Resistor tuning network and method for microelectronic RC-based filters
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United States of America Patent
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Jun 3, 2003
Grant Date -
Oct 3, 2002
app pub date -
Feb 7, 2001
filing date -
Feb 7, 2001
priority date (Note) -
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Abstract
A resistor tuning network for an RC filter has a first, fixed resistor and a second, variable resistance connected in parallel with the fixed resistor. The variable resistance is an R-2R ladder circuit 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 are selectively connected between the respective nodes and the first or second output terminal. Each shunt arm has a 2R resistor and a switch in series, and each switch has a first, closed position connecting the shunt arm to the first output terminal and a second, open position connecting the shunt arm to the second output terminal, such that the resistance of the ladder network is varied dependent on the switch positions and is at a maximum value when all switches are closed and a minimum value when all switches are open. The overall resistance is tuned by varying the switch positions in the ladder circuit.
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