Question

1. If you were given a circuit that is an Active High Pass Filter, list all the potential problems that you might need to troubleshoot.

Answer 1

Active High Pass Filter as its name implies, attenuates low frequencies and passes high-frequency signals. It consists of a passive filter section followed by a non-inverting operational amplifier.

This effect, therefore, is used to reduce low-frequency noise.

1. The maximum passband frequency response of the active high pass filter is limited by open-loop characteristics and bandwidth.

2. When using active filters, if we don't select correct components then we get unwanted ripples in the passband or the stopband or unwanted phase shifts in certain frequencies.

3. If the component value is not selected correctly then we end up filtering the frequency which we actually need.

4. The passband of a high-pass filter is all frequencies above the critical frequency. The critical frequency of a high-pass RC filter occurs when Xc=R. An active filter can be obtained by connecting a standard inverting or non-inverting operational amplifier to the basic RC high pass passive filter. The selection of op-amp and gain will determine the output.

5. In high pass filter, the Capacitor is at starting and the resistor is the next. So we feed the value to capacitor and measure through resitor.