PF 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.
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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, 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. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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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. - View Dependent Claims (28, 29, 30)
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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