the bandgap circuit?
How to determin the two resistors used in bandgap circuit?
I run a .tran simulation ,and at the same time sweep the temperature, but the bandgap output is decreasing as the temperature increase, How to solve this problem?Does it mean that the two resistors I used are wrong?
Thx.
dennislau said:holddreams said:How will you start to design the bandgap circuit?
How to determin the two resistors used in bandgap circuit?
I run a .tran simulation ,and at the same time sweep the temperature, but the bandgap output is decreasing as the temperature increase, How to solve this problem?Does it mean that the two resistors I used are wrong?
Thx.
Usually, in the conventional bandgap circuit design, we can use the equation Vref=Vbe+ (kT/q) x (lnN) x (R2/R1) to calculate the two resisors value where N typically chosen to be 8 or 24 from matching point of view .
It is mentioned that the bandgap output is decreasing as the temperature increase. Could you tell us how much it decrease?
Chethan said:dennislau said:holddreams said:How will you start to design the bandgap circuit?
How to determin the two resistors used in bandgap circuit?
I run a .tran simulation ,and at the same time sweep the temperature, but the bandgap output is decreasing as the temperature increase, How to solve this problem?Does it mean that the two resistors I used are wrong?
Thx.
Usually, in the conventional bandgap circuit design, we can use the equation Vref=Vbe+ (kT/q) x (lnN) x (R2/R1) to calculate the two resisors value where N typically chosen to be 8 or 24 from matching point of view .
It is mentioned that the bandgap output is decreasing as the temperature increase. Could you tell us how much it decrease?
Hi,
The BGR i have designed has the temperature plot as shown in the figure. The reference voltage drastically decreases as the temperature increases. can some one please tell me how should i compensate it.
thanx in advance
Chethan said:yes,
the reference voltage reduces considerably as temperature increases. can someone explain how to correct it.
thanx in advance
chethan
allan_guo said:Chethan said:yes,
the reference voltage reduces considerably as temperature increases. can someone explain how to correct it.
thanx in advance
chethan
the curve is correct,the voltage drop with the temp increase because of 2nd effect,
the zero temp coef only one point(usully room temp). Few papers write about the rectify of 2nd curve.
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