Varactor with extended tuning range
First Claim
1. A device for high-frequency and/or radio-frequency tuning comprising a single IC-package having an rf input port and an rf output port with a signal path therebetween, said package containing:
- a first variable capacitor connected in the signal path between the input and output ports, having its first electrode connected to the input port and its second electrode connected to the output port, the first variable capacitor being controllable via a control path isolated from the signal path;
a plurality of second fixed capacitors; and
a plurality of digitally controllable switching means for individually connecting and disconnecting said second fixed capacitors into or from the signal path, in parallel to and across the first variable capacitor, the second fixed capacitors being arranged in a logarithmic scale, and the first variable capacitor matching the lowest range of the logarithmic scale; and
the first and second capacitors and switching means being fabricated as a single integrated MEMS technology arrangement.
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Abstract
The invention proposes a device for high-frequency and/or radio-frequency tuning comprising within one IC-package a first variable capacitor (C1) and at least one second capacitor (C2), each of the at least one second capacitor (C2) being fixed or variable respectively, at least one signal path connected to the first variable capacitor (C1) and providing at least one input and one output port (rf-port1, rf-port2) and at least one controllable switching means (SC2) for individually connecting and disconnecting at least one of the at least one second capacitor (C2) into the signal path or from the signal path, in particular in parallel to the first variable capacitor (C1).
28 Citations
10 Claims
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1. A device for high-frequency and/or radio-frequency tuning comprising a single IC-package having an rf input port and an rf output port with a signal path therebetween, said package containing:
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a first variable capacitor connected in the signal path between the input and output ports, having its first electrode connected to the input port and its second electrode connected to the output port, the first variable capacitor being controllable via a control path isolated from the signal path; a plurality of second fixed capacitors; and a plurality of digitally controllable switching means for individually connecting and disconnecting said second fixed capacitors into or from the signal path, in parallel to and across the first variable capacitor, the second fixed capacitors being arranged in a logarithmic scale, and the first variable capacitor matching the lowest range of the logarithmic scale; and the first and second capacitors and switching means being fabricated as a single integrated MEMS technology arrangement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification