System and method for a directional coupler
First Claim
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1. A method of operating a directional coupler, the method comprising:
- determining a coupled power variation byapplying an input signal at an input port of the directional coupler,applying a first impedance at a transmitted port of the directional coupler,measuring a first coupled power at a coupled port of the directional coupler after applying the first impedance,applying a second impedance at the transmitted port of the directional coupler, wherein the second impedance is different from the first impedance,measuring a second coupled power at the coupled port of the directional coupler after applying the second impedance,determining a difference between the first coupled power and the second coupled power to form the coupled power variation, wherein the directional coupler is configured to provide to the coupled port of the directional coupler a first signal proportional to a first radio frequency (RF) signal propagating from the input port of the directional coupler to the transmitted port of the directional coupler, and is configured to provide to an isolated port of the directional coupler a second signal proportional to a second RF signal propagating from the transmitted port of the directional coupler to the input port of the directional coupler; and
adjusting a termination impedance coupled to the isolated port of the directional coupler when the coupled power variation exceeds a predetermined threshold.
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Abstract
In accordance with an embodiment, a method of operating a directional coupler includes determining a coupled power variation by applying an input signal at an input port of the directional coupler, applying a first impedance at a transmitted port of the directional coupler, measuring a first coupled power at a coupled port of the directional coupler after applying the first impedance, applying a second impedance at the transmitted port of the directional coupler, measuring a second coupled power after applying the second impedance, and determining a difference between the first coupled power and the second coupled power to form the coupled power variation.
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Citations
28 Claims
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1. A method of operating a directional coupler, the method comprising:
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determining a coupled power variation by applying an input signal at an input port of the directional coupler, applying a first impedance at a transmitted port of the directional coupler, measuring a first coupled power at a coupled port of the directional coupler after applying the first impedance, applying a second impedance at the transmitted port of the directional coupler, wherein the second impedance is different from the first impedance, measuring a second coupled power at the coupled port of the directional coupler after applying the second impedance, determining a difference between the first coupled power and the second coupled power to form the coupled power variation, wherein the directional coupler is configured to provide to the coupled port of the directional coupler a first signal proportional to a first radio frequency (RF) signal propagating from the input port of the directional coupler to the transmitted port of the directional coupler, and is configured to provide to an isolated port of the directional coupler a second signal proportional to a second RF signal propagating from the transmitted port of the directional coupler to the input port of the directional coupler; and adjusting a termination impedance coupled to the isolated port of the directional coupler when the coupled power variation exceeds a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A directional coupler system comprising:
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a directional coupler, wherein the directional coupler is configured to provide to a coupled port of the directional coupler a first signal proportional to a first radio frequency (RF) signal propagating from an input port of the directional coupler to a transmitted port of the directional coupler, and is configured to provide to an isolated port of the directional coupler a second signal proportional to a second RF signal propagating from the transmitted port of the directional coupler to the input port of the directional coupler; a power detector coupled to the coupled port of the directional coupler; a switchable impedance circuit operatively coupled to the transmitted port of the directional coupler, the switchable impedance circuit configured to switchably apply a first impedance to the transmitted port and a second impedance to the transmitted port according to a control input; and an output selection switch configured to route one of a direct output of the coupled port of the directional coupler and an output of the power detector to an output pin. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A circuit comprising:
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a first directional coupler comprising a first input port, a first transmitted port, a first isolated port and a first coupled port; and a second directional coupler comprising a second input port coupled to the first transmitted port of the first directional coupler, a second transmitted port, a second isolated port and a second coupled port; a switchable impedance circuit coupled to the second transmitted port of the second directional coupler, the switchable impedance circuit configured to switchably apply a first impedance to the second transmitted port and a second impedance to the second transmitted port; a switching network configured to route one of the first isolated port, the first coupled port, the second isolated port and the second coupled port to an output of the switching network; a power detector coupled to the output of the switching network; and a bypass switch configured to route one of the output of the switching network and the output of the power detector to an output pin. - View Dependent Claims (22, 23, 24, 25)
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26. A directional coupler system comprising:
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a directional coupler, wherein the directional coupler is configured to provide to a coupled port of the directional coupler a first signal proportional to a first radio frequency (RF) signal propagating from an input port of the directional coupler to a transmitted port of the directional coupler, and is configured to provide to an isolated port of the directional coupler a second signal proportional to a second RF signal propagating from the transmitted port of the directional coupler to the input port of the directional coupler; a power detector coupled to the coupled port of the directional coupler; a switchable impedance circuit operatively coupled to the transmitted port of the directional coupler, the switchable impedance circuit configured to switchably apply a first impedance to the transmitted port and a second impedance to the transmitted port according to a control input; and a controller coupled to the directional coupler, the switchable impedance circuit and the power detector, the controller configured to determine a coupled power variation by applying an input signal at an input port of the directional coupler, applying a first impedance at the transmitted port of the directional coupler via the switchable impedance circuit, measuring a first coupled power at a coupled port of the directional coupler after applying the first impedance via the power detector, applying a second impedance at the transmitted port of the directional coupler, wherein the second impedance is different from the first impedance via the switchable impedance circuit, measuring a second coupled power at the coupled port of the directional coupler while after applying the second impedance via the power detector, and determining a difference between the first coupled power and the second coupled power to form the coupled power variation, and adjust a first termination impedance coupled to the isolated port of the directional coupler when the coupled power variation exceeds a predetermined threshold. - View Dependent Claims (27, 28)
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Specification