RF Power detector
First Claim
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1. A circuit for generating a control signal for controlling the output power of a power amplifier of a wireless device by comprising:
- a power detector coupled to the output of the power amplifier for generating a detector output signal; and
a variable gain amplifier coupled to the power detector for amplifying the detector output signal to a desired level, wherein the value of the control signal generated by the circuit is a function of the gain of the variable gain amplifier.
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Abstract
A method and apparatus is provided for detecting the output power of an RF power amplifier for purposes of controlling the output power. A circuit for generating an output power control signal includes a power detector to detect the output power of an RF power amplifier. A variable gain amplifier is coupled to the power detector for amplifying the output of the power detector. The value of the generated control signal is a function of the gain of the variable gain amplifier.
22 Citations
36 Claims
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1. A circuit for generating a control signal for controlling the output power of a power amplifier of a wireless device by comprising:
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a power detector coupled to the output of the power amplifier for generating a detector output signal; and
a variable gain amplifier coupled to the power detector for amplifying the detector output signal to a desired level, wherein the value of the control signal generated by the circuit is a function of the gain of the variable gain amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32)
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19. A power detector for an RF power amplifier comprising:
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a directional coupler for detecting RF power;
a variable gain amplifier having an input and an output, wherein the input is coupled to the directional coupler;
a sense circuit coupled to the output of the variable gain amplifier for rectifying the output of the variable gain amplifier;
an op amp for generating a gain control signal based on the rectified output of the sense circuit and a reference signal, wherein the gain control signal is provided to the variable gain amplifier to control the gain of the variable gain amplifier; and
conditioning circuitry for conditioning the gain control signal for use in controlling the output power of the RF power amplifier.
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27. A method of controlling the output power of an RF power amplifier comprising the steps of:
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detecting the output power of the RF power amplifier and generating a first signal from the detected output power;
amplifying the first signal using a variable gain amplifier;
generating a gain control signal from the output of the amplifier and from a reference signal;
using the gain control signal to set the gain of the amplifier;
generating a second signal by conditioning the gain control signal; and
using the second signal to control the output power of the RF power amplifier.
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33. An integrated circuit for use with an external directional coupler comprising:
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an RF power amplifier formed on the integrated circuit, wherein the integrated circuit is configured such that an external directional coupler can be used to generate a detector signal based on the output power of the RF power amplifier; and
a power detector formed on the same integrated circuit to generate an output signal based on the detector signal. - View Dependent Claims (34, 35, 36)
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Specification