INPUT DRIVE CONTROL FOR SWITCHER REGULATED POWER AMPLIFIER MODULES
First Claim
1. A control system for a transmitter of a wireless device, the transmitter having a pre-amplifier and a power amplifier coupled to an output of the pre-amplifier, the control system comprising:
- a switching regulator control block configured to generate a switching supply control signal based on a pre-amplified transmission signal detected at the output of the pre-amplifier, the switching supply control signal comprising control values for controlling a switched mode power supply to generate a supply voltage signal for the power amplifier; and
a compensating control block configured to generate a gain correction signal based on the supply voltage signal and a rate of change of the supply voltage signal, the gain correction signal being used to adjust a gain control signal provided to the pre-amplifier for controlling gain in the pre-amplifier,wherein the compensating control block has a compensating transfer function adapted to produce the gain correction signal to maintain a substantially linear relationship between the gain control signal and power of an amplified transmission signal produced by the power amplifier.
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Accused Products
Abstract
Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
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Citations
19 Claims
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1. A control system for a transmitter of a wireless device, the transmitter having a pre-amplifier and a power amplifier coupled to an output of the pre-amplifier, the control system comprising:
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a switching regulator control block configured to generate a switching supply control signal based on a pre-amplified transmission signal detected at the output of the pre-amplifier, the switching supply control signal comprising control values for controlling a switched mode power supply to generate a supply voltage signal for the power amplifier; and a compensating control block configured to generate a gain correction signal based on the supply voltage signal and a rate of change of the supply voltage signal, the gain correction signal being used to adjust a gain control signal provided to the pre-amplifier for controlling gain in the pre-amplifier, wherein the compensating control block has a compensating transfer function adapted to produce the gain correction signal to maintain a substantially linear relationship between the gain control signal and power of an amplified transmission signal produced by the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling a transmitter of a wireless device using a control system, the transmitter having a pre-amplifier and a power amplifier coupled to an output of the pre-amplifier, the method comprising:
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generating a switching supply control signal based on a pre-amplified transmission signal detected at the output of the pre-amplifier, the switching supply control signal comprising control values for controlling a switched mode power supply; providing the switching supply control signal to the switched mode power supply to generate a supply voltage signal for the power amplifier; generating a gain correction signal based on the supply voltage signal and a rate of change of the supply voltage signal; adjusting a gain control signal using the gain correction signal, the gain control signal for controlling gain in the pre-amplifier; and providing the gain control signal to the pre-amplifier, wherein the gain correction signal is generated using a compensating transfer function to maintain a substantially linear relationship between the gain control signal and power of an amplified transmission signal produced by the power amplifier. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification