Answered: C1 R2 R2 C2 Rh Uth R3 R3 Vth = UI R +…

C1 R2 R2 C2 Rh Uth R3 R3 Vth = UI R + R3 R¡R3 Rh R1 + R3 %! (b) Figure 12.9 (a) Band-pass filter using inverting op amp configuration; (b) simplified band-pass filter circuit.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter11: Thermostats, Pressure Switches, And Other Electric Control Devices

Section: Chapter Questions

Problem 23RQ

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Concept explainers

Filter

A filter is a device or process which removes some of the unwanted features or components like frequencies from a signal in signal processing. The feature of filters is the complete or partial suppression of some part of the signal, and filtering is a class of signal processing. This most often means removing some frequency bands or some frequencies. In the frequency domain, the filters do not exclusively act, especially in the image processing field many other targets for filtering exist. Without having to act in the frequency domain, the correlations can be removed for certain frequency components and not for others. The filters are widely used in electronics and telecommunication, in television, radio, radar, audio recording, music synthesis, control systems, computer graphics, and image processing.

Question

(a) Calculate f_o, Q, and the bandwidth for the band-pass filter as shown if R_th = 1 kΩ, R₂ = 200 kΩ, and C₁ = C₂ = 220 pF. (b) Use magnitude scaling to change the element values so that R_th = 3.3 kΩ. (c) Use frequency scaling to
double f_o for the filter in part (a).

C1
R2
R2
C2
Rh
Uth
R3
R3
Vth = UI
R + R3
R¡R3
Rh
R1 + R3
%!
(b)
Figure 12.9 (a) Band-pass filter using inverting op amp configuration; (b) simplified band-pass filter circuit.

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