Pseudo-envelope follower power management system with high frequency ripple current compensation
First Claim
1. A pseudo-envelope follower power management system with high frequency ripple compensation comprising:
- a switch mode power supply converter configured to;
generate a switching output voltage; and
generate a switching voltage output estimate which provides an early indication of a future voltage level of the switching output voltage;
an open loop high frequency ripple compensation assist circuit configured to;
receive the switching voltage output estimate and a VRAMP signal;
generate a high frequency ripple compensation current based on the switching voltage output estimate and the VRAMP signal; and
apply the high frequency ripple compensation current to a power amplifier supply output to reduce a high frequency ripple current at the power amplifier supply output.
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Accused Products
Abstract
Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system including a parallel amplifier and a switch mode power supply converter cooperatively coupled to generate a power supply voltage at a power supply output coupled to a linear RF power amplifier. The parallel amplifier output is in communication with the power amplifier supply output. The parallel amplifier governs operation of the switch mode power supply converter and regulates the power amplifier supply voltage base on a VRAMP signal. The parallel amplifier circuit includes an open loop high frequency compensation assist circuit that generates a high frequency ripple compensation current based on an estimate of the high frequency ripple currents contained in a ripple current of the power inductor. The high frequency ripple compensation current is injected into the parallel amplifier circuit output to cancel out high frequency ripple currents at the power amplifier supply output.
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Citations
33 Claims
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1. A pseudo-envelope follower power management system with high frequency ripple compensation comprising:
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a switch mode power supply converter configured to; generate a switching output voltage; and generate a switching voltage output estimate which provides an early indication of a future voltage level of the switching output voltage; an open loop high frequency ripple compensation assist circuit configured to;
receive the switching voltage output estimate and a VRAMP signal;generate a high frequency ripple compensation current based on the switching voltage output estimate and the VRAMP signal; and apply the high frequency ripple compensation current to a power amplifier supply output to reduce a high frequency ripple current at the power amplifier supply output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for reducing high frequency ripple currents at a power amplifier supply output comprising:
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generating a switching output voltage and a switching voltage output estimate with a switch mode power supply converter, wherein the switching voltage output estimate provides an early indication of a future voltage level of the switching output voltage; receiving the switching voltage output estimate and a VRAMP signal at an open loop high frequency ripple compensation assist circuit; generating a high frequency ripple compensation current based on the switching voltage output estimate and the VRAMP signal; and applying the high frequency ripple compensation current to the power amplifier supply output to reduce a high frequency ripple current at the power amplifier supply output. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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Specification