Electricity: power supply or regulation systems – Output level responsive – Using an impedance as the final control device
Reexamination Certificate
2006-07-04
2006-07-04
Sterrett, Jeffrey (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using an impedance as the final control device
C323S313000, C323S354000
Reexamination Certificate
active
07071669
ABSTRACT:
A reference voltage generation circuit includes first to third resistance ladder circuits. The first resistance ladder circuit has at least one variable resistance circuit in which a resistance value between both ends is variable, and outputs multi-valued reference voltages. The second resistance ladder circuit has series-connected resistance circuits each of which has a fixed resistance value, and outputs a plurality of reference voltages. The third resistance ladder circuit has at least one variable resistance circuit in which a resistance value between both ends is variable, and outputs multi-valued reference voltages. The first to third resistance ladder circuits are connected in series between first and second power supply lines. The resistance values of the variable resistance circuits in the first and third resistance ladder circuits are variably controlled by a given command or a variable control signal input through an external input terminal.
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Oliff & Berridg,e PLC
Seiko Epson Corporation
Sterrett Jeffrey
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