Patent ID: 6882136

Claim:
An impedance network comprising: a first plurality of impedance elements coupled in series, the series connection having at least one center impedance element, an impedance element at each end of the series connection of the first plurality of impedance elements, and equal pluralities of impedance elements between each end impedance element and the at least one center impedance element; a second plurality of impedance elements; a first plurality of switching elements each coupled in series with a respective one of the second plurality of impedance elements, each series connection of one of the second plurality of impedance elements and a respective one of the first plurality of switching elements being coupled in parallel with a respective one of the pluralities of first impedance elements between each end impedance element and the at least one center impedance element of the series connection of first impedance elements; a wiper terminal; and, a second plurality of switching elements coupled between nodes between impedance elements in the first plurality of impedance elements and the wiper terminal.