Adaptive impedance matching module

1. An apparatus, comprising:

a multi-band RF matching network coupled to a plurality of RF input ports and at least one RF output port in a communication device, the matching network comprising one or more controllable variable reactive elements, the communication device being configured for providing voice communications with another communication device; and

a voltage detector coupled to the RF output port via a voltage divider to determine a voltage at the RF output port and provide voltage information to a controller,

wherein the RF matching network is adapted to adjust RF power transferred from the RF input port to the RF output port by varying signals supplied to the controllable variable reactive elements to adjust the RF power at the RF output port,

wherein the controller generates one or more control signals responsive to the voltage information provided by the voltage detector, and

wherein the one or more controllable variable reactive elements are coupled to a bias driver circuit adapted to map the control signals that are output from the controller to a signal range that is compatible with the one or more controllable variable reactive elements in the RF matching network,

wherein the one or more controllable variable reactive elements comprise at least one of:

one or more reactive elements controlled by one or more semiconductor devices, wherein the one or more semiconductor devices are controlled by the one or more mapped control signals generated by the bias driver circuit;

one or more reactive elements controlled by one or more micro-electro-mechanical systems (MEMS) devices, wherein the one or more MEMS devices are controlled by the one or more mapped control signals; or

one or more reactive elements each having a controllable reactance, wherein the reactance of each of the one or more reactive elements is controlled by one of the one or more mapped control signals.

2. The apparatus of claim 1 , wherein the voltage divider comprises a network of resistors.

3. The apparatus of claim 1 , wherein the voltage divider comprises a network of capacitors.

4. The apparatus of claim 1 , wherein the voltage divider comprises a variable voltage divider.

5. The apparatus of claim 4 , wherein the variable voltage divider comprises a switchable network of resistors.

6. The apparatus of claim 4 , wherein the variable voltage divider comprises a switchable network of capacitors.

7. The apparatus of claim 4 , wherein the variable voltage divider is controlled by the controller.

8. The apparatus of claim 4 , wherein the variable voltage divider is controlled with one or more switches.

9. The apparatus of claim 8 , wherein the one or more switches comprise at least one of semiconductor switches or mechanical switches.

10. The apparatus of claim 1 , wherein the voltage detector comprises one of a diode detector or a logarithmic amplifier detector.

11. The apparatus of claim 1 , wherein the controller generates the control signals responsive to an operational state of the communication device.

12. The apparatus of claim 2 , wherein the mapped control signals generated by the bias driver circuit enable or disable one or more switches that control one or more reactances within the RF matching network.

13. The apparatus of claim 1 , wherein the RF matching network is adapted to reduce signal reflections from the variable load impedance.

14. The apparatus of claim 1 , wherein the bias driver circuit is adapted to generate at least one of analog or digital signals.

15. An apparatus, comprising:

one or more controllable variable reactive elements coupled to one or more first ports and at least one second port; and

a detector coupled to the second port to provide information to a controller of a communication device during a voice communication;

wherein the one or more controllable variable reactive elements are adapted to adjust power transferred from the first port to the second port by varying signals applied to the controllable variable reactive elements,

wherein the controller generates one or more control signals responsive to the information provided by the detector, and

wherein the controllable variable reactive elements are coupled to a circuit adapted to map the control signals that are output from the controller to a signal range that is compatible with the controllable variable reactive elements,

wherein at least a portion of the controllable variable reactive elements comprise at least one of:

one or more reactive elements controlled by one or more semiconductor devices, wherein the semiconductor devices are controlled by the mapped control signals generated by the circuit;

one or more reactive elements controlled by one or more micro-electro-mechanical systems (MEMS) devices, wherein the MEMS devices are controlled by the mapped control signals; or

one or more reactive elements each having a controllable reactance, wherein the reactance of each of the reactive elements is controlled by one of the mapped control signals.

16. The apparatus of claim 15 , wherein the detector is a voltage detector.

17. A non-transitory machine-readable storage medium, comprising computer instructions to:

receive signal information sampled by a detector at a port of a matching network of a communication device during a voice communication with another communication device; and

vary control signals that change one or more reactances within the matching network based at least in part on the information,

wherein the matching network comprises one or more controllable variable reactive elements, and

wherein the matching network is coupled to a circuit adapted to map the control signals to a signal range that is compatible with the controllable variable reactive elements,

wherein the controllable variable reactive elements comprise at least one of:

one or more reactive elements controlled by one or more semiconductor devices, wherein the semiconductor devices are controlled by the mapped control signals generated by the circuit;

one or more reactive elements controlled by one or more micro-electro-mechanical systems (MEMS) devices, wherein the MEMS devices are controlled by the mapped control signals; or

one or more reactive elements each having a controllable reactance, wherein the reactance of each of the reactive elements is controlled by one of the mapped control signals.

18. The non-transitory machine-readable storage medium of claim 17 , comprising computer instructions to generate the control signals based at least in part on an operational state of the communication device.

19. The non-transitory machine-readable storage medium of claim 18 , wherein the voltage divider comprises a network of resistors.

20. The non-transitory machine-readable storage medium of claim 18 , wherein the voltage divider comprises a network of capacitors.