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[mv]Small capacitance change measurement using Capacitance to Phase conversion method

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nagarajaj09

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I am currently researching on a method to
detect small changes in capacitance using CAPACITANCE TO PHASE
CONVERSION technique.However, I am stuck at a very basic concept. I
am unable determine the use of compensation capacitance at the input.
It would be of great help if somebody could help me understand the basics
of the compensation capacitance(Cc)and its purpose (along with wave
forms if possible).

To make it clearer, I have attached 2 diagrams.
Diagram 1: WITHOUT THE COMPENSATING CAPACITANCE.

Diagram 2: WITH THE COMPENSATING CAPACITANCE (Cc).
In the simulation, I am unable find the difference in the waveforms between
the circuits mentioned above (i.e Diagram1 and Diagram2).
 

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  • Diagram 2.PNG
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Hi,

When you measure a capacitor, then usually you have some stary capacitance. Mainly caused by wiring.

left picture:
To compensate for this it just uses an inverted sine (see the lower path) and a small capacitor.
This acts like a small "negative" capacitor.
It helps to compensate for the stray capacitance.

Klaus
 

KlausST said:
Hi,

When you measure a capacitor, then usually you have some stary capacitance. Mainly caused by wiring.

left picture:
To compensate for this it just uses an inverted sine (see the lower path) and a small capacitor.
This acts like a small "negative" capacitor.
It helps to compensate for the stray capacitance.

Klaus
Click to expand...

Hello,

Thank you for the explanation.It helped in better understanding of the circuit. I will do a little research on the stray capacitance for my understanding.

Thank you
Nagaraj Aj
 

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