Patent ID: 6636103
Filing Date: 2003-10-21
Classification: H03F

Abstract:
An amplifier system with on-demand power supply boost comprising:an amplifier circuit for receiving an input signal; and a charge pump connected to positive and negative power supplies having predetermined supply voltages and being responsive to peaks in said input signal for increasing beyond said predetermined supply voltages, the supply voltage applied to said amplifier in response to an increase in the input signal, wherein said charge pump includes a tracking charge pump, said tracking charge pump includes: a charge storage device; an isolation device interconnecting said charge storage device and one pole of a power supply; a driver circuit responsive to the input signal and connected between both poles of the power supply; said power supply having predetermined power supply voltages; and a bias circuit for biasing said driver circuit to charge said charge storage device in the charge mode and in a boost mode for increasing beyond said predetermined power supply voltages the supply voltage applied by said storage device to an external load response to an increase in the input signal.