bhl777
Full Member level 6
Hi All, I have a class E PA operating at 6.78MHz to drive wireless power coils. I also have the data coils using inductive coupling method on the same board, whose input frequency can vary in a range. For example, my input frequency range is 1MHz to 5MHz, and I picked the resonant capacitor to resonant with the data coil at 3MHz (the central point).
When I measure the received sinusoidal signal at the receiver data coil, I found the noise coupling from the power coil is stronger at low frequency than that at high frequency. Here is the waveform comparison at 1MHz case and 5MHz case:
Would anyone teach me how to explain this phenomenon? Thank you!
When I measure the received sinusoidal signal at the receiver data coil, I found the noise coupling from the power coil is stronger at low frequency than that at high frequency. Here is the waveform comparison at 1MHz case and 5MHz case:
Would anyone teach me how to explain this phenomenon? Thank you!