RF TRANSMITTER WITH AVERAGE POWER TRACKING AND METHODS FOR USE THEREWITH
First Claim
Patent Images
1. A radio frequency (RF) transmitter comprising:
- an power amplifier operable to generate a transmit signal modulated with outbound data for transmission to a remote communication device via an antenna section;
a power management unit, coupled to the power amplifier, that generates a supply voltage to power the power amplifier, wherein the supply voltage is set by the power management unit based on an average power tracking signal; and
a processing module, coupled to the power management unit, that adjusts the average power tracking signal based on a desired power level and further based on a desired linearity.
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Abstract
A RF transmitter includes a power amplifier that generates a transmit signal modulated with outbound data for transmission to a remote communication device via an antenna section. A supply voltage to power the power amplifier is adjusted based on an average power tracking signal. A reflected power from the antenna section is measured. The average power tracking signal is adjusted based on the reflected power to compensate for the changes in impedance of the antenna section and to maintain a desired linearity.
54 Citations
20 Claims
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1. A radio frequency (RF) transmitter comprising:
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an power amplifier operable to generate a transmit signal modulated with outbound data for transmission to a remote communication device via an antenna section; a power management unit, coupled to the power amplifier, that generates a supply voltage to power the power amplifier, wherein the supply voltage is set by the power management unit based on an average power tracking signal; and a processing module, coupled to the power management unit, that adjusts the average power tracking signal based on a desired power level and further based on a desired linearity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio frequency (RF) transmitter comprising:
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an power amplifier operable to generate a transmit signal modulated with outbound data for transmission to a remote communication device via an antenna section; a power management unit, coupled to the power amplifier, that generates a supply voltage to power the power amplifier, wherein the supply voltage is set by the power management unit based on an average power tracking signal; and a directional coupler, coupled in a transmit path between the power amplifier and the antenna section, configurable to generate a reflected power signal that indicates a reflected power from the antenna section in response to the transmit signal; a first envelope detector, coupled to the directional coupler, configurable to generate a reflected power voltage that indicates the reflected power; a processing module, coupled to the power management unit, that adjusts the average power tracking signal based on the reflected power indicated by the reflected power voltage and further based on a desired linearity. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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generating, via a power amplifier, a transmit signal modulated with outbound data for transmission to a remote communication device via an antenna section; generating a supply voltage to power the power amplifier, wherein the supply voltage is adjusted based on an average power tracking signal; measuring a reflected power from the antenna section in response to the transmit signal; and adjusting the average power tracking signal based on the reflected power to compensate for changes in impedance of the antenna section and to maintain a desired linearity.
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Specification