ADA4938 or ADA4939 in the band 0=500mHz C=some Pf
Could you share more details about your application? What be your application requirements?
may be on the input of the amplifier must be the inductance with the impedance equal to the capacitive impedance of the sensor ?
1. Is your sensor in IC form, is it a voltage output device? If yes:
2. What is its output impedance? High or low? If it has a high output impedance, use ADA4817-2, the first amplifier buffer configured and the other one with gain. If low output impedance, use ADA4927.
Sensor is piezoelectric crystal or a crystal with two electrodes.
C=10-30pF , R=100 GOm. a bit like a photodiode.
The first buffer must be inverting or not ?
For the buffer stage, i suggest the non-inverting (+1) to get rid of additional components that might add errors and noise to the signal.
Thank you, Jino
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