Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2011-01-18
2011-01-18
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S543000
Reexamination Certificate
active
07872519
ABSTRACT:
Provided is a voltage divider circuit for dividing an input voltage in accordance with a predetermined ratio with high accuracy, in which a source current does not flow from a voltage source and a sink current does not flow into the voltage source. The voltage divider circuit according to the present invention includes: a first resistor; a constant current circuit for outputting a current flowing through the first resistor correspondingly to an input voltage as a constant current; a first current mirror circuit, in which the constant current becomes an input current, for outputting a first output current; a second current mirror circuit, in which the first output current becomes an input current, for outputting a second output current; and a second resistor connected to an output terminal to which the second output current of the second current mirror circuit is output, in which a divided voltage, which is a potential difference between both ends of the second resistor, is adjusted by a current mirror ratio between the first current mirror circuit and the second current mirror circuit, and a resistance ratio between the second resistor and the first resistor.
REFERENCES:
patent: 5300837 (1994-04-01), Fischer
patent: 6686798 (2004-02-01), Gaggl
patent: 6979990 (2005-12-01), Lee
patent: 2006/0001476 (2006-01-01), Yanagisawa et al.
patent: 2-250514 (1990-10-01), None
Brinks Hofer Gilson & Lione
Seiko Instruments Inc.
Tra Quan
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