HYBRID RESONATOR BASED VOLTAGE CONTROLLED OSCILLATOR (VCO)
First Claim
1. A voltage controlled oscillator (VCO) comprising:
- a negative resistance circuit; and
a hybrid resonator comprising;
a first resonance branch having a first resonance frequency, the first resonance branch comprising at least a first inductor and a first capacitor coupled in series;
a second resonance branch coupled in parallel to the first resonance branch, the second resonance branch comprising at least a second inductor and a second capacitor coupled in series, the second resonance branch having a second resonance frequency, the first resonance frequency being lower than the second resonance frequency; and
a third resonance branch coupled between the negative resistance circuit and the parallel first and second resonance branches, the third resonance branch comprising at least a third inductor and a third capacitor coupled in series.
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Abstract
The invention discloses a voltage controlled oscillator (VCO) based on hybrid resonator, including a hybrid resonator and a negative resistance circuit, wherein the hybrid resonator includes the first LC series resonance branch, the second LC series resonance branch and the third LC series resonance branch. The first LC series resonance branch and the second LC series resonance branch forms a parallel structure, in which one end of the said parallel structure is grounded while the other end is connected to the third LC series resonance branch, and the other end of the third LC series resonance branch is connected to the negative resistance circuit. The resonance frequency of the first LC series resonance branch is lower than that of the second LC series resonance branch. The invented VCO can effectively improve the phase noise, especially maintain a good phase noise with the increase of the tuning frequency.
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Citations
20 Claims
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1. A voltage controlled oscillator (VCO) comprising:
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a negative resistance circuit; and a hybrid resonator comprising; a first resonance branch having a first resonance frequency, the first resonance branch comprising at least a first inductor and a first capacitor coupled in series; a second resonance branch coupled in parallel to the first resonance branch, the second resonance branch comprising at least a second inductor and a second capacitor coupled in series, the second resonance branch having a second resonance frequency, the first resonance frequency being lower than the second resonance frequency; and a third resonance branch coupled between the negative resistance circuit and the parallel first and second resonance branches, the third resonance branch comprising at least a third inductor and a third capacitor coupled in series. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A push-push voltage controlled oscillator (VCO) comprising:
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a pair of single-ended VCOs coupled to each other in a balanced layout for a push-push structure, each single-ended VCO comprising; a negative resistance circuit; and a resonator comprising at least a first resonance branch and a second resonance branch coupled in parallel to the first resonance branch, the first resonance branch having a first resonance frequency lower than a second resonance frequency of the second resonance branch; wherein the first resonance branches of both single-ended VCOs are coupled to each other, and the second resonance branches of both single-ended VCOs are coupled to each other. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method to maintain low phase noise of a voltage controlled oscillator (VCO), the method comprising:
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coupling a first resonance branch and a second resonance branch into a parallel structure, the first resonance branch having a first resonance frequency range between a low end and a high end, the second resonance branch having a second resonance frequency, the first resonance frequency range being lower than the second resonance frequency, the first resonance branch comprising a first inductor and a first variable capacitor coupled in series, the second resonance branch comprising a second inductor and a second capacitor coupled in series; and coupling a third resonance branch between the parallel structure and a negative resistance circuit within the VCO, the third resonance branch comprising a third inductor and a third capacitor coupled in series; wherein the VCO has an overall quality factor (Q value) dominated by the first resonance branch when the VCO operates near the low end of the first resonance frequency range, the second resonance branch contributes more to the overall Q value when the VCO operates near the high end of the first resonance frequency range than when the VCO operates near the low end of the first resonance frequency range. - View Dependent Claims (17, 18, 19, 20)
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Specification