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US 7,646,264 B2Granted
Varactor tunable RF filters having low distortion and high signal level capability
AssigneeBroadband Innovations, Inc.
InventorBranislav Petrovic
Life of this patent
Estimating the term…
Abstract
An agile frequency converter provides IF-RF level exchange and notch filtering. System noise and spurious levels generated by channel frequency conversion is reduced in applications requiring broadband combining of frequency converters to form multichannel composite signal. A pair of varactor banks is connected in an arrangement whereby varactor pairs are connected in parallel and capacitor pairs are connected in anti-parallel. Tuning is achieved by circuitry for tuning first and second varactors.
Claims12
An anti-parallel variable-capacitor (varactor) circuit comprising:
- a first varactor bank comprising one or more varactors connected in parallel with the same polarity orientation;
- a second varactor bank comprising one or more varactors connected in parallel with the same polarity orientation;
- a first capacitor pair comprising the first varactor bank connected in series with a first fixed capacitor;
- a second capacitor pair comprising the second varactor bank connected in series with a second fixed capacitor;
- said first capacitor pair connected in anti-parallel with said second capacitor pair, said varactor banks having mutually opposite polarity orientations relative to signal flow direction;
- circuitry for tuning said first and second varactors;
- an input terminal coupled to one side of said parallel connection of said first and second capacitor pairs;
- and
- an output terminal coupled to the other side of said parallel connection of said first and second capacitor pairs,
- a circuit including at least one varactor operatively connected in parallel to said first varactor bank by electronically controlled switching;
- and
- a circuit including at least one varactor connected in parallel to said second varactor bank by electronically controlled switching.
9 more elements
A band-reject device comprising:
- a first varactor bank comprising one or more varactors connected in parallel with the same polarity orientation;
- a second varactor bank comprising one or more varactors connected in parallel with the same polarity orientation;
- a first capacitor pair comprising the first varactor bank connected in series with a first fixed capacitor;
- a second capacitor pair comprising the second varactor bank connected in series with a second fixed capacitor;
- said first capacitor pair connected in anti-parallel with said second capacitor pair, said varactor banks having mutually opposite polarity orientations relative to signal flow direction;
- an inductor connected in parallel to said anti-parallel connection of said capacitor pairs;
- circuitry for tuning said first and second varactors;
- an input terminal coupled to one side of said parallel connection of said inductor and said anti-parallel connection of said capacitor pairs;
- and
- an output terminal coupled to the other side of said parallel connection of said inductor and said anti-parallel connection of said capacitor pairs,
- a circuit including at least one inductor operatively connected in parallel to said first inductor by electronically controlled switching;
- a circuit including at least one varactor operatively connected in parallel to said first varactor bank by electronically controlled switching;
- and
- a circuit including at least one varactor connected in parallel to said second varactor bank by electronically controlled switching.
11 more elements
Dependencies are inferred from the claim text.