Introduction

This tutorial on LC filter design should allow you to incorporate into your radio design low pass, high pass and bandpass filters. Your electronic project should then hopefully perform the way you want it to.

Low pass and high pass filters are easy to design and implement. A high pass filter is really just the complement of a low pass filter. On the other hand bandpass filters can get quite complex. Also whilst a LC bandpass filter is particularly helpful in reducing image interference it is not the panacea for all ills. A properly designed, carefully constructed and aligned lc bandpass filter will give you a fractional bandwidth of about 2%. It is likely the percentage bandwidth might be somewhat worse than that.

Bandwiths of LC bandpass filters are more a function of the loaded Q of the circuit which in turn is determined by the terminating resistances. The shape factor i.e. - 6dB to - 60 dB points for LC bandpass filters is more a function of the number of resonators.

This Web page was last updated on Friday September 21, 2001

© 2001 Designed by Colin McCord