Electricity: power supply or regulation systems – In shunt with source or load – Using a three or more terminal semiconductive device
Reexamination Certificate
2008-02-15
2009-11-10
Riley, Shawn (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using a three or more terminal semiconductive device
C323S283000, C327S361000
Reexamination Certificate
active
07615973
ABSTRACT:
Provided is an adder in which all of circuits can be constituted by CMOS transistors, a process is simplified, and a chip size can be reduced as compared with a conventional art. The adder according to the present invention includes: a first VI converter and a second VI converter that allow a current corresponding to an input voltage to flow therein; and a current addition resistor having one end commonly connected to output terminals of the first VI converter and the second VI converter and another end grounded, which is adjustable in a resistance value. Each of the first VI converter and the second VI converter includes: a prestage VI converter that generates a reference current; a poststage VI converter that generates a current corresponding to the input voltage; a first current mirror circuit whose first terminal on a reference side is connected with the prestage VI converter and whose first output terminal in which a current corresponding to the first terminal flows is connected with the poststage VI converter; and a second current mirror circuit whose second terminal on the reference side is connected to the first output terminal, and which can adjust a current ratio from a second output terminal in correspondence with the current that flows in the second terminal. A voltage at the one end of the current addition resistor is output as an addition voltage.
REFERENCES:
patent: 6597159 (2003-07-01), Yang
patent: 2002/0135345 (2002-09-01), Terashi
Adams & Wilks
Riley Shawn
Seiko Instruments Inc.
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