RC oscillating circuit with wide voltage range and low temperature drift

The invention belongs to the technical field of RC oscillating circuits, and particularly provides a wide-voltage-range low-temperature-drift RC oscillating circuit which comprises a vref standard circuit, an RC charging and discharging circuit and a comparator circuit. The vref standard circuit comprises an operational amplifier and a vref generating circuit, and the vref generating circuit is generated by connecting a resistor string between a power supply vdda and the ground; the positive input end of the operational amplifier is connected with vref, and the negative input end of the operational amplifier is electrically connected with the RC charging and discharging circuit through a switch; the output end vopa of the operational amplifier is electrically connected with the positive input end of the comparator circuit, and the negative input end of the comparator circuit is electrically connected with the RC charging and discharging circuit through a switch. According to the scheme, the calibration precis