Continuous alternating closed-open loop power control
First Claim
1. A method of continuously controlling a gain of an amplifier circuit comprising a variable gain amplifier while switching between an open-loop power control and a closed-loop power control, the method comprising:
- measuring an output power of the amplifier circuit during open-loop power control;
adjusting a closed-loop reference based on the measured output power to generate an adjusted closed-loop reference; and
after switching from open-loop power control to closed-loop power control, controlling the gain of the amplifier circuit based on the adjusted closed-loop reference.
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Accused Products
Abstract
The present invention comprises a method and apparatus for continuously, controlling a gain of an amplifier circuit while switching between open-loop and closed-loop power control. A control circuit controls the gain of the amplifier circuit during open-loop and closed-loop power control modes based on selected references. Before the switch from open-loop to closed-loop power control, the control circuit determines a closed-loop reference based on a power measured at the amplifier circuit output before the switch. After the switch, the control circuit controls the gain of the amplifier circuit based on the determined closed-loop reference. Before switching from closed-loop to open-loop power control, the control circuit generates a difference between a current open-loop reference and a previous open-loop reference. After the switch, the control circuit controls the gain of the amplifier circuit based on an open-loop gain control signal generated by applying the difference to a previous closed-loop gain control signal.
57 Citations
33 Claims
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1. A method of continuously controlling a gain of an amplifier circuit comprising a variable gain amplifier while switching between an open-loop power control and a closed-loop power control, the method comprising:
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measuring an output power of the amplifier circuit during open-loop power control; adjusting a closed-loop reference based on the measured output power to generate an adjusted closed-loop reference; and after switching from open-loop power control to closed-loop power control, controlling the gain of the amplifier circuit based on the adjusted closed-loop reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An amplification system comprising:
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an amplifier circuit including a variable gain amplifier; a detection circuit configured to measure an output power of the amplifier circuit; and a power control circuit operable in both an open-loop and a closed-loop power control mode to control the gain of the variable gain amplifier based on a closed-loop or open-loop reference, said power control circuit configured to determine the closed-loop reference when switching from open-loop power control to closed-loop power control based on the output power measured by the detection circuit before the switch. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of continuously controlling a gain of an amplifier circuit comprising:
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determining an open-loop gain adjustment value based on a difference between a current open-loop reference and a previous open-loop reference; and adjusting a gain control signal based on the open-loop gain adjustment value. - View Dependent Claims (21, 22, 23, 24, 25)
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26. An amplification system comprising:
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an amplifier circuit including at least one variable gain amplifier; a power control circuit configured to determine an open-loop gain adjustment value based on a difference between a current open-loop reference and a previous open-loop reference, and further configured to adjust a gain control signal based on the open-loop gain adjustment value. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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Specification