Method and apparatus for adapting a variable impedance network
View Patent ↗The present disclosure may include, for example, a tunable capacitor having a decoder for generating a plurality of control signals, and an array of tunable switched capacitors comprising a plurality of fixed capacitors coupled to a plurality of switches. The plurality of switches can be controlled by the plurality of control signals to manage a tunable range of reactance of the array of tunable switched capacitors. Additionally, the array of tunable switched capacitors is adapted to have non-uniform quality (Q) factors. Additional embodiments are disclosed.
1. A device comprising:
a tunable array of switched capacitors comprising a plurality of capacitors coupled to a plurality of switches, each of the plurality of capacitors having a fixed capacitance value, each of the plurality of switches having a resistance associated therewith;
wherein the capacitance values of the plurality of capacitors comprise a non-binary array, and
wherein the array of switched capacitors is adapted to have non-uniform quality (Q) factors.
2. The device of claim 1 , wherein each combination of a capacitor of the plurality of capacitors and a switch of the plurality of switches has a quality (Q) factor, and the array corresponds to a plurality of combinations having different Q factors.
3. The device of claim 1 , wherein a first capacitor and a second capacitor of the array of switched capacitors each have a capacitance value equal to a largest capacitance value of the non-binary array.
4. The device of claim 1 ,
wherein the device comprises a matching network operating in a frequency range having a low-frequency portion and a high-frequency portion,
wherein a first capacitor having a capacitance value equal to a largest capacitance value of the array is connected to a first resistance of a first switch to maintain a target quality (Q) factor for the matching network while operating in the low-frequency portion of the frequency range, and is not connected to the first resistance while the matching network is operating in the high-frequency portion of the frequency range.
5. The device of claim 1 , wherein at least a portion of the array of switched capacitors is contained on a die.
6. The device of claim 1 , wherein the resistance associated with at least one switch of the plurality of switches comprises a parasitic resistance.
7. The device of claim 1 , wherein at least one switch of the plurality of switches comprises a semiconductor switch.
8. The device of claim 1 , wherein at least one switch of the plurality of switches comprises a micro-electro-mechanical systems (MEMS) switch.
9. A device comprising:
a tunable array of switched capacitors comprising a plurality of capacitors coupled to a plurality of switches, each of the plurality of capacitors having a fixed capacitance value, each of the plurality of switches having a resistance associated therewith,
wherein the array of switched capacitors is adapted to have non-uniform quality (Q) factors, the array of switched capacitors thereby adapted to maintain a Q factor for the array over a predetermined portion of a frequency range of the device.
10. The device of claim 9 , wherein each combination of a capacitor of the plurality of capacitors and a switch of the plurality of switches has a Q factor, and the array corresponds to a plurality of combinations having different Q factors.
11. The device of claim 9 ,
wherein the device comprises a matching network operating in the frequency range, the frequency range having a low-frequency portion and a high-frequency portion,
wherein a first capacitor having a capacitance value equal to a largest capacitance value of the array is connected to a first resistance of a first switch to maintain a target quality (Q) factor for the matching network while operating in the low-frequency portion of the frequency range, and is not connected to the first resistance while the matching network is operating in the high-frequency portion of the frequency range.
12. The device of claim 9 , wherein at least a portion of the array of switched capacitors is contained on a die.
13. The device of claim 9 , wherein the resistance associated with at least one switch of the plurality of switches comprises a parasitic resistance.
14. The device of claim 9 , wherein at least one switch of the plurality of switches comprises a semiconductor switch.
15. The device of claim 9 , wherein at least one switch of the plurality of switches comprises a micro-electro-mechanical systems (MEMS) switch.
16. A device comprising:
a tunable array of switched reactive elements comprising a plurality of reactive elements coupled to a plurality of switches, each of the plurality of reactive elements having a fixed reactance value, each of the plurality of switches having a resistance associated therewith,
wherein the array of switched reactive elements is adapted to have non-uniform quality (Q) factors, the array of switched reactive elements thereby adapted to maintain a Q factor for the array over a predetermined portion of a frequency range of the device.
17. The device of claim 16 , wherein at least one switch of the plurality of switches comprises a semiconductor switch.
18. The device of claim 16 , wherein at least one switch of the plurality of switches comprises a micro-electro-mechanical systems (MEMS) switch.
19. The device of claim 16 , wherein the array comprises a plurality of capacitors coupled to the plurality of switches, wherein each of the plurality of switches has a parasitic capacitance, and wherein the resistance associated with at least one switch of the plurality of switches comprises a parasitic resistance.
20. The device of claim 19 ,
wherein the device comprises a matching network operating in the frequency range, the frequency range having a low-frequency portion and a high-frequency portion,
wherein a first capacitor having a capacitance value equal to a largest capacitance value of the plurality of capacitors is connected to a first resistance of a first switch to maintain a target Q factor for the matching network while operating in the low-frequency portion of the frequency range, and is not connected to the first resistance while the matching network is operating in the high-frequency portion of the frequency range.