LiquidOrb24
New Member
Hello All,
I'm having a hard time trying to solve a problem of mine. Basically I'm picking off an RF signal at a frequency of 13.56MHz and imputing the sinal into an IC that analyzes the data and shoots out a 1-1.8V (DC) signal corresponding to phase information on the RF line. However I want to input this (DC) signal into a microcontroller to analyze it further but I'm still getting a 13.56MHz signal tagged onto the DC signal.
I tried using a low pass filter before the microcontroller to filter everything out above 2KHz just to make sure but I'm still getting a small amount of noise on it. All of my grounding is good and am not radiating anything onto the DC side of the board where the microcontroller is but still nothing.
My next attemp would be to use an op-amp with either a low pass filter configureation or using an op-amp as a buffer because of the high input impedance.
Any suggestions on filtering an RF signal from a DC line...it would be most greatly appreciated.
I'm having a hard time trying to solve a problem of mine. Basically I'm picking off an RF signal at a frequency of 13.56MHz and imputing the sinal into an IC that analyzes the data and shoots out a 1-1.8V (DC) signal corresponding to phase information on the RF line. However I want to input this (DC) signal into a microcontroller to analyze it further but I'm still getting a 13.56MHz signal tagged onto the DC signal.
I tried using a low pass filter before the microcontroller to filter everything out above 2KHz just to make sure but I'm still getting a small amount of noise on it. All of my grounding is good and am not radiating anything onto the DC side of the board where the microcontroller is but still nothing.
My next attemp would be to use an op-amp with either a low pass filter configureation or using an op-amp as a buffer because of the high input impedance.
Any suggestions on filtering an RF signal from a DC line...it would be most greatly appreciated.