Hi Michael, Thank you very much for your prompt response.

1) Try the 7660 with larger capacitors.

I tried increasing the capacitors values to 100uF but there is no significant improvement in output voltage It improve hardly by 0.2 vots.

2) Find an opamp that has much lower supply current requirement. Linear Tech and TI both have parts that have supply currents in the less than 0.5 mA range.

A few months ago I made a lot of attempt to change the TL084 with some other Rail to Rail op-Amp so that I can use it with +5V -5V supply or +5V single supply. But the problem is my application for CT signal conditioning [i.e. Precision rectification] TL084 gives me JFET high input impepedence inputs. I couldn't find any other easily available and economical op-Amp for my application.

Regards,
Prahlad Purohit