Method to Increase the Tuneability of Varactors
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Accused Products
Abstract
The present invention relates to a tunable circuit, or admittance, arrangement comprising at least one capacitive branch with at least a tunable first capacitor, and tuning application means. It further comprises at least one resonant branch comprising at least a second capacitor and an inductor, said second capacitor and said inductor being connected in series. Said at least one capacitive branch and said at least one resonant branch are connected in parallel, and said tuning application means are adapted for application of a DC tuning voltage. The capacitance of said first and/or second capacitor and/or the inductance of said inductor are selected such that the frequency dependency of the tunability of a varactor arrangement forming the equivalent varactor arrangement of the admittance arrangement can be controlled at least in a selected frequency range.
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Citations
48 Claims
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1-24. -24. (canceled)
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25. A tunable circuit comprising:
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at least one capacitive branch with at least a tunable first capacitor and tuning application means; at least one resonant branch comprising at least a second capacitor and an inductor, said second capacitor and said inductor being connected in series, wherein said at least one capacitive branch and said at least one resonant branch are connected in parallel, said tuning application means being adapted for application of a DC tuning voltage; and
wherein the capacitance of said first and/or second capacitor and/or the inductance of said inductor are selected such that the frequency dependency of the tunability of a varactor arrangement forming the equivalent varactor arrangement can be controlled at least in a selected frequency range. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method of providing a tunable circuit or admittance arrangement comprising the steps of:
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providing a capacitive branch with at least one tunable first capacitor, providing a resonant branch with at least a tunable second resonator and an inductor in series; connecting said capacitive and resonant branches in parallel; establishing a frequency range, while giving the maximum allowable tolerance or frequency dependent deviation of a varactor forming the equivalent varactor of the tunable circuit or admittance arrangement; and selecting the capacitance of the first and second capacitors and the inductance of the inductor so in dependence of one another that the frequency dependency of tunability of the equivalent varactor arrangement can be controlled. - View Dependent Claims (45, 46, 47, 48)
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Specification