Active Filter It is phasor time again. Active Low Pass Filter Amplification: R F /R S low pass factor 1/(1+j  R F C F ) Cut off frequency:  R F C F.

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Presentation transcript:

Active Filter It is phasor time again

Active Low Pass Filter Amplification: R F /R S low pass factor 1/(1+j  R F C F ) Cut off frequency:  R F C F =1 R F /R S =10, 1/R F C F =1

Figure 8.24, Active high-pass filter R F /R S =10, 1/R F C F =1

Figure 8.26, Active bandpass filter Figure 8.26 Normalized amplitude response of active bandpass filter Figure 8.27

Op Amp Integrator Examples: 8.6, 8.7 Drafting problem

Op Amp differentiator Triangle wave to square wave

Physical Limitations of Op Amp Voltage limit: V S - < v out <V S +

Frequency Response Limits The product of gain and band width in any given op-amp is constant, i.e. A  = K Increasing the gain-bandwidth product by means of amplifiers in cascade. Offset voltage limit Slew rate limit

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