Aim :
To study the frequency response of active notch filter, determine the phase shift and bandwith.
Apparatus :
CRO, Dual power supply, OP-AMP741, signal generator, resistor, capacitor, etc.
Formula :
Circuit Diagram :
Procedure :
Circuit by – Rajendra Kumar $$$
- Design the circuit of notch filter.
- Study it’s frequency response over a frequency range.
- Plot a graph of gain against frequency. Determine the cut-off frequency and bandwith compare it’s with the expected values.
- Also determine the phase shift.
Observations :
Viva Question and Answers [FAQ] :
1. What is Filter?
Ans : Filter is a device or process that removes some unwanted components or features from a signal.
2. What is Notch Filter?
Ans : A notch filter, usually a simple LC circuit, is used to remove a specific interfering frequency.
3. What is Low Pass?
Ans : Pass frequency higher than a certain cutoff frequency.
4. What is Frequency response?
Ans : The dependence on signal frequency of the output–input ratio of an amplifier or other device.
5. Define cut-off frequency?
Ans : In physics and electrical engineering, a cutoff frequency, corner frequency, or break frequency is a boundary in a system’s frequency response at which energy flowing through the system begins to be reduced (attenuated or reflected) rather than passing through.
6. What is phase shift?
Ans : Phase Difference is used to describe the difference in degrees or radians when two or more alternating quantities reach their maximum or zero values.
7. What is Bandwidth?
Ans : Bandwidth is the amount of data that can be transferred from one point to another within a network in a specific amount of time.