System and method for controlling true output power of a transmitter
First Claim
1. A transmitter power control system, comprising:
- a voltage detector configured to generate a voltage signal that is proportional to an output voltage of a power amplifier of a transmitter, the voltage detector including;
a voltage scaler configured to scale the output voltage of the power amplifier using a voltage scaling ratio, wherein the voltage scaling ratio scales down the output voltage; and
a voltage scaling ratio controller configured to adjust the voltage scaling ratio to maintain the voltage signal within a predetermined voltage range;
a current detector configured to generate a current signal that is proportional to an output current of the power amplifier, the current detector including a current scaler configured to scale the output current using a predetermined current scaling ratio, wherein the predetermined current scaling ratio scales down the output current;
a power detector configured to generate a power signal that is i) based on the current signal and the voltage signal, and ii) proportional to an output power of the power amplifier; and
a power controller configured to generate a control signal to vary the output power based on a comparison of the power signal with at least one predetermined threshold.
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Abstract
A transmitter power control system includes a voltage detector that generates a voltage signal that is proportional to an output voltage of a power amplifier of a transmitter. A voltage scaler scales the output voltage of the power amplifier using a voltage scaling ratio. A voltage scaling ratio controller adjusts the voltage scaling ratio to maintain the voltage signal within a predetermined voltage range. A current detector generates a current signal that is proportional to an output current of the power amplifier and includes a current scaler that scales the output current using a predetermined current scaling ratio. A power detector generates a power signal that is based on the current signal and the voltage signal and is proportional to an output power of the power amplifier. A power controller generates a control signal to vary the output power based on a comparison of the power signal with at least one predetermined threshold.
22 Citations
18 Claims
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1. A transmitter power control system, comprising:
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a voltage detector configured to generate a voltage signal that is proportional to an output voltage of a power amplifier of a transmitter, the voltage detector including; a voltage scaler configured to scale the output voltage of the power amplifier using a voltage scaling ratio, wherein the voltage scaling ratio scales down the output voltage; and a voltage scaling ratio controller configured to adjust the voltage scaling ratio to maintain the voltage signal within a predetermined voltage range; a current detector configured to generate a current signal that is proportional to an output current of the power amplifier, the current detector including a current scaler configured to scale the output current using a predetermined current scaling ratio, wherein the predetermined current scaling ratio scales down the output current; a power detector configured to generate a power signal that is i) based on the current signal and the voltage signal, and ii) proportional to an output power of the power amplifier; and a power controller configured to generate a control signal to vary the output power based on a comparison of the power signal with at least one predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling output power of a transmitter, the method comprising:
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generating a voltage signal that is proportional to an output voltage of a power amplifier of a transmitter; scaling the output voltage of the power amplifier using a voltage scaling ratio, wherein the voltage scaling ratio scales down the output voltage; adjusting the voltage scaling ratio to maintain the voltage signal within a predetermined voltage range; generating a current signal that is proportional to an output current of the power amplifier; scaling the output current using a predetermined current scaling ratio, wherein the predetermined current scaling ratio scales down the output current; generating a power signal that is i) based on the current signal and the voltage signal, and ii) proportional to an output power of the power amplifier; controlling the power amplifier to regulate the output power based on the power signal; and generating a control signal to vary the output power based on a comparison of the power signal with at least one predetermined threshold. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification