a process corner detection circuit based on a self - timing oscillation ring comprises a reset circuit , the self - timing oscillation ring , and a counting module . the self - timing oscillation ring consists of m two - input miller units and inverters , and a two - input and gate , m being a positive integer greater than or equal to 3 . the circuit can be used for detecting a process corner of a fabricated integrated circuit chip , and reflecting the process corner of the chip according to the number of oscillations of the self - timing oscillation ring . the number of oscillations of the self - timing oscillation ring in different process corners is acquired by hspice simulation before the chip tape - out , and the process corner of the chip after the chip tape - out can be determined according to the actually measured number of oscillations .