Input circuit for receiving a variable voltage input signal and method
US7358796B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2006 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Nov 22, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45352
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input voltage circuit comprises an input transistor having a control electrode for receiving a variable input voltage, a voltage detection transistor having a current electrode coupled to a current electrode of the input transistor forming a first node, and a current source coupled to a second current electrode of the voltage detection transistor forming a second node. The input voltage circuit further comprises a variable voltage drop transistor having a first current electrode coupled to the first node, a control electrode coupled to the second node and a second current electrode coupled to an output node, wherein the voltage detection transistor detects a variation in the variable input voltage and provides a signal to the variable voltage drop transistor. The variable voltage drop transistor generates a voltage drop proportional to the variation in the variable input voltage to ensure a substantially constant output at the output node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.