Ultra low frequency CMOS ring oscillator design

In this paper, the concept of CMOS thyristor has been used to implement low frequency ring oscillator using 2.5 volt power-supply and 1pF load capacitance using 250nm technology. By using the conventional CMOS thyristor structure the frequency of the output sinusoidal waveform is of the order of KHz, which has been further improved in proposed CMOS thyristor based ring oscillator. The frequency of the output sinusoidal waveform in the proposed structures is of the order of few Hz. In addition to this static power dissipation of the CMOS ring oscillator has been further improved in the proposed CMOS thyristor based ring oscillator.