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US 8,478,213 B2Granted
Methods and apparatus for power control
AssigneeResearch In Motion Limited
InventorKhurram Muhammad
Life of this patent
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Abstract
Various embodiments include a method for controlling power in a transmitter, the method comprising measuring an indication of an output power of the transmitter, comparing a first value corresponding to the indication of the output power to a second value corresponding to a desired output power; and adjusting a bias of at least one component in the transmitter in order to bring the output power closer to the desired output power. Embodiments also include various methods, systems and apparatus.
Claims16
A method for controlling power in a transmitter, the method comprising:
- measuring an indication of an output power of the transmitter;
- comparing a first value corresponding to the indication of the output power to a second value corresponding to a desired output power in order to create and error signal;
- based on the error signal, setting a power supply voltage to be applied to a power amplifier of the transmitter, the power amplifier including an output coupled to an antenna of the transmitter, wherein the power supply voltage is set as a voltage level to produce the desired output power from the transmitter, and
- based on the error signal, and after setting the power supply voltage of the power amplifier, adjusting a bias of at least one of a digital-to-analog converter, a mixer, and a pre-power amplifier, wherein the digital-to-analog converter, the mixer, and the pre-power amplifier are coupled to the power amplifier, and wherein adjusting the bias of at least one of the digital-to-analog converter, the mixer, and a pre-power amplifier includes adjusting the bias in order to achieve the desired output power for the transmitter.
1 more element
A method for power control of a transmitter, the transmitter including a plurality of components, the method comprising:
- repeatedly performing the following acts until an output power for the transmitter is substantially equal to a desired output power:
- measuring an indication of output power of the transmitter;
- comparing a first value corresponding to the indication of output power to a second value corresponding to the desired output power to determine an error value;
- based on the error value, setting a power supply voltage to be applied to a power amplifier of the transmitter, the power amplifier including an output coupled to an antenna of the transmitter, wherein the power supply voltage is set as a voltage level to produce the desired output power from the transmitter, and
- based on the error value, and after setting the power supply voltage of the power amplifier, adjusting a bias of at least one of a digital-to-analog converter, a mixer, and a pre-power amplifier, wherein the digital-to-analog converter, the mixer, and the pre-power amplifier are coupled to the power amplifier, and wherein adjusting the bias of at least one of the digital-to-analog converter, the mixer, and a pre-power amplifier includes adjusting the bias in order to achieve the desired output power for the transmitter.
2 more elements
A method for controlling transmitter power in a portable electronic device, the method comprising:
- receiving a command from a base station indicating a first output power for transmission;
- ramping an output power from a current output power to the first output power through a plurality of steps, wherein a step includes:
- reading a value from a ramp look-up-table, the value indicating an output power level for the step;
- and
- repeatedly adjusting setting of components of the transmitter based on feedback indicating a current output power level of the transmitter until the current output power level of the transmitter is substantially equal to the output power level for the step,
- wherein adjusting at least one component for the step includes:
- based on the feedback indicating the current power level, setting a power supply voltage to be applied to a power amplifier of the transmitter, the power amplifier including an output coupled to an antenna of the transmitter, wherein the power supply voltage is set as a voltage level to produce the desired output power for the step, and
- based on the feedback indicating the current power level, and after setting the power supply voltage of the power amplifier, adjusting a bias of at least one of a digital-to-analog converter, a mixer, and a pre-power amplifier, wherein the digital-to-analog converter, the mixer, and the pre-power amplifier are coupled to the power amplifier, and wherein adjusting the bias of at least one of the digital-to-analog converter, the mixer, and a pre-power amplifier includes adjusting the bias in order to achieve the desired output power for the step.
5 more elements
A portable electronic device having a transmitter comprising:
- a power amplifier;
- a digital to analog converter, a mixer, and a pre-power amplifier coupled to the power amplifier;
- a coupler configured to obtain an indication of power for a signal at an output of the power amplifier;
- a controller configured to output an error signal as a function of a comparison between a value corresponding to the indication of power to a value corresponding to a desired output power;
- and
- an adjustment mechanism configured to, based on an error signal, determine a setting for a power supply voltage to be applied to the power amplifier of the transmitter, wherein the power supply voltage is set as a voltage level to produce the desired output power from the transmitter, and
- the adjustment mechanism further configured to determine a bias setting for the power amplifier as a function of the error signal, the adjustment mechanism configured to apply a bias to the power amplifier, and wherein the adjustment mechanism is configured to determine and apply a gain setting for at least one of the digital to analog converter, mixer, and re-power amplifier as a function of the error signal.
4 more elements
Dependencies are inferred from the claim text.