Detecting circuit for a power source voltage
US4309627A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1979 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | Mar 27, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C10/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detecting circuit for a power source voltage comprises a reference voltage generating circuit for generating a reference voltage, a voltage dividing circuit for dividing the power source voltage, and a voltage comparing circuit having one input terminal connected to receive the reference voltage from the reference voltage generating circuit and another input terminal connected to receive the divided voltage from the voltage dividing circuit. In one embodiment, the reference voltage generating circuit comprises at least two MOS-transistors having different threshold voltages and having the same polarity, one of the MOS-transistors having its gate and drain connected together with the drain being connected to the gate of the other MOS-transistor, the drain and source of the other MOS-transistor each being connected to a resistor, and the drain of the other MOS-transistor being connected to one input terminal of the voltage comparing circuit. In another embodiment, the reference voltage generating circuit comprises a P-channel MOS-transistor having its drain connected to the drain of the N-channel MOS-transistor and the gates of the P-channel and N-channel MOS-transistors being conn…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.