Series-resonance oscillator
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsPietro Andreani, Luca Fanori, Thomas Mattsson
Life of this patent
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Abstract
An oscillator circuit comprises a first tank circuit comprising an inductive element and a capacitive element coupled in series between a first voltage rail and a first drive node. A feedback stage is coupled to a first tank output of the first tank circuit and to the first drive node. The feedback stage is arranged to generate, responsive to a first oscillating tank voltage present at the first tank output, a first oscillating drive voltage at the first drive node in-phase with a first oscillating tank current flowing in the inductive element and the capacitive element, thereby causing the oscillator to oscillate in a series resonance mode of the inductive element and the capacitive element.
Claims28
An oscillator circuit comprising:
- a first tank circuit comprising an inductive element and a capacitive element coupled in series between a voltage rail and a first drive node;
- and
- a feedback stage coupled to a first tank output of the first tank circuit and to the first drive node;
- wherein the feedback stage is arranged to generate, responsive to a first oscillating tank voltage present at the first tank output, a first oscillating drive voltage at the first drive node in-phase with an oscillating tank current flowing in the inductive element and the capacitive element, thereby causing the oscillator circuit to oscillate in a series resonance mode of the inductive element and the capacitive element.
A wireless communication device comprising:
- an oscillator circuit comprising:
- a first tank circuit comprising an inductive element and a capacitive element coupled in series between a voltage rail and a first drive node;
- and
- a feedback stage coupled to a first tank output of the first tank circuit and to the first drive node;
- wherein the feedback stage is arranged to generate, responsive to a first oscillating tank voltage present at the first tank output, a first oscillating drive voltage at the first drive node in-phase with an oscillating tank current flowing in the inductive element and the capacitive element, thereby causing the oscillator circuit to oscillate in a series resonance mode of the inductive element and the capacitive element.
A method of operating an oscillator circuit, the oscillator circuit comprising a first tank circuit comprising an inductive element and a capacitive element coupled in series between a first voltage rail and a first drive node, the method comprising generating, responsive to a first oscillating tank voltage present at a first tank output, a first oscillating drive voltage at the first drive node, wherein the first oscillating drive voltage is in-phase with a first oscillating tank current flowing in the inductive element and the capacitive element, thereby causing the oscillator to oscillate in a series resonance mode of the inductive element and the capacitive element.
Dependencies are inferred from the claim text.