Wondering if anyone has any thoughts on this..
I have a simple non inverting amplifier circuit (LM7321, with a gain of 4.3 (R1=33K, R2=10 K)) running on my lab power supply. The non inverting input is fed with a voltage divider off the rails.
When my battery powered 920MHz xbee transmits at 100mm distance, the op amp output dips up to 1V for the amount of time the xbee is transmitting.
If the xbee is 1m away, the output dips by about 100mV. I have tried a couple of other op amps, same result!\
Just to be clear, The rails and the non inverting input are clean, and the dip in voltage lasts the length of the transmission and is not noisy. Very strange. Attached screen shot of op amp output. transmitter is 100mm away, and BATTERY powered.
Does anyone know what I can do here, short of changing to 2.4GHz?
