Tunable radio frequency (RF) equalizer
AssigneeCorning Optical Communication Wireless Ltd
InventorRoi Yosy Ziv
Life of this patent
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Abstract
A radio frequency (RF) equalizer includes a coupler including an input port, an output port, a coupling port, and an isolation port; a combination circuit including; a coupling node electrically coupled to the coupling port; a first digitally controlled capacitor (DTC) connected between the coupling node and ground; a resistor connected between the coupling node and ground for controlling a quality factor (Q) of resonance of the equalizer; an isolation node coupled to the isolation port; and a second DTC connected between the isolation node and ground. A system and a method of operation are provided.
Claims19
An equalizing system, comprising:
- a wireless communication system for receiving at least one service, the wireless communication system comprising a plurality of optical fiber cables and a plurality of remote units connected by the optical fiber cables, the plurality of remote units being distributed over a deployment site, at least one service being routed to the plurality of remote units;
- and
- a RF equalizer comprising:
- a coupler comprising an input port, an output port, a coupling port, and an isolation port;
- and
- a combination circuit, comprising:
- a coupling node electrically coupled to the coupling port;
- a first digitally tunable capacitor (DTC) connected between the coupling node and ground;
- a resistor connected between the coupling node and ground that controls a quality factor of resonance;
- an isolation node coupled to the isolation port;
- and
- a second DTC, wherein
- one of the first DTC and the second DTC is configured as a coarse DTC and the other one of the first DTC and the second DTC is configured as a fine DTC.
An equalizing system, comprising:
- a wireless communication system for receiving at least one service from at least one source, the wireless communication system comprising:
- a head end unit;
- a plurality of optical fiber cables;
- and
- a plurality of remote units connected to the head end unit by the optical fiber cables, the plurality of remote units being distributed over a deployment site, the head end unit being configured for routing the at least one service to the plurality of remote units;
- and
- a RF equalizer comprising:
- a coupler comprising an input port, an output port, a coupling port, and an isolation port;
- and
- a combination circuit, comprising:
- a coupling node electrically coupled to the coupling port;
- a first DTC connected between the coupling node and ground;
- a resistor connected between the coupling node and ground that controls a quality factor of resonance;
- an isolation node;
- and
- a second DTC connected between the isolation node and ground.
An equalizing system, comprising:
- a wireless communication system for receiving at least one service from at least one source, the wireless communication system comprising:
- a head end unit;
- a plurality of optical fiber cables;
- and
- a plurality of remote units connected to the head end unit by the optical fiber cables, the head end unit being configured for routing the at least one service to the plurality of remote units;
- and
- a RF equalizer disposed in at least one of the head end unit and one of the plurality of remote units, the RF equalizer comprising:
- a coupler comprising an input port, an output port, a coupling port, and an isolation port;
- and
- a combination circuit, comprising:
- a coupling node electrically coupled to the coupling port;
- a first DTC connected to the coupling node and ground;
- a resistor connected between the coupling node and ground that controls a quality factor of resonance;
- an isolation node coupled to the isolation port;
- and
- a second DTC coupled to the isolation node and ground.
Dependencies are inferred from the claim text.