Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-01-03
2006-01-03
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S541000
Reexamination Certificate
active
06982590
ABSTRACT:
A bias current generating circuit including a bandgap reference circuit which outputs a first voltage which is constant, and a second voltage which changes in accordance with a temperature. The generating circuit also includes a first low-potential-side constant-current source circuit which receives the second voltage, and outputs a first electric current dependent on a temperature, and a second low-potential side constant-current source circuit which receives the first voltage, and outputs a second electric current independent of a temperature. A third low-potential-side constant-current source circuit in the generating circuit receives the first voltage, and supplies a third temperature-independent current. A high-potential-side constant-current source circuit receives a third voltage and outputs a fourth electric current independent of a temperature. A current mirror circuit then generates a bias current in accordance with an electric current supplied from a reference current terminal to which the first, second and third supply terminals are connected.
REFERENCES:
patent: 5109187 (1992-04-01), Guliani
patent: 5631600 (1997-05-01), Akioka et al.
patent: 5774013 (1998-06-01), Groe
patent: 2004/0207379 (2004-10-01), Camara et al.
patent: 2000-224250 (2000-09-01), None
Maxim Printed Data Sheet (19-2194; Rev. 1; Rev. Mar. 25, 2002), 17 pages http://www.maxim-ic.com/quick-view2.cfm/qv-pk/3165.
Cunningham Terry D.
Kabushiki Kaisha Toshiba
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