Single ended class d amplifier

Details Single ended class d amplifier Single ended class d amplifier

H - Electricity

03

F

330/12

H03F 3/189 (2006.01)

Patent

CA 1044770

SINGLE ENDED CLASS D AMPLIFIER ABSTRACT OF THE DISCLOSURE A low level class D amplifier is disclosed, High efficiency is assured by operating the active devices in the switching or class D mode and recovering substantial portions of the power contained in the harmonics generated. The amp- lifier includes a switching circuit or class D active cir- cult, a harmonic impedance circuit and an RF circuit serially connected across a power supply for supplying DC power to the amplirler. During the conducting state of the class D active circuit, the harmonic impedance circuit limits the harmonic currents and stores energy as a magnetic field. Substantially all of the stored energy is recovered during the non-conduct- ing portion of the active circuit and returned to the DC power supply. Limiting harmonic currents reduces the dissi- pation of the active devices. Recovering the stored energy substantially improves the efficiency of the amplifier.

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