Need modification in capacitance to voltage meter!!!

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angy

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Following circuit is used to measure voltage for capacitor Cx in range of 0.01 uf to 0.1uf.But i want reading for capacitor value 60pf to 150pf.So what changes should be done in the circuit to obtain linear graph b/w capacitor vale and graph

 

The capacitance under 1 nF is barely readable by your circuit. Find a circuit designed for your range. I would use a resonance method with a calibrated variable capacitor substitute.
The are low-cost DVMs with capacitance meters that can measure from units of pF, better than build your own meter.
 

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