| US 7,525,370 B2 | ||
| Circuits for generating a reference voltage | ||
| Hugo Gicquel, Grenoble (France); Jean-Luc Moro, Grenoble (France); and Marc Sabut, Eybens (France) | ||
| Assigned to STMicroelectronics S.A., Montrouge (France) | ||
| Filed on Mar. 15, 2007, as Appl. No. 11/724,474. | ||
| Claims priority of application No. 06 50876 (FR), filed on Mar. 15, 2006. | ||
| Prior Publication US 2007/0216472 A1, Sep. 20, 2007 | ||
| Int. Cl. G05F 1/10 (2006.01) | ||
| U.S. Cl. 327—538 [327/540; 327/541] | 14 Claims |
| 1. A circuit of generation of a reference voltage by a first MOS transistor of a first channel type connected to a first terminal
of application of a supply voltage, said first transistor being in series with a second MOS transistor of the same channel
type controlled by an input stage of a transconductance amplifier, a junction point of the first and second transistors defining
an output terminal providing the reference voltage, comprising:
a first current source of fixed value connecting said first supply terminal to a gate of the first transistor;
a second current source of fixed value connecting the second transistor to a second terminal of application of the supply
voltage;
at least one third MOS transistor of a second channel type connecting the first and second current sources; and
a capacitive element directly connecting said output terminal to a conduction terminal of the third transistor to vary the
conduction of the third transistor in case of a variation in the output voltage.
|