Design of Oscillator of DC/DC Converter

Oscillator is an important component of the DC/DC,the oscillator is relaxation oscillator of double comparator and constant current charging and discharging.The output is pulse and sawtooth wave,it is made up of constant current source,capacitance,comparator,RS flip-flops,etc.In order to improve the speed of the comparator,a diode connected NMOS in the circuit is added.In order to reduce the impact on the reference voltage circuit,a unique base current compensation circuit is designed.