How to detect dv/dt accurately?

[hardings]

As the title

I want to integrate one dv/dt detector into IC, so the resistor and capacitor value can not too large.Normal differential circuit need large R and C.
Anyone has good advice?

B.R.

 

[Borber]

Will you explain on what signal you want to make dV/dt. Differentiating RC circuit is nothing but high pass filter with cutoff frequency greater than maximal frequency of signal. Signal frequency is somewhere on rising slope of filter below -3dB point.

 

[nand_gates]

You can try using somekind of capacitance multipler circuit to get
large RC product!

 

[yeewong_su]

Depend on your requirment. also it can creative by RC net

 

[hardings]

I will check the dvdt of cosine wave, the cosine wave have fixed freuqency but different amplitude.

We don't know when the cosine wave will begin, so we want to detect the dvdt to get the information.

 

[nand_gates]

What do you mean by "begininig of cosine wave"??
Do you want to say when it crossess 0v??
Then for that you can use zero crossing detector!
Any way integrating cosine wave will give you sine wave!

Why u say that you have cosine wave ?? Do you mean you have reference
sine wave???