Biasing circuit for capacitor switch transistor and method therefore
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorAndreas Kämpe
Life of this patent
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Abstract
A biasing circuit for biasing a switching transistor, wherein the switching transistor is used for switching a respective capacitor cell into/out of a capacitor array, wherein the capacitor array comprises one or more such capacitor cells, and wherein the capacitor array is coupled in parallel with a primary inductor to form an inductive/capacitive tank. The biasing circuit comprises a secondary inductor which is inductively coupled to the primary inductor, the secondary inductor configured to provide a bias signal for biasing the switching transistor.
Claims22
A biasing circuit for biasing a switching transistor, wherein the switching transistor is used for switching a respective capacitor cell into/out of a capacitor array, wherein the capacitor array comprises one or more such capacitor cells, and wherein the capacitor array is coupled in parallel with a primary inductor to form an inductive/capacitive tank, the biasing circuit comprising:
- a secondary inductor which is inductively coupled to the primary inductor, the secondary inductor configured to provide a bias signal for biasing the switching transistor.
A method of biasing a switching transistor used for switching a respective capacitor cell into/out of a capacitor array, wherein the capacitor array comprises one or more such capacitor cells, and wherein the capacitor array is coupled in parallel with a primary inductor to form an inductive/capacitive tank, the method comprising:
- inductively coupling a secondary inductor to the primary inductor, and biasing the switching transistor using the secondary inductor.
An inductive/capacitive tank comprising:
- a primary inductor;
- a capacitor array coupled in parallel to the primary inductor, the capacitor array comprising one or more capacitor cells;
- a switching transistor for switching a respective capacitor cell into/out of the capacitor array;
- and
- a biasing circuit comprising a secondary inductor which is inductively coupled to the primary inductor, the secondary inductor configured to provide a bias signal for biasing the switching transistor.
Dependencies are inferred from the claim text.