Patent ID: 11860217
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A test circuit, comprising:
M stages of test units, the test unit in each stage having a first terminal, a second terminal, a third terminal, and a fourth terminal, the first terminal of the test unit in each stage being connected to a power wire, the second terminal of the test unit in each stage being connected to a ground wire, the third terminal of the test unit in a first stage of the stages being connected to the power wire, and the third terminal of the test unit in an ith stage of the stages being connected to the fourth terminal of the test unit in an (i−1)th stage of the stages; wherein, the M and the i are positive integers greater than or equal to 2;
wherein the test unit in each stage comprises an electro-migration test element, a switch, and a control circuit, wherein a first terminal of the electro-migration test element is the first terminal of the test unit, a second terminal of the electro-migration test element is connected to a first terminal of the switch and a first terminal of the control circuit, a control terminal of the switch is the third terminal of the test unit, a second terminal of the switch is the second terminal of the test unit, and a second terminal of the control circuit is the fourth terminal of the test unit.