Also, \$w_n=w_p\$, causes an infinite response (undamped system - oscillator). Circuit Copied From Bode Plot - 4. The meaning of \$w_n\$ for the Butterworth response is the same as for the first-order case, that is, \$w_n\$ represents the -3 dB frequency, also called cuttoff frequency. I don't use Multisim, but it's easy to find an amplifier's voltage gain and input and output impedances with the CircuitLab circuit simulator. 3 Circuits Date Created 10 months ago Last Modified 10 months ago Tags This circuit has no tags currently. The magnitude curve is sais to be maximally flat (no peak). In filter theory, that special value for \$\zeta=0.707\$ corresponds to a Butterworth response. Note on figure below: When varying the damping ratio \$\zeta\$, the peak follows a specific curve. To get a bode plot, place a Bode Plotter from the instruments toolbar and wire it as shown below. Where \$\omega_n\$ is the natural frequency (also called corner frequency when considering assymptotes), the peak Bode plots are traditionally done in log axis and are most useful to determine the role of frequency on the circuits and as you might have found out this circuit is strongly frequency dependent. Peaks in the frequency response can only exist in systems with conjugate complex poles.įor an underdamped (\$\zeta 0.5\$) second-order system, the peak appears specifically for \$\zeta<1/\sqrt$$
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |