RF circuit with improved antenna matching
First Claim
1. An RF front-end circuit comprising:
- a tunable matching network comprising an input coupled to an RF interface port;
a directional coupler comprisinga first connection coupled to an RF input of a mixer,a second connection coupled to an RF signal generation port, anda third connection coupled to an output of the tunable matching network, wherein the directional coupler is configured to direct a signal from the RF signal generation port to the tunable matching network and direct a signal from the tunable matching network to the RF input of the mixer; and
a tunable matching network control circuit coupled to the tunable matching network, the control circuit configured to adjust an impedance match between the RF interface port and the output of the tunable matching network based on signal measurements made during operation of the RF front-end.
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Accused Products
Abstract
In one embodiment, RF front-end circuit includes a tunable matching network having an input coupled to an RF interface port, a directional coupler with a first connection coupled to an RF input of a mixer, a second connection coupled to an RF signal generation port, and a third connection coupled to an output of the tunable matching network. The directional coupler is configured to direct a signal from the RF signal generation port to the tunable matching network and to direct a signal from the tunable matching network port to the RF port of the mixer. The RF front-end circuit also has a tunable matching network control unit coupled to the tunable matching network. The control unit is configured to optimize an impedance match between the RF interface port and the output of the tunable matching network.
10 Citations
20 Claims
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1. An RF front-end circuit comprising:
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a tunable matching network comprising an input coupled to an RF interface port; a directional coupler comprising a first connection coupled to an RF input of a mixer, a second connection coupled to an RF signal generation port, and a third connection coupled to an output of the tunable matching network, wherein the directional coupler is configured to direct a signal from the RF signal generation port to the tunable matching network and direct a signal from the tunable matching network to the RF input of the mixer; and a tunable matching network control circuit coupled to the tunable matching network, the control circuit configured to adjust an impedance match between the RF interface port and the output of the tunable matching network based on signal measurements made during operation of the RF front-end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An integrated circuit comprising:
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a system input; a tunable matching network comprising an input coupled to the system input; a detection circuit coupled to an output of the tunable matching network; and a reactance control circuit coupled to a measurement output of the detection circuit and a control input of the tunable matching network, wherein the reactance control circuit is configured to reduce a reflection between the output of the tunable matching network and the system input based on measurements made by the detection circuit during operation of the integrated circuit; and a directional coupler coupled between a signal generator and the output of the matching network. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a RF system, the method comprising:
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measuring a reflection on a transmission line coupled to an input port during operation of the system; adjusting a matching network coupled to the input port during operation of the system, wherein the reflection is reduced based on the measuring; directionally coupling the input port to a mixer; generating a reference signal; coupling the reference signal to an LO port of the mixer; modulating the reference signal forming a modulated reference signal; and directionally coupling the modulated reference signal to the input port. - View Dependent Claims (18, 19, 20)
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Specification