Hi AudioguruA highpass filter passes harmonics (distortion).
22dB, in theory. With the given opamp and supply voltage, 100mV rms input will cause clipping.What is the in-band gain of the filter?
If the input signal has distortion then the highpass filter makes the distortion appear much worse if the fundamental frequency is attenuated by the filter.Hi Audioguru
Of course yes but it should not add anything to the signal ! it should cover the input signal with adding some restrictions not adding something into that .
Best Regards
Goldsmith
Hi AudioguruIf the input signal has distortion then the highpass filter makes the distortion appear much worse if the fundamental frequency is attenuated by the filter.
Yes, quite obviously. The circuit is simply overloaded.Because the THD created by the circuit
I don't think that you should expect meaningful output signals for a totally overloaded filter circuit.
What is the in-band gain of the filter?
At what input level does it start to distort?
Yes, quite obviously. The circuit is simply overloaded.
The "sinewave" at the input shows plenty of distortion. The highpass filter cuts the fundamental level then the percentage of harmonics (distortion) appears to be increased.
The overload (because the input signal level is too high for the voltage gain of the circuit and the power supply voltage) causes the opamp to severely clip the signal at its output. A clipped signal has plenty of distortion.
The term overload is also commonly used for exceeding the input signal range suitable for linear operation. This is surely the case in your measurement.How the circuit overloaded if the Load impedance is the Scope with 1Mohm ?
I believe that you don't expect it at first sight, but it can easily happen. Exceeding the linear range can also cause a shift of operation point. If you probe the OP input voltages as well and review the datasheet, you'll most likely understand what's going on.I excpect to see a Square Wave at the output or a HPF behaviour with duty cycle the same as the Input - But not changing of duty cycle.
Why do you want this?Is there any idea how to improve the circuit in order to keep the Duty Cycle of 50 % ?
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