System and method for a VCO
First Claim
1. A method of operating a voltage controlled oscillator (VCO) comprising a VCO core coupled to a filtered current source, wherein the filtered current source comprises a current source, and a tunable filter coupled between the VCO core and the current source, the method comprising:
- setting an oscillation frequency of the VCO core based on a tuning signal received at a tuning signal input; and
setting a resonant frequency of the filtered current source based on the received tuning signal using a tuning circuit having an input directly connected to the tuning signal input.
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Abstract
In accordance with an embodiment, a method of operating a voltage controlled oscillator (VCO) that having a VCO core coupled to a filtered current source includes setting an oscillation frequency of the VCO core based on a tuning signal received at a tuning signal input; and setting a resonant frequency of the filtered current source based on the received tuning signal using a tuning circuit having an input directly connected to the tuning signal input.
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Citations
20 Claims
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1. A method of operating a voltage controlled oscillator (VCO) comprising a VCO core coupled to a filtered current source, wherein the filtered current source comprises a current source, and a tunable filter coupled between the VCO core and the current source, the method comprising:
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setting an oscillation frequency of the VCO core based on a tuning signal received at a tuning signal input; and setting a resonant frequency of the filtered current source based on the received tuning signal using a tuning circuit having an input directly connected to the tuning signal input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15)
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9. A voltage controlled oscillator (VCO) comprising:
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a VCO core; a filtered current source coupled to the VCO core, wherein the filtered current source comprises a first current source, and a tunable filter coupled between the VCO core and the first current source; and a tuning circuit directly connected to a tuning signal input, the tuning circuit configured to set an oscillation frequency of the VCO core based on a tuning signal received at the tuning signal input, and set a resonant frequency of the filtered current source based on the tuning signal. - View Dependent Claims (16)
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17. An integrated circuit comprising:
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a semiconductor substrate; a voltage controlled oscillator (VCO) disposed on the semiconductor substrate, the VCO comprising a cross-coupled transistor pair, a first tunable resonator coupled to the cross-coupled transistor pair, a current source coupled to the cross-coupled transistor pair, and a second tunable resonator coupled between the cross-coupled transistor pair and the current source; and a tuning circuit comprising a tuning input, a first tuning output coupled to a first tuning input of the first tunable resonator, and a second tuning output coupled a second tuning input of the second tunable resonator. - View Dependent Claims (18, 19, 20)
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Specification