Filter Circuits
Dale R. Patrick, Stephen W. Fardo, Ray E. Richardson, Vigyan Chandra · River Publishers eBooks · 2023
Filter circuits are primarily constructed using passive components such as resistors, capacitors, and inductors. Filter circuits have a specific frequency response curve associated with their operation. Filter circuits are designed to respond in some way to specific or variable AC frequencies. These circuits are designed to pass certain frequencies from input to output and block other frequencies. A band-reject filter is designed to block only an intermediate band of frequencies that lie between designated low-and high-frequency limits. In filter circuits, decibels are used to show the power or voltage gain/loss at various frequencies. Resonant circuits are designed to pass a certain range of frequencies and block other frequencies. Active filters have several unique advantages over passive filters. Faults in the active components, such as op-amps, generally cause a change in the desired level of amplification. In most cases, repair of the active components is not possible owing to the complexity of its internal construction, and replacement is necessary.