3-Lesson_Notes_Lecture26_ee205 - EE 205 Dr. A. Zidouri- 1-...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EE 205 Dr. A. Zidouri- 1- Electric Circuits II Frequency Selective Circuits (Filters) Low Pass Filter Lecture #26 EE 205 Dr. A. Zidouri- 2- The material to be covered in this lecture is as follows: o Introduction to the Low Pass filter o The Series RL Circuit- Qualitative Analysis o Defining The Cutoff Frequency o The Series RL Circuit- Quantitative Analysis After finishing this lecture you should be able to: ¾ Understand the Behavior of Low-Pass Filters ¾ Understand the cutoff frequency. ¾ Relate cutoff frequency to component values ¾ Analyze Qualitatively And Quantitatively A Low-Pass Filter ¾ Design A Simple Low-Pass Filter EE 205 Dr. A. Zidouri- 3- Introduction to Low Pass Filter Filters that will be considered here and in following lectures are passive filters. We will examine in this and next lecture two circuits that behave as low-pass filters Fig. 36-1 o Series RL Circuit o Series RC Circuit Discover what characteristics of these circuits determine the cutoff frequency. Note across which element the output signal is taken for the above two circuits EE 205 Dr. A. Zidouri- 4- The Series RL Circuit – Qualitative Analysis Let us start with a Low-Pass Filter, series RL Circuit shown in Fig. 36-2a Assume the circuit’s input is a sinusoidal voltage source with varying frequency The circuit’s output is the voltage across R . Behavior of R will not change with changing frequency Behavior of inductor L will change with changing frequency ¾ Recall that the impedance of an inductor is j L ω at low frequencies the inductor’s impedance is very small compared with the resistor’s impedance, ¾ The inductor effectively functions as a short circuit. The term low frequencies thus refers to any frequencies for which L R ω ¡ ¾ The equivalent circuit for...
View Full Document

Page1 / 14

3-Lesson_Notes_Lecture26_ee205 - EE 205 Dr. A. Zidouri- 1-...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online