Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

Idealized Baseband Filters

This model shows how to use Bandpass RF Filter blocks from the SimRF™ Idealized Baseband library to compare two Chebyshev I filters of order 3 and 5 with passband ripple of 1 dB..

Example Model

Filter specifications: Center frequency = 75 MHz, Lower passband edge frequency = 72 MHz and Upper passband edge frequency = 78 MHz. Based on these parameters, the bandwidth of the filter at -1 dB = (78-72) = 6 MHz.

Fig. 1 Idealized Baseband filter example model:

Simulation Results

The following figure shows the equivalent baseband frequency response of the filter from 70 MHz (-0.5 MHz) to 80 MHz (0.5 MHz). As expected, the frequency response of the 5th order filter has five ripples and the frequency response of the 3rd order filter has three ripples. Also, the roll-off of the 5th order filter is steeper than the roll-off of the 3rd order filter.

Fig. 2 Filter frequency responses:

Was this topic helpful?