The square and triangular waveform generator has been discussed in previous section with the necessary waveform and equations.
To generate the triangular wave, a basic integrator circuit is used with step signal as an input is shown in figure below.
Vo=-1/RC ∫(-V) dt
Thus output voltage increases linearly with time ‘t’; but after some time it goes into saturation as shown below.
The current flowing through resistor ‘R’ is
As voltage ’V’ and ‘R’ both are constant, current ‘I’ is also constant. This constant current ‘I’ is also flowing through capacitor C. When capacitor charges with current ‘I’; it is called as constant current charging. When capacitor is charged up to constant current, voltage across capacitor is linearly increased with time i.e. ramp signal.
If current ‘I’ is large, slope of ramp is large. If current ‘I’ is small, slope of ramp is small.