Patent ID: 6331768
Filing Date: 2001-12-18
Classification: H03H

Abstract:
A potentiometer network comprising:a first main terminal and a second main terminal;a first variable resistance network comprising a first terminal, a second terminal, and a first variable resistance value (R.sub.1) which varies between zero ohms and a first resistance level (R.sub.P), the first terminal of the first variable resistance network being coupled to the first main terminal;a second variable resistance network comprising a first terminal, a second terminal, and a second variable resistance value (R.sub.2) which is substantially equal to the difference between the first resistance level and the first variable resistance value, the first terminal of the second variable resistance network being coupled to the second main terminal;a resistor stack comprising a first plurality of resistors coupled in series to one another at a second plurality of internal nodes, each internal node coupling two adjacent resistors of the stack, the first resistor in the stack having a terminal coupled to the second terminal of the first variable resistance network, the last resistor in the stack having a terminal coupled to the second terminal of the second variable resistance network, each resistor having a value substantially equal to a second resistance level (R.sub.S); anda wiper terminal coupled to one of the plurality of internal nodes of the resistor stack, or to one of the second terminals of the variable resistor networks, or to one of the first and second main terminals; andwherein said first resistance level (R.sub.P) has a value which is in a range spanning from seventy-five percent of said second resistance level (R.sub.S) to one-hundred-and-twenty-five percent of said second resistance level (R.sub.S).