RC oscillator with stable frequency

• Main Authors: HAO YUNHAN, LI SHIBIN, NIU CHENGYU, PAN LEI, GOU YINBAO
• Format: Patent
• Language: Chinese; English
• Published: 18.01.2022
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; GENERATION OF NOISE BY SUCH CIRCUITS; GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER

The invention discloses an RC oscillator with stable frequency, which is an RC oscillator with low temperature drift and high power supply rejection ratio, has the characteristics of simple structure, small influence by temperature and power supply voltage and stable frequency, and comprises a reference generation circuit used for generating fixed bias current and bias voltage, and the bias voltage is generated by the bias current flowing through a bias resistor; an oscillation generating circuit is used for generating a periodic signal of which the frequency is only related to the resistance and the capacitance by utilizing the reference of the reference generating circuit; a feedback adjustment circuit is used for adjusting the comparison reference voltage of the comparator according to the time delay change of the comparator in the oscillation generation circuit and eliminating the influence of the time delay of the comparator; a logic circuit is used for receiving a signal of the oscillation generation ci