Voltage source circuit with selectable temperature independent and temperature dependent voltage outputs
US7112948B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2005 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | May 17, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A voltage source includes first and second pn junctions which conduct the outputs of respective current sources to establish respective base-emitter voltages Vbe1 and Vbe2 at respective nodes; Vbe1 and Vbe2 can each be generated with a current I or a current N*I. An amplifier A1 has its non-inverting input connected to the second node and its inverting input connected to the first node through an input capacitor; a feedback capacitor is connected between the inverting input and a third node. Switches are connected between A1's inverting input and A1's output, between the third node and A1's output, and between the third node and a circuit common point. A control circuit operates the switches and current sources during first and second operating phases to selectively produce a temperature independent output voltage or a temperature dependent output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.