Why is my measurement of the output voltage of my capacitor voltage divider not matching the theory?
I designed a capacitor voltage divider for the purpose of measuring the voltage step up of a resonator. Before I measure the voltage step up I wanted to measure the voltage divider ratio to ensure it matches the theory.
The Theory: Vout = (C1/(C1+C3))*Vin ==> Vin/Vout =~ 76
-Signal generator parameters (Sinewave, 5Vpp, 40MHz)
-Measured output with Oscilloscope (input Impedance = 10MOhms, 13pF)
-Result : Vin = 5V, Vout = 0.2V; Vin/Vout = 25 ??! ~32% off?
-Is there some parasitic capacitance or some problem with my measurement technique that I am not taking into account? Thanks for the help.
-Also, if anyone can help me with the EE Stackexchange equation writing syntax that would be great.