I was searching for a good and easy way to implement an impedance meter, and I found a very intersting technic in the following link:

http://www.eevblog.com/forum/projects/easy-impedance-(lcr)-measurement-method/

I did a simpified circuit find it attached, knowing that I want to go up to 5Mhz, do you think this will work?
I am wondering about the following:

1. Will the diod behave like a capacitor at around 5Mhz
2. how much slew rate will I need to charge the capacitor for the voltage peak detector (will it reflect the real peak voltage)
3. the precision for the instrument amp and the peak detector
4. what type of IA and opamp do I have to use to be able to go up to 5Mhz

I was thinking about the AD8010, do you think it will do the job, if no what do you propose as a substitute to go up to 5Mhz

thank you

 

any boddy can help me please