Patent ID: 11867750
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A process variation detection circuit, arranged in a chip, and comprising:
a first ring oscillator, wherein a first number of auxiliary elements of a preset type are arranged between two adjacent inverters of the first ring oscillator; and
a second ring oscillator, wherein a second number of auxiliary elements of a preset type are arranged between two adjacent inverters of the second ring oscillator, the second number is larger than the first number;
wherein, a number of the inverters of the first ring oscillator is the same as a number of the inverters of the second ring oscillator; a type and a size of a transistor of the first ring oscillator are the same as a type and a size of a transistor of the second ring oscillator; and a type and a connection mode of each of the auxiliary elements correspond to element parameters to be measured of the chip.