Evaluation of a charge impedance at the output of a directional coupler
First Claim
1. A circuit for evaluating a charge impedance at the output of a directional coupler having a first line adapted to convey a desired signal between a first terminal and a second terminal adapted to be connected to an antenna, and having a second line coupled to the first line, the second line comprising a third terminal on the side of the first terminal and a fourth terminal on the side of the second terminal, the circuit comprising:
- a first input terminal adapted to be connected to said third terminal of the coupler;
a second input terminal adapted to be connected to the fourth terminal of the coupler;
a homodyne detector having a first input for a signal to be processed connected to said second input terminal and having a second local oscillator input connected to said first input terminal, wherein the homodyne detector derives its local oscillator input from the third terminal of the directional coupler;
a first low-pass filter having an input connected to a first output of the homodyne detector and providing first data relative to the charge impedance; and
a second low-pass filter having an input connected to a second output of the homodyne detector and providing second data relative to the charge impedance.
1 Assignment
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Accused Products
Abstract
A method and circuit for evaluating a charge impedance at the output of a directional coupling having a first line adapted to convey a desired signal between a first terminal and a second terminal adapted to be connected to an antenna, and having a second line coupled to the first one including a third terminal on the side of the first terminal and a fourth terminal on the side of the second terminal, wherein the signal present on the fourth terminal is submitted to a homodyne detector having its local oscillator signal sampled from the third terminal.
6 Citations
23 Claims
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1. A circuit for evaluating a charge impedance at the output of a directional coupler having a first line adapted to convey a desired signal between a first terminal and a second terminal adapted to be connected to an antenna, and having a second line coupled to the first line, the second line comprising a third terminal on the side of the first terminal and a fourth terminal on the side of the second terminal, the circuit comprising:
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a first input terminal adapted to be connected to said third terminal of the coupler; a second input terminal adapted to be connected to the fourth terminal of the coupler; a homodyne detector having a first input for a signal to be processed connected to said second input terminal and having a second local oscillator input connected to said first input terminal, wherein the homodyne detector derives its local oscillator input from the third terminal of the directional coupler; a first low-pass filter having an input connected to a first output of the homodyne detector and providing first data relative to the charge impedance; and a second low-pass filter having an input connected to a second output of the homodyne detector and providing second data relative to the charge impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for evaluating a charge impedance at the output of a directional coupler having a first line adapted to convey a desired signal between a first terminal and a second terminal adapted to be connected to an antenna, and having a second line coupled to the first line, the second line comprising a third terminal on the side of the first terminal and a fourth terminal on the side of the second terminal, comprising:
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supplying a signal present on the fourth terminal of the directional coupler to a first input of a homodyne detector; supplying a signal present on the third terminal of the directional coupler to a local oscillator input of the homodyne detector; and processing outputs of the homodyne detector to evaluate the charge impedance at the output of the directional coupler. - View Dependent Claims (9)
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10. A radio frequency circuit comprising:
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a directional coupler having a main line configured to carry a signal between a first port and a second port, and a secondary line coupled to the main line, the secondary line having a third port associated with the first port and a fourth port associated with the second port; and a detection circuit comprising; a homodyne detector having a first input coupled to the fourth port of the directional coupler and a second input coupled to the third port of the directional coupler; a first low-pass filter having an input coupled to a first output of the homodyne detector and providing first data; and a second low-pas filter having an input coupled to a second output of the homodyne detector and providing second data. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for evaluating a directional coupler having a main line configured to carry a signal between a first port and a second port, and a secondary line coupled to the main line, the secondary line having a third port associated with the first port and a fourth port associated with the second port, comprising:
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coupling a first input of a homodyne detector to the fourth port of the directional coupler; coupling a second input of the homodyne detector to the third port of the directional coupler; low-pass filtering a first output of the homodyne detector and providing first data; low-pass filtering a second output of the homodyne detector and providing second data; and processing the first and second data to evaluate a charge impedance at the output of the directional coupler. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification