Transmitter circuit and method with energy conversion in nonlinear electromechanical matching network

A transmitter system comprising:

• a load having a resonant frequency;
• a transmitter terminal that provides an impedance matched signal comprising a center frequency that resonates the load at the resonant frequency;
• a drive circuit configured to provide a drive signal having a signal amplitude and a signal frequency comprising the center frequency;
• an electromechanical matching network configured to provide an electromechanical matching signal comprising the center frequency and a plurality of non-center frequencies in response to the drive signal;
• and
• an energy recovery circuit configured to extract an energy recovery signal from the electromechanical matching signal and to supply a recovered voltage signal from the energy recovery signal to the drive circuit;
• wherein:
• the energy recovery signal represents at least one non-center frequency from the plurality of non-center frequencies;
• and
• the impedance matched signal represents the electromechanical matching signal excluding the energy recovery signal.

A method of matching impedance to a load having a resonant frequency, the method comprising the steps of:

• providing a drive signal from a drive circuit, the drive signal having a signal amplitude and a signal frequency comprising a center frequency;
• configuring an electromechanical matching network to provide an electromechanical matching signal comprising the center frequency and a plurality of non-center frequencies in response to the drive signal;
• extracting an energy recovery signal from the electromechanical matching signal, wherein the energy recovery signal represents at least one non-center frequency from the plurality of non-center frequencies;
• using the energy recovery signal to supply a recovered voltage signal to the drive circuit;
• and
• providing an impedance matched signal comprising the center frequency that resonates the load at the resonant frequency, wherein the impedance matched signal represents the electromechanical matching signal excluding the energy recovery signal.