Automatic impedance matching using true power information

Abstract

Aspects of this disclosure relate to systems and methods of performing dynamic impedance tuning. Certain aspects may be performed by or include a dynamic impedance matching network. The dynamic impedance matching network can determine a desired output power for a power amplifier, true power information for the power amplifier, and an output power delivered to a load by the power amplifier. In addition, the dynamic impedance matching network can determine whether the output power satisfies the true power information. Responsive to this determination, the dynamic impedance matching network may modify a load line impedance for the power amplifier using an impedance tuning network.

1 . (canceled) 
     
     
         2 . A dynamic impedance matching network comprising:
 an impedance tuning network including a plurality of configurable elements; and   an impedance tuning network controller electrically coupled to a power measurement device configured to measure a forward power value at a first node of the impedance tuning network, the impedance tuning network controller configured to configure the plurality of configurable elements, the impedance tuning network controller including an optimization state machine configured to specify one or more configurable elements from the plurality of configurable elements to configure based at least in part on the forward power value and a reflected power value of a power amplifier in communication with the impedance tuning network.   
     
     
         3 . The dynamic impedance matching network of  claim 2  further comprising the power measurement device. 
     
     
         4 . The dynamic impedance matching network of  claim 2  wherein the power measurement device includes a coupler in electrical communication with the first node of the impedance tuning network and a detector in electrical communication with the coupler. 
     
     
         5 . The dynamic impedance matching network of  claim 4  wherein the first node of the impedance tuning network is coupled to a first trace of the coupler, and the detector is coupled to a second trace of the coupler. 
     
     
         6 . The dynamic impedance matching network of  claim 4  wherein a combination of the coupler and the detector determines the forward power value measured by the power measurement device. 
     
     
         7 . The dynamic impedance matching network of  claim 2  wherein the power amplifier is in communication with a second node of the impedance tuning network that differs from the first node. 
     
     
         8 . The dynamic impedance matching network of  claim 2  wherein the plurality of configurable elements include a plurality of switched capacitors and the impedance tuning network controller configures the one or more configurable elements by modifying a state of at least one switch of the plurality of switched capacitors. 
     
     
         9 . The dynamic impedance matching network of  claim 2  wherein the impedance tuning network further includes an inductor electrically connected between a first set of configurable elements from the plurality of configurable elements and a second set of configurable elements from the plurality of configurable elements. 
     
     
         10 . The dynamic impedance matching network of  claim 2  wherein the impedance tuning network is configured to modify a load line impedance between the power amplifier and an antenna. 
     
     
         11 . The dynamic impedance matching network of  claim 2  wherein a state of the optimization state machine is selected based at least in part on a power of the power amplifier. 
     
     
         12 . The dynamic impedance matching network of  claim 11  wherein the power of the power amplifier is a power provided to a collector of a transistor of the power amplifier. 
     
     
         13 . The dynamic impedance matching network of  claim 11  wherein the power of the power amplifier is a product of a sense current and a supply voltage. 
     
     
         14 . The dynamic impedance matching network of  claim 2  wherein the impedance tuning network controller configures the one or more configurable elements based at least in part on a result of a comparison between an expected power and the forward power value. 
     
     
         15 . A wireless device comprising:
 a power amplifier module including a power amplifier; and   an impedance matching system including an impedance tuning network and an impedance tuning network controller, the impedance tuning network including a plurality of configurable elements, the impedance tuning network controller electrically coupled to a power measurement device configured to measure a forward power value at a first node of the impedance tuning network, the impedance tuning network controller configured to configure the plurality of configurable elements, the impedance tuning network controller including an optimization state machine configured to specify one or more configurable elements from the plurality of configurable elements to configure based at least in part on the forward power value and a reflected power value of the power amplifier.   
     
     
         16 . The wireless device of  claim 15  wherein the power measurement device includes a coupler in electrical communication with the first node of the impedance tuning network and a detector in electrical communication with the coupler. 
     
     
         17 . The wireless device of  claim 16  wherein a combination of the coupler and the detector determines the forward power value measured by the power measurement device. 
     
     
         18 . The wireless device of  claim 15  wherein the power amplifier is in communication with a second node of the impedance tuning network that differs from the first node. 
     
     
         19 . The wireless device of  claim 15  wherein the plurality of configurable elements include a plurality of switched capacitors and the impedance tuning network controller configures the one or more configurable elements by modifying a state of at least one switch of the plurality of switched capacitors. 
     
     
         20 . The wireless device of  claim 15  wherein the impedance tuning network further includes an inductor electrically connected between a first set of configurable elements from the plurality of configurable elements and a second set of configurable elements from the plurality of configurable elements. 
     
     
         21 . A method of dynamically configuring an impedance tuning network, the method comprising:
 determining an expected power for a power amplifier based on a collector current provided to the power amplifier, a collector voltage applied to the power amplifier, and an efficiency value for the power amplifier;   measuring an output power delivered to a load by the power amplifier;   determining that the output power does not satisfy the expected power; and   modifying a load line impedance for the power amplifier by adjusting a configuration of at least one configurable elements of a plurality of configurable elements of an impedance tuning network based at least in part on an optimization state machine.