Analog Devices,inc.

John Pierdomenico

Scott A Wurcer

Zoltan Frasch

Charly El-Khoury

Systems and methods for increasing amplifier supply power on demand for a plurality of xDSL signals is provided. In an embodiment, circuitry may be used to detect the signal or signals having the highest voltage. In different embodiments, the signal(s) with the highest absolute voltage or highest combined voltage between complementary signal pairs may be compared to a threshold voltage, such as an existing amplifier supply voltage. In different embodiments, when these highest voltage(s) exceed the threshold voltage, the corresponding amplifier supply voltages may be increased to meet the increased amplification demand. In some embodiments when these highest voltage(s) do not exceed the threshold voltage, the amplifier supply voltage may not be increased and the existing amplifier supply voltage may be used to amplify the xDSL signals.

Boosting xDSL amplifier supply power on-demand

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.

Amplifier system with digital adaptive power boost

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

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Temple, PA, United States of America

John Pierdomenico