TUNABLE RADIO FREQUENCY (RF) EQUALIZER
First Claim
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1. A radio frequency (RF) equalizer, comprising:
- a coupler comprising an input port, an output port, a coupling port, and an isolation port;
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 for controlling a quality factor (Q) of resonance;
an isolation node coupled to the isolation port; and
a second DTC connected between the isolation node and ground.
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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.
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Citations
22 Claims
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1. A radio frequency (RF) equalizer, comprising:
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a coupler comprising an input port, an output port, a coupling port, and an isolation port; 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 for controlling a quality factor (Q) of resonance; an isolation node coupled to the isolation port; and a second DTC connected between the isolation node and ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for equalizing a circuit, comprising:
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(a) coupling a first digitally tunable capacitor (DTC) between a coupling port of a coupler and ground; (b) coupling a second DTC between an isolation port of the coupler and ground; (c) determining a frequency response of the circuit in a desired band of operation; (d) setting the first DTC to a predetermined resonance frequency outside the desired band of operation to generate a frequency response for equalizing the frequency response of the circuit in the desired band of operation; and (e) adjusting the second DTC to fine tune the equalizing the frequency response. - View Dependent Claims (10, 11, 12, 13)
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14. An equalizing system, comprising:
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a distributed antenna system (DAS) for receiving at least one service from at least one base station, the DAS comprising a head end unit and a plurality of remote antenna units, the plurality of remote antenna 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 antenna units; and a RF equalizer disposed in at least one of the head end unit and one of the plurality of remote antenna units, the RF equalizer comprising; a coupler comprising an input port, an output port, a coupling port, and an isolation port; 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 (Q) of resonance; an isolation node coupled to the isolation port; and a second DTC connected between the isolation node and ground. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification