Active transmitter ringdown for switching power amplifier

A transmitter for an electronic article surveillance (EAS) system, said transmitter configured to output a transmission signal to an external load, said transmitter comprising:

• a current sensing circuit configured to at least sense an amount of current induced back into said transmitter by the load after transmission of the signal;
• and
• a transmitter control circuit configured to utilize the sensed current to determine an amount and a polarity of current to be applied to the load to reduce the induced current to a desired value.

An electronic article surveillance (EAS) system comprising:

• a receiver configured to receive signals generated by EAS tags;
• and
• a transmitter configured to apply a signal to a load and further configured to transmit a signal at a resonant frequency of the EAS tag, said transmitter further configured to sense both an amount of current applied to the load during transmission periods and an amount of current induced by the load back into said transmitter during non-transmission periods, said transmitter configured to utilize the sensed currents to control an amount and a polarity of current applied to the load during both transmission periods and non-transmission periods.