Patent ID: 7332980

Claim:
An impedance matching system comprising: a digitally tunable impedance matching network having a maximum capacitance C, the network including: a first capacitor having a fixed plate and a moveable plate configured to be in a first position or a second position, wherein the first capacitor provides a predefined value of capacitance C/2 when the movable plate is in the first position and an open circuit when the movable plate is in the second position; and a second capacitor coupled in parallel to the first capacitor and having a fixed plate and a moveable plate configured to be in a first position or a second position, wherein the second capacitor provides a predefined value of capacitance equal to approximately C/2 n (where n>=2) when the movable plate is in the first position and an open circuit when the movable plate is in the second position; and a digital controller coupled to the first and second capacitors and configured to actuate the moveable plate of one or both of the first and second capacitors to produce a capacitance in the range of zero to (C/2)+(C/2 n ).