Patent ID: 8339171

Claim:
A threshold voltage detection circuit comprising: a first inverter having a first terminal and a second terminal; a first transistor having a first electrode, a second electrode and a third electrode, the first electrode is electrically connected with the second terminal of the first inverter; a second transistor having a fourth electrode, a fifth electrode and a sixth electrode, the fourth electrode is electrically connected with the first terminal of the first inverter; a third transistor having a seventh electrode, an eighth electrode and a ninth electrode, the seventh electrode is electrically connected with the second terminal of the first inverter and the first electrode of the first transistor; and a fourth transistor having a tenth electrode, an eleventh electrode and a twelfth electrode, the tenth electrode is electrically connected with the third electrode of the first transistor and the fifth electrode of the second transistor, and the eleventh electrode is electrically connected with the ninth electrode of the third transistor.