US 8,797,119 B2Granted

Tuning methods for tunable matching networks

AssigneeWispry, Inc.

InventorsQizheng Gu, Javier Rodriguez De Luis

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Abstract

Methods for tuning a tunable matching network can involve comparing a source impedance of a source to a real part of a load impedance of a load. Depending on characteristics of the network, capacitances of one or more tunable capacitors can be set to correspond to device boundary parameters, and capacitances of remaining tunable capacitors can be set based on a predetermined relationship between the parameters of the capacitors, the source, the load, and other components. From these initially determined values, the capacitance value of one or more of the capacitors can be adjusted to fall within device boundary conditions and achieve a perfect or at least best match tuning configuration.

Claims10

Dependent claims

A method for tuning a tunable matching network comprising a first variable capacitor comprising a terminal connected to a first node, a second variable capacitor comprising a terminal connected to a second node, and a first inductor and a third variable capacitor connected in parallel between the first and second nodes, the method comprising:

(a) comparing a source impedance of a source connected to the first node to a real part of a load impedance of a load connected to the second node;
(b) when the source impedance is greater than the real part of the load impedance or when a calculated capacitance of the second variable capacitor is less than a minimum capacitance:
(i) setting a capacitance value of the second variable capacitor to be a minimum capacitance of the second variable capacitor;
and
(ii) determining a capacitance value of the first variable capacitor based on a predetermined relationship between the capacitance of the first variable capacitor, a conductance of the source, and an equivalent conductance of the first inductor and the third variable capacitor;
(c) when the source impedance is less than the real part of the load impedance or when a calculated capacitance of the first variable capacitor is less than a minimum capacitance:
(i) setting a capacitance value of the first variable capacitor to be a minimum capacitance of the first variable capacitor;
and
(ii) determining a capacitance value of the second variable capacitor based on a predetermined relationship between the capacitance of the second variable capacitor, a minimum susceptance of the first variable capacitor, an impedance of the source, a conductance of the load, and a susceptance of the load;
(d) determining a capacitive value of the third variable capacitor based on a predetermined relationship between the capacitance of the third variable capacitor, an inductance of the first inductor, and an equivalent series inductance of the first inductor and the third variable capacitor;
(e) adjusting the capacitance value of one or more of the first variable capacitor, second variable capacitor, or third variable capacitor if the capacitance value is less than a minimum capacitance or greater than a maximum capacitance for the first variable capacitor, second variable capacitor, or third variable capacitor, respectively;
and
(f) setting the capacitances of the first variable capacitor, the second variable capacitor, and the third variable capacitor to be equal to the respective capacitance values.

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Dependencies are inferred from the claim text.

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Abstract

(a) comparing a source impedance of a source connected to the first node to a real part of a load impedance of a load connected to the second node;
(b) when the source impedance is greater than the real part of the load impedance or when a calculated capacitance of the second variable capacitor is less than a minimum capacitance:
(i) setting a capacitance value of the second variable capacitor to be a minimum capacitance of the second variable capacitor;
and
(ii) determining a capacitance value of the first variable capacitor based on a predetermined relationship between the capacitance of the first variable capacitor, a conductance of the source, and an equivalent conductance of the first inductor and the third variable capacitor;
(c) when the source impedance is less than the real part of the load impedance or when a calculated capacitance of the first variable capacitor is less than a minimum capacitance:
(i) setting a capacitance value of the first variable capacitor to be a minimum capacitance of the first variable capacitor;
and
(ii) determining a capacitance value of the second variable capacitor based on a predetermined relationship between the capacitance of the second variable capacitor, a minimum susceptance of the first variable capacitor, an impedance of the source, a conductance of the load, and a susceptance of the load;
(d) determining a capacitive value of the third variable capacitor based on a predetermined relationship between the capacitance of the third variable capacitor, an inductance of the first inductor, and an equivalent series inductance of the first inductor and the third variable capacitor;
(e) adjusting the capacitance value of one or more of the first variable capacitor, second variable capacitor, or third variable capacitor if the capacitance value is less than a minimum capacitance or greater than a maximum capacitance for the first variable capacitor, second variable capacitor, or third variable capacitor, respectively;
and
(f) setting the capacitances of the first variable capacitor, the second variable capacitor, and the third variable capacitor to be equal to the respective capacitance values.

10 more elements