Input drive control for 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 an output of 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 to sense the pre-amplified transmission signal and provide a detected pre-amp output signal; and
a power management block comprising;
a power supply block configured to generate a supply voltage signal based on the detected pre-amp output signal, and to provide the supply voltage signal to the power amplifier; and
a compensating control block coupled to an output of the power supply block in a compensating feedback loop and configured to generate a gain correction signal based on the supply voltage signal, the gain correction signal for adjusting an automatic gain control (AGC) signal to produce a modified AGC signal for controlling pre-amplifier gain.
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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.
78 Citations
21 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 an output of 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 to sense the pre-amplified transmission signal and provide a detected pre-amp output signal; and a power management block comprising; a power supply block configured to generate a supply voltage signal based on the detected pre-amp output signal, and to provide the supply voltage signal to the power amplifier; and a compensating control block coupled to an output of the power supply block in a compensating feedback loop and configured to generate a gain correction signal based on the supply voltage signal, the gain correction signal for adjusting an automatic gain control (AGC) signal to produce a modified AGC signal for controlling pre-amplifier gain. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 an output of 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 to sense the pre-amplified transmission signal and provide a detected pre-amp output signal; and a power management block comprising a power supply block configured to generate a supply voltage signal based on the detected pre-amp output signal, and to provide the supply voltage signal to the power amplifier; and a compensating control block coupled to an output of the power supply block in a compensating feedback loop and configured to generate a gain correction signal based on the supply voltage signal, the gain correction signal for adjusting an automatic gain control (AGC) signal to produce a modified AGC signal for controlling pre-amplifier gain. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of controlling gain of a power amplification block of a transmitter, the power amplification block including a pre-amplifier and a power amplifier coupled to an output of the pre-amplifier, wherein the method comprises:
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sensing the output of the pre-amplifier to provide a detected pre-amp output signal; generating a supply voltage signal based on the detected pre-amp output signal and providing the supply voltage signal to the power amplifier; generating a gain correction signal based on the supply voltage signal; and adjusting an automatic gain control (AGC) signal based on the gain correction signal to produce a modified AGC signal for controlling pre-amplifier gain. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification