Coded data generation or conversion – Converter calibration or testing – Trimming control circuits
Reexamination Certificate
2006-05-23
2006-05-23
Nguyen, John B (Department: 2819)
Coded data generation or conversion
Converter calibration or testing
Trimming control circuits
C341S145000, C341S120000
Reexamination Certificate
active
07049985
ABSTRACT:
Trimming by disconnecting a fuse connected in parallel to a feedback resistor of an amplifier circuit would cause a variation in voltage value due to a remaining resistance component. A voltage generator circuit is provided therein with a D/A converter circuit of an R-2R ladder resistor network type circuit. The D/A converter circuit is provided with a first switch circuit to an eighth switch circuit, corresponding to each bit, which are switched to set a digital value. Each switch circuit, which is provided with a fuse for providing a fixed voltage value, allows the fuse to be disconnected to fix the voltage value to a value obtained by inverting the initial value. The setting circuit controls the switching operation of each switch circuit, thereby simulating an electrical state of a fuse being disconnected before the fuse is actually disconnected.
REFERENCES:
patent: 4689494 (1987-08-01), Chen et al.
patent: 5446407 (1995-08-01), Yamamoto
patent: 6307490 (2001-10-01), Litfin et al.
patent: 2000-150799 (2000-05-01), None
Kagemoto Noboru
Karasawa Yoshiyuki
Yokomizo Ichiro
Canton Colburn LLP
Nguyen John B
Rohm & Co., Ltd.
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