Variable temperature coefficient level shifting circuit and method
US4460865A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1982 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Aug 30, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/907
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A variable temperature coefficient level shifter includes a circuit which generates a voltage V.sub.BE having a negative temperature coefficient and a voltage .DELTA.V.sub.BE having a positive temperature coefficient. A control current is generated by placing a first resistor between V.sub.BE and ground and a second resistor between .DELTA.V.sub.BE and ground. Each of these currents forms a component of the control current which then has some net temperature coefficient. By properly scaling the resistors the control current may have any desired temperature coefficient between 2800 ppm and 3000 ppm. Once the temperature coefficient is set, a third resistor is provided through which the control current flows. The amplitude of the shift is then selected by selecting the value of resistor R.sub.S.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.