AnsweredAssumed Answered

Op Amp amplifier

Question asked by Pepo12 on Jan 30, 2017
Latest reply on Jul 12, 2017 by Gauzz




Sorry if the questions I'm going to ask seem very basic:


I need to amplify the signal of an "inductive" sensor, which is tuned (parallel capacitor) at 300 kHz. A gain of the order of 225 V / V is required and if possible phase = 0 around 300 kHz, therefore, I want to use 2 stages "inverter amplifier" with 15 V / V gain.

I am using 2 AD829.

The questions:


  1 - Can you guide me in the selection of the R, termination of the coaxial cable? At present, I can modify the equibalent impedance of the sensor. But should I use 50, 500, 1000 ohm?


  2 - Is the 2 x "inverter amplifier" configuration adequate?


  3 - As only the AC component is interesting. What should I add to cancel DC ?.


I hope they can guide me. Thank you in advance!