Voltage generator for generating a stable voltage independent of variations in the ambient temperature and of variations in the supply voltage
USRE34772E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | May 7, 1993 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | May 7, 2013 |
Classification
- Technology area (CPC —)General
Abstract
A stable reference voltage generator using a current mirror circuit comprising a primary branch and a secondary branch, is shown and described. A first bipolar transistor (Q1) has its collector connected in series with the primary branch of the current mirror, and a voltage divider bridge comprising at least two series-connected resistors (R1, R2), is connected in series between the secondary branch of the current mirror and the collector of a second bipolar transistor (Q2). The base of the second transistor (Q2) is connected to the common point of the series resistors, the base of the first transistor (Q1) is connected to the collector of the second transistor (Q2), and the output of the generator (V.sub.REF) is connected to the terminal of the bridge opposite that connected to the collector of the second transistor (Q.sub.2). The geometry of said transistors being such that the first transistor (Q1) is equivalent to "N" transistors identical to the second transistor (Q2) connected in parallel. An isolation bipolar transistor (Q7) is connected in series between the primary branch of the current mirror circuit and the first transistor, the collector of the latter being connect to t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.