Oscillator circuit
AssigneeInfineon Technologies AG
InventorTindaro Pittorino
Life of this patent
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Abstract
The invention is directed to an oscillator circuit in which a frequency-determining resonant circuit includes an inductive element, a first capacitive element and at least one second capacitive element which is connected in series with the first capacitive element. A node is provided between the first capacitive element and at least one second capacitive element. The oscillator circuit contains a damping reduction amplifier which is arranged in parallel with the frequency-determining resonant circuit. In addition, the oscillator circuit has a first tuneable capacitive element, which is connected in parallel with the first capacitive element of the resonant circuit and has a connection connected to the node.
Claims18
An oscillator circuit, comprising:
- a frequency-determining resonant circuit comprising an inductive element, a first capacitive element, and at least one second capacitive element that is connected in series with the first capacitive element, thereby defining a node therebetween;
- a damping reduction amplifier coupled in parallel with the frequency-determining resonant circuit;
- a first tuneable capacitive element coupled in parallel with the at least one second capacitive element and coupled to the node;
- a second tuneable capacitive element coupled in parallel with the inductive element of the resonant circuit.
A phase locked loop circuit, comprising:
- a phase detector configured to compare a reference signal and a divided feedback signal, and output a control signal in response thereto;
- a frequency divider configured to receive an output signal and generate the divided feedback signal based on the output signal;
- and
- a controlled oscillator configured to generate the output signal as a function of the control signal, wherein the controlled oscillator comprises:
- a resonant circuit comprising an inductive element in parallel with first and second series-connected capacitances, and a first tuneable capacitance element coupled in parallel with the second capacitance.
Dependencies are inferred from the claim text.