| 主权项 |
1. Driver circuit for a power amplifier of class D type comprising:
at least a first output terminal; a high power supply rail receiving a high power supply voltage and a low power supply rail receiving a low supply voltage; at least first and second current branches arranged in parallel between the high power supply rail and the low power supply rail, each comprising at least a first switch and being adapted for driving power to the output terminal, and said second current branch being powered in a first configuration of the driver circuit and being powered down in a second configuration of the driver circuit; wherein: the first switch of the first branch comprises a switching Metal Oxyde Semiconductor, MOS, transistor of a first conduction type, N or P, controlled by a first switching signal, in series with a cascode MOS transistor of said first conduction type, controlled by first static bias control signal; the first switch of the second branch comprises a switching MOS transistor of the first conduction type, controlled by a second switching signal, in series with a cascode MOS transistor of said first conduction type, controlled by a first dynamic bias control signal; and, the driver circuit further comprising a first bias circuitry adapted for dynamically generating the first dynamic bias control signal from the first static bias control signal and from at least one additional control signal enabling operation of the driver circuit in the second configuration, said first bias circuitry being further adapted to cause the cascode MOS transistor of the first switch of the second branch to be ‘Off’ in said second configuration of the driver circuit. |
