Varactor bank switching based on anti-parallel branch configuration
AssigneeInternational Business Machines Corporation
InventorsMarcel A. Kossel, Thomas E. Morf, Jonas R. Weiss
Life of this patent
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Abstract
A system and apparatus for varactor bank switching for a voltage controlled oscillator, is disclosed. Varactor bank switching involves partitioning a varactor bank switch into two anti-parallel branches, wherein each branch comprises a pass-gate circuit that is series-connected to a fixed varactor or capacitor; and maintaining an output common mode voltage of an actual oscillator signal at the varactor-side terminal of each pass-gate circuit, such that a threshold voltage of the switch transistor in the pass-gate circuit is not exceeded and the switch remains in an off-state.
Claims1
A method of varactor bank switching for a voltage controlled oscillator, comprising:
- partitioning a varactor bank switch into two anti-parallel branches, wherein each branch comprises a pass-gate circuit that is series-connected to a fixed varactor or capacitor;
- and
- maintaining an output common mode voltage of an actual oscillator signal at the varactor-side terminal of each pass-gate circuit, such that a threshold voltage of the switch transistor in the pass-gate circuit is not exceeded and the switch remains in an off-state.
Dependencies are inferred from the claim text.