Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2005-08-30
2005-08-30
Tokar, Michael (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S144000, C341S155000
Reexamination Certificate
active
06937179
ABSTRACT:
A resistor tuning network is disclosed that comprises a first resistor connected in parallel with a second variable resistor and a third resistor coupled in series with the first resistor and the second variable resistor. The second variable resistor comprises an R-2R ladder network having an input and first and second output terminals, with a first line having a plurality of first arms connected in series with the input and first output terminal and nodes between each pair of arms, each arm having an identical resistor R. A series of shunt arms, each with a 2R resistor and a switch, are selectively connected between the respective nodes and the first or second output terminal. The resistance of the resistor tuning network is tuned by varying the switch positions in the shunt arms in the R-2R ladder network.
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Alzaher, H.A., et al.; “Digitally Tuned Analogue Integrated Filters Using R-2R Ladder”; Electronics Letters; Jul. 20th, 2000; vol. 36, No. 15; pp. 1278-1280.
Mai Lam T.
National Semiconductor Corporation
Tokar Michael
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