Patent ID: 8929806
Filing Date: 2015-01-06
Classification: H02J,H04M

Abstract:
1. A wireless device comprising: a radio-frequency (RF) interface configured to receive an RF signal and configured to provide an output data signal derived from the RF signal; logic circuitry configured to receive the output data signal and provide an output analog signal based on the output data signal; power circuitry coupled to the RF interface and configured to provide DC operating power derived from the RF signal to the RF interface and the logic circuitry; a first impedance matching transformer comprising a plurality of switches configurable to adjust a turns ratio of the first transformer and having an input coupled to the logic circuitry and having an output, wherein the first transformer is configured to receive the output analog signal from the logic circuitry and convert the output analog signal to a converted output analog signal having a lower voltage and a higher current than the output analog signal; and a first transducer coupled to the output of the first impedance matching transformer and configured to receive the converted output analog signal from the first transformer output and produce an output audio signal based on the output analog signal.