Patent ID: 6788042
Filing Date: 2004-09-07
Classification: H03H,H03M

Abstract:
An impedance network, comprising:at least one end terminal; a wiper terminal providing a tap position at a selected impedance value of the impedance network, selectable at a specified increment value, said wiper terminal selectable as an end terminal; a center impedance element; a first plurality of impedance elements configured to provide a range of impedance values with less number of wiper switching elements than for an impedance network with impedance elements having a uniformly selected increment value, the first plurality of impedance elements connected in series in a mirrored configuration about the center impedance element, wherein said first plurality of impedance elements includes a plurality of connection nodes which enables said first plurality of impedance elements to be connected in series, said first plurality of impedance elements includes a first plurality of wiper switching elements to selectively couple said plurality of connection nodes to the wiper terminal, said first plurality of wiper switching elements includes a plurality of transistors, and on/off states of said plurality of transistors are in a mirrored configuration around the center impedance element.