US Patent:
20100237944, Sep 23, 2010
Inventors:
John Pierdomenico - Temple PA, US
Zoltan Frasch - Hooksett NH, US
Charly El-Khoury - Woburn MA, US
Assignee:
ANALOG DEVICES, INC. - Norwood MA
International Classification:
H03F 3/45
Abstract:
An amplifier system with digital adaptive power boost includes a charge pump for providing a power supply to an amplifier. The charge pump may switch between a fixed input DC voltage and a boosted value for a certain period of time in response to an increase in an input signal to the amplifier. The charge pump may use a switching transistor which is switched on only when the input signal to the amplifier exceeds a threshold. The amplifier system may be used for envelope tracking, especially for envelope tracking of low duty cycle signals, e.g., xDSL or vDSL.
