Amplifier circuit

摘要

An amplifier circuit comprising a driver (204, 304) configured to provide a switched mode input signal, a switching mode power amplifier (206, 306) configured to receive the switched mode input signal and provide an output signal for an external load (210, 310); and a sensor (208, 308) configured to sense the impedance of the external load (210, 310) The driver is configured to set the duty cycle of the switched mode input signal in accordance with the sensed impedance of the external load (210, 310).

主权项

1. An amplifier circuit comprising:
a driver configured to provide a switched mode input signal; a switching mode power amplifier configured to receive the switched mode input signal and provide an output signal for an external load; and a sensor configured to sense the impedance of the external load; wherein the driver is configured to set the duty cycle of the switched mode input signal in accordance with the sensed impedance of the external load; and wherein the driver is configured to set the duty cycle such that a switching voltage of the switching mode power amplifier is below a threshold level.