Patent ID: 7046055
Filing Date: 2006-05-16
Classification: H03K

Abstract:
1. A voltage detection circuit for detecting the voltage level of a first power source, the voltage detection circuit comprising: a first MOS transistor comprising a first gate, a first source, and a first drain coupled to the first gate; a second MOS transistor comprising a second gate, a second source, and a second drain coupled to the second gate; a comparator comprising a first input terminal, a second input terminal coupled to the second drain, and an output terminal; a first resistor coupled between the first input terminal and the first drain; a second resistor coupled to the first power source; a third resistor coupled between the second resistor and the first input terminal; a fourth resistor coupled between the second resistor and the second input terminal; a fifth resistor coupled between a connection point of the first source and the second source, and a second power source; and a positive temperature coefficient device coupled to the fifth resistor in parallel, wherein a current passing through the positive temperature coefficient device is increased incrementally as temperature increases.