Voltage controlled oscillator circuit, device, and method
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsChi-Hsien LIN, Ho-Hsiang CHEN, Hsien-Yuan LIAO, Tzu-Jin YEH, Ying-Ta LU
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Abstract
A voltage-controlled oscillator (VCO) includes a power supply node configured to have a power supply voltage. A reference node is configured to have a first reference voltage. A transformer-coupled band-pass filter (BPF) is coupled to a cross-coupled pair of transistors. The cross-coupled pair of transistors and the transformer-coupled band-pass filter are positioned between the power supply node and the reference node.
Claims20
A voltage-controlled oscillator (VCO) comprising:
- a power supply node configured to have a power supply voltage;
- a reference node configured to have a first reference voltage;
- a cross-coupled pair of transistors;
- and
- a transformer-coupled band-pass filter (BPF) coupled to the cross-coupled pair of transistors,
- wherein the cross-coupled pair of transistors and the transformer-coupled band-pass filter are positioned between the power supply node and the reference node.
A band-pass filter (BPF) comprising:
- a first conductive structure in a first metal layer of an integrated circuit (IC), the first conductive structure comprising:
- a first terminal at a first end of the first conductive structure;
- and
- second and third terminals at a second end of the first conductive structure opposite the first end of the first conductive structure;
- a second conductive structure in the first metal layer, the second conductive structure comprising:
- an input terminal positioned between the second and third terminals at a first end of the second conductive structure;
- and
- a plurality of extending portions positioned at a second end of the second conductive structure opposite the first end of the second conductive structure , wherein the extending portions extend from the input terminal to the first terminal in a direction opposite each other;
- a third conductive structure in the first metal layer, wherein a first end of the third conductive structure is connected to one of the plurality of extending portions of the second conductive structure, and a second end of the third conductive structure is positioned opposite the first end of the third conductive structure, the second end of the third conductive structure defines a fourth terminal;
- and
- a fourth conductive structure in the first metal layer positioned opposite the third conductive structure, wherein a first end of the fourth conductive structure is connected to another of the plurality of extending portions of the second conductive structure, and a second end of the fourth conductive structure is positioned opposite the first end of the fourth conductive structure, the second end of the fourth conductive structure defines a fifth terminal,
- wherein
- the second terminal is between the fourth terminal and the input terminal,
- and
- the third terminal is between the fifth terminal and the input terminal.
A method of generating an oscillation signal, the method comprising:
- receiving an input voltage at an input terminal of a transformer-coupled band-pass filter (BPF);
- receiving a power supply voltage at a power supply input of the transformer-coupled BPF;
- coupling the transformer-coupled BPF with a reference voltage through a cross-coupled transistor pair;
- and
- producing the oscillation signal whose frequency synchronizes with the frequency of the reference voltage.
Dependencies are inferred from the claim text.