Test circuit to measure diode junction capacitor

[mohan.n2293]

Hi all,
Myself Mohan working as R&D engineer in Zettaone technologies,
I'm searching for test bench to measure junction capacitance of a diode(any diode),
i'm not able to find out the exact circuit to measure or test junction capacitance of diode please any one help me by providing circuit .


Below graph i'm i need to plot by measuring diode junction capacitance.

 

[JimB]

My first thoughts were that you could use an oscillator and measure the frequency as the capacitance changed.
As in this recent thread here:
https://www.electro-tech-online.com...istor-and-rf-transformer.156469/#post-1350239

Then I noticed that the graph stated that the frequency was 1MHz.
So may be you need to make or buy a capacitance measuring bridge that works at 1MHz.

You could try googling " Capacitance bridge 1MHz".
I did and got lots of hits.

JimB

 

[OBW0549]

i'm not able to find out the exact circuit to measure or test junction capacitance of diode please any one help me by providing circuit .

Here are several references providing methods and circuits for testing diode junction capacitance:

https://wiki.analog.com/university/courses/electronics/electronics-lab-pn-junction-cap
https://www.eevblog.com/forum/projects/how-to-measure-p-n-junction-diode-junction-capacitance/
**broken link removed**
https://www.researchgate.net/public...layer_and_diffusion_capacitance_contributions
https://web.engr.uky.edu/~donohue/ee462g/ee462g_5.pdf

 

[mohan.n2293]

My first thoughts were that you could use an oscillator and measure the frequency as the capacitance changed.
As in this recent thread here:
https://www.electro-tech-online.com...istor-and-rf-transformer.156469/#post-1350239

Then I noticed that the graph stated that the frequency was 1MHz.
So may be you need to make or buy a capacitance measuring bridge that works at 1MHz.

You could try googling " Capacitance bridge 1MHz".
I did and got lots of hits.

JimB

Hello Mr. Jim,

may be i was wrong in describing my requirement, I am trying to simulate and verify a PSPICE model of a Diode againt its datasheet characteristics. Do you have any recommendations towards the same ?

Thank you,

BR,
Mohan N

 

[JimB]

Mohan, you said:

I'm searching for test bench to measure junction capacitance of a diode(any diode),

Below graph i'm i need to plot by measuring diode junction capacitance.

Now you say:

may be i was wrong in describing my requirement, I am trying to simulate and verify a PSPICE model of a Diode

Yes indeed you are wrong, there is no doubt about it.
Why did you deliberately ask the wrong question?

Do you have any recommendations towards the same ?

No.

JimB