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US 8,264,288 B2Granted
Quadrature voltage controlled oscillator including transmission line
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsYu-Ling Lin, Ying-Ta Lu, Hsiao-Tsung Yen, Ho-Hsiang Chen, Chewn-Pu Jou, Fu-Lung Hsueh
Life of this patent
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Abstract
A circuit includes an oscillator circuit including a first oscillator and a second oscillator. The first and the second oscillators are configured to generate signal having a same frequency and different phases. A transmission line is coupled between the first and the second oscillators.
Claims14
A circuit comprising:
- an oscillator circuit comprising a first oscillator and a second oscillator, wherein the first and the second oscillators are configured to generate signals having a same frequency and different phases;
- and
- a first transmission line coupled between the first and the second oscillators, wherein the first transmission line comprises a first end connected to a first harmonic node of the first oscillator, and a second end connected to a second harmonic node of the second oscillator, with the first and the second harmonic nodes have a phase difference equal to about 180 degrees, and wherein the length of the first transmission line is equal to a half of a wavelength of harmonic signals generated on the first and the second harmonic nodes.
A circuit comprising:
- a quadrature voltage controlled oscillator (QVCO) circuit comprising:
- a first oscillator comprising a first quadrature node and a second quadrature node, and a first harmonic node, wherein the first oscillator is configured to generate oscillating signals having a first frequency on the first and the second quadrature nodes, and a first harmonic signal on the first harmonic node, and wherein the first harmonic signal has a second frequency twice the first frequency;
- a second oscillator comprising a third quadrature node and a fourth quadrature node, and a second harmonic node, wherein the second oscillator is configured to generate oscillating signals having the first frequency on the third and the fourth quadrature nodes, and a second harmonic signal having the second frequency on the second harmonic node;
- and
- a first transmission line connected to the first harmonic node and coupled to the second harmonic node, wherein the first transmission line has a length equal to one fourth or a half of a wavelength of the first and the second harmonic signals.
2 more elements
A circuit comprising:
- an oscillator circuit comprising:
- a first oscillator comprising a first node;
- a second oscillator comprising a second node, wherein the first and the second oscillators are substantially identical to each other, and wherein the oscillator circuit is configured to generate a first signal on the first node, and a second signal on the second node, with the first and the second signals having a same frequency, and a phase difference of 180 degrees;
- a transmission line having a length equal to a half of a wavelength of the first and the second signals, with a first end of the transmission line connected to the first node, and a second end of the transmission line connected to the second node;
- and
- a current source connected between the transmission line and a VSS node.
3 more elements
Dependencies are inferred from the claim text.