2.1 The first order lag - low-pass filter

2.1.1 The first order lag (low-pass filter) is described with a differential equation of a type

The first order lag (low-pass filter) has a transfer function

and the transient response equation

2.1.2 Modification of 2.1.1.

Transfer function

Transient response

2.1.3 Modification of 2.1.1.

Transfer function

Transient response