Control of switcher regulated power amplifier modules
First Claim
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1. A transmitter for a wireless communications device, wherein the transmitter comprises:
- a power amplification block comprising;
a pre-amplifier configured to amplify a transmission signal to produce a pre-amplified transmission signal; and
a power amplifier coupled to the pre-amplifier and configured to amplify the pre-amplified transmission signal to produce an amplified transmission signal;
a detector coupled to the output of the pre-amplifier and configured to provide a detected pre-amp output signal; and
a power management block comprising;
a switching regulator control block configured to generate a switching supply control signal by applying a switching control transfer function to the detected pre-amp output signal; and
a switched mode power supply coupled to the switching regulator control block and configured to generate a supply voltage signal based on the switching supply control signal and provide the supply voltage signal to the power amplifier;
wherein the switching control transfer function is derived based on a characterization of the response of the detector, control curves of the switched mode power supply, and a response of the power amplifier to input drive.
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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
15 Claims
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1. A transmitter for a wireless communications device, wherein the transmitter comprises:
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a power amplification block comprising; a pre-amplifier configured to amplify a transmission signal to produce a pre-amplified transmission signal; and a power amplifier coupled to the pre-amplifier and configured to amplify the pre-amplified transmission signal to produce an amplified transmission signal; a detector coupled to the output of the pre-amplifier and configured to provide a detected pre-amp output signal; and a power management block comprising; a switching regulator control block configured to generate a switching supply control signal by applying a switching control transfer function to the detected pre-amp output signal; and a switched mode power supply coupled to the switching regulator control block and configured to generate a supply voltage signal based on the switching supply control signal and provide the supply voltage signal to the power amplifier; wherein the switching control transfer function is derived based on a characterization of the response of the detector, control curves of the switched mode power supply, and a response of the power amplifier to input drive. - View Dependent Claims (2, 3, 4, 5)
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6. A mobile communication device comprising:
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a main processor configured to control the operation of the mobile communication device; a communication subsystem connected to the main processor, the communication subsystem being configured to send and receive data, the communication subsystem comprising a power amplification block comprising a pre-amplifier configured to amplify a transmission signal to produce a pre-amplified transmission signal; and
a power amplifier coupled to the pre-amplifier and configured to amplify the pre-amplified transmission signal to produce an amplified transmission signal;a detector coupled to the output of the pre-amplifier and configured to provide a detected pre-amp output signal; and a power management block comprising a switching regulator control block configured to generate a switching supply control signal by applying a switching control transfer function to the detected pre-amp output signal; and a switched mode power supply coupled to the switching regulator control block and configured to generate a supply voltage signal based on the switching supply control signal and provide the supply voltage signal to the power amplifier; wherein the switching control transfer function is derived based on a characterization of the response of the detector, control curves of the switched mode power supply, and a response of the power amplifier to input drive. - View Dependent Claims (7, 8, 9, 10)
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11. A method of providing a supply voltage signal to a power amplification block of a transmitter, the power amplification block comprising a pre-amplifier and a power amplifier, wherein the method comprises:
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detecting the output of the pre-amplifier using a detector to provide a detected pre-amp output signal; generating a switching supply control signal by applying a switching control transfer function to the detected pre-amp output signal; and generating the supply voltage signal by providing the switching supply control signal to a switched mode power supply; wherein the switching control transfer function is derived based on a characterization of the response of the detector, control curves of the switched mode power supply, and a response of the power amplifier to input drive. - View Dependent Claims (12, 13, 14, 15)
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Specification