Patent ID: 7602327
Filing Date: 2009-10-13
Classification: H01C

Abstract:
1. A digitally controllable resistor comprising: a substrate; at least one digitally controllable resistance stage formed on said substrate, each of said at least one stages including: wherein said at least one digitally controllable resistance stage includes a plurality of digitally controllable resistance stages connected to one another in series and further wherein said control line provides a control word having a bit associated with each of said plurality of digitally controllable resistance stages; wherein a total resistance of the digitally controllable resistor changes substantially linearly with a value of the control word; wherein for each of said plurality of digitally controllable resistance stages n, a resistance value of said first resistor (R and a resistance value of said second resistor (R n,up ) is calculated as where R min is a minimum total resistance of said digitally controllable resistor, ΔR is a step resistance of said digitally controllable resistor, N is a number of said plurality of digitally controllable resistance stages and R switch is an on resistance of said switch.