Low voltage detecting circuit for detecting input power of a modem
US6661258B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 21, 2002 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Aug 21, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/16538
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A low voltage detecting circuit includes a first transistor having a first electrode electrically coupled to a reference voltage, a control electrode electrically coupled to the input power voltage, and a second electrode. The low voltage detecting circuit also has a second transistor having a first electrode electrically coupled to a logic high voltage, a control electrode electrically coupled to the second electrode of the first transistor, and a second electrode electrically coupled to a logic low voltage. When the input power voltage drops below the predetermined voltage, the voltage at the control electrode of the first transistor drops below the reference voltage to turn on the first transistor and consequently the second transistor so that a logic low signal is output from the first electrode of the second transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.