Current-controlled sawtooth generator

A simple sawtooth generator with electronic control of the frequency and the amplitude, was presented. The circuit was build around the 555 timer and had used a grounded capacitor and two operational transconductance amplifiers to achieve current control of the amplitude and the frequency of the sawtooth waveform. Since the sawtooth was taken from the capacitor, then any load resistance connected across the capacitors would take its current from the charging current of the capacitor. This resulted in distorting the sawtooth output voltage.