chapter+2 - Ch. 2. Filter 1. Goals Understand what filter...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Ch. 2. Filter 1. Goals Understand what filter is, and understand the characteristics and operating principles of RC filters and Tow-Thomas Biquad filters. 2. Objectives 1. Understand the characteristics and operating principles of a 1st order RC filters 2. Understand the characteristics and operating principles of a Tow-Thomas Biquad filters 3. Implement a 2nd order Tow-Thomas Biquad filter 3. Theory Filter is a circuitry used to pass or attenuate a certain frequency component of given information. It can be classified into low pass filter, high pass filter, band pass filter, and band stop filter according to its f r e q u e n c y characteristics and can be classified into passive filter and active filter according to its components. A passive filter comprises of passive components like capacitor, inductor, and resistors and, since inductors tend to take up large spaces, is difficult to implement in small scales. An active filter refers to a filter that includes OPAMP, an active component, as its component. A point where the power gain is halved in the frequency response of the filter is called a cutoff frequency. The voltage gain at this point is 1/ and is 3dB lower than the passband. Frequency band up to the cutoff frequency is called the bandwidth. F irst order f i lter refers to a f i l ter w ith one po le and/or zero as can be represented by:
Background image of page 1

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

View Full DocumentRight Arrow Icon
       (Eq. 2-1) A first order filter can change the location of pole and zero using only resistors and capacitors and can be implemented into an LPF or HPF as shown on table 1. Location of Pole/Zero Magnitude Response Implementation with passive components Transfer function dB w R C    dB w R C    Table 1 1st order passive filter Imp lement ing a f irst order f i lter us ing on ly pass ive components, as shown on table 1, require a buffer at the output of the filter since the impedance of the upcoming stage affects the transfer function of the filter. Moreover, the gain of the
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/08/2011 for the course EE 111 taught by Professor Kim during the Spring '11 term at Korea University.

Page1 / 10

chapter+2 - Ch. 2. Filter 1. Goals Understand what filter...

This preview shows document pages 1 - 3. Sign up to view the full document.

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