Hi,
I want to measure R,L,C using impedance measurement method.
Here i attached an sample circuit. The device under test is mentioned as unknown. It can be R or C or L. With this circuit, i can find the impedance(The input resistance of the inverting amp). Based on the input frequecy, i will calculate the L or C. The Op07 is not supporting the high frequency (like gain10 in 20Khz). So i am not able to measure the pF values. If i select high gain bandwidth ICs(like opa627), it is working only when i give resistance in the Unknown place. when connect C or L, it is giving noisy output.
How to choose an correct opamp for this application? or any filter circuit is required?