RF Blockset 2.5

Ladder Filters

This model uses LC Bandpass Tee blocks to create two Chebyshev I filters with a passband ripple of 1 dB and 0.1 dB respectively.

Contents

Demo Model

Filter specifications: Center frequency = 75 MHz, Source impedance = 0.01 ohms and Load impedance = 1e5 ohms.

Fig. 1 Ladder filters demo model:

Simulation Results

The following figure shows the filter frequency responses ranging from 70 MHz to 80 MHz. It illustrates passband ripple design and the effects of filter order on roll off.

Fig. 2 Filter frequency responses:

Reference

Chris Bowick, RF Circuit Design, Indianapolis: H.W. Sams, 1982.