JFET pinch off voltage proportional reference current generating circuit
US4716356A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1986 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | Dec 19, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/245
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A circuit for generating a reference current proportional over temperature to the pinch-off voltage of a first JFET includes second and third JFETS and first and second resistors. The second JFET has its gate coupled to its source and produces a current which drives the first JFET. Since the width-to-length ratio of the second JFET is greater than that of the first, a negative gate-to-source voltage of the first JFET is produced across the first resistor. The third JFET has a source coupled via the second resistor to the gate of the first JFET and has a gate coupled to the drain of the first JFET for setting the voltage thereat. The reference current appears at the drain of the third JFET.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.