PWM control of analog front end

A wireless power transmitter comprising:

• a first field-effect transistor;
• a second field-effect transistor;
• a third field-effect transistor;
• a fourth field-effect transistor;
• a coil, the wireless power transmitter being configured to drive the coil based at least in part on activations of the first, second, third and fourth field-effect transistors;
• and
• an analog front end comprising:
• a first driver corresponding to the first field-effect transistor and being configured to control activation of the first field-effect transistor;
• a second driver corresponding to the second field-effect transistor and being configured to control activation of the second field-effect transistor;
• a third driver corresponding to the third field-effect transistor and being configured to control activation of the third field-effect transistor;
• and
• a fourth driver corresponding to the fourth field-effect transistor and being configured to control activation of the fourth field-effect transistor,
• wherein the activation of at least one of the first field-effect transistor and the fourth field-effect transistor is controlled based at least in part on a first pulse-width modulation signal;
• and
• wherein the activation of at least one of the second field-effect transistor and the third field-effect transistor is controlled based at least in part on a second pulse-width modulation signal.

A wireless power transmitter comprising:

• a coil;
• a plurality of field-effect transistors that are configured to drive the coil;
• an analog front end that is configured to control activations of the plurality of field-effect transistors;
• and
• a controller that is configured to provide an unencoded pulse-width modulation signal to the analog front end, the analog front end being configured to control the activation of at least one of the field-effect transistors based at least in part on the unencoded pulse-width modulation signal.