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US 6,639,481 B1Granted
Transformer coupled quadrature tuned oscillator
AssigneeIntel Corporation
InventorsAshoke Ravi, Krishnamurthy Soumyanath
Life of this patent
Estimating the term…
Abstract
First and second oscillator cells include tank circuits that may be tuned to a desired resonant frequency using varactors as variable reactance devices in a phase-shifting network. First and second transformers are connected to the oscillator cells to control the varactors.
Claims20
An apparatus comprising:
- first and second oscillator circuits, the first oscillator circuit having output terminals coupled to provide an in-phase signal and the second oscillator circuit having output terminals to provide a quadrature signal;
- and
- first and second transformers, the first transformer having primary windings to couple the in-phase signal to the second oscillator circuit and the second transformer having primary windings to couple the quadrature signal to the first oscillator circuit.
A transceiver, comprising:
- an antenna to receive a signal;
- and
- a mixer coupled to the antenna and to an oscillator circuit to receive a quadrature oscillator signal, where the oscillator circuit includes,
- first and second transformers, and
- first and second oscillators, the first oscillator to receive the signal that is further coupled through the first transformer to the second oscillator and the second oscillator to generate the quadrature oscillator signal that is coupled through the second transformer to the first oscillator.
2 more elements
A circuit, comprising:
- first and second transformers;
- and
- first and second oscillators, the first oscillator to provide an in-phase signal at first output terminals that is coupled through the first transformer to the second oscillator and the second oscillator to provide a quadrature signal at second output terminals that is coupled through the second transformer to the first oscillator.
A method comprising:
- using a first transformer to couple an in-phase signal provided by a first oscillator to variable reactance devices in a second oscillator;
- using a second transformer to couple a quadrature signal provided by the second oscillator to variable reactance devices in the first oscillator;
- and
- combining the in-phase signal with a signal phase shifted from the quadrature signal by the variable reactance devices in the second oscillator.
1 more element
Dependencies are inferred from the claim text.