syntfil.html

Introduction to syntfil Package

The package contains functions for design of of electric filters.

Set of functions for solving approximation tasks

normalization - frequency transformation of lowpass (LP), highpass (HP), bandpass (BP) or band-rejection (BS) filter spefifications to normalized lowpass filter (NLP),
computation of the filter order for a chosen type of approximation (Butterworth, Chebyshev, Cauer ),
computation of the Butterworth approximation,
computation of the Chebyshev approximation,
computation of the Cauer approximation (types A, B and C) and
computation of the Inverse Chebyshev approximation (types A and B) .

Functions for bandpass and band-rejection filter design are not included in Syntfil light edition, as well as functions for elliptic filter design (with Cauer or Inverse Chebyshev approximation ), see overview.

results of approximation task are:

secondary parameters of the filter,
zeros and poles of gain and characteristic function,
gain and characteristic function.

Set of functions for LC filter realization from gain and characteristic functions

computation of the chain matrix from gain and characteristic function for a chosen load of filter,
synthesis of LC ladder filter from chain matrix
transformation of LC ladder structure of NLP to LP, HP, BP or BS (in light edition only LP and HP).

Set of functions for cascade design of active RC (ARC) filters

frequency transformation of the transfer function poles and zeros of NLP to particular biquadratic transfer functions parameters , and of desired type of filter (LP, HP, BP or BS ),
assignment of particular zeros to corresponding poles , so-called pole-zero pairing to biquadratic functions are formed,
determination of order in which the biquadratic functions (biquads) should be cascaded,
choosing of the optimum gain distribution to particular biquads and
realization of particular biquads.

Only ARCBlock1 function is included for the gain distribution calculation in Syntfil light edition, as well as functions for synthesis - only LP0, HP0, LP1 and HP1 circuits of ARC filters are included, see overview.

Analysis of resulting filter structures

The analysis includes the Q-factors of inductors for LC ladders and DC open-loop gain and unity-gain frequency of operational amplifiers for ARC filters.

Activation

The syntfil package is possible to activate by with(syntfil) command.

> with(syntfil);

See Also:

This section usualy include three lines of hyperlinks. The first one includes links to help pages of previous level functions (in design process), the second line includes links to functions of same level and the third one includes links to help pages of functions which can succeed to actual function (level).

with , overview, example1, example2

LP2NLP, HP2NLP, BP2NLP, BP22NLP, BS2NLP