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US 9,425,739 B1Granted
Tunable quadrature oscillator
AssigneeTexas Instruments Incorporated
InventorsBradley Allen Kramer, Nirmal C. Warke, Hassan Ali, Swaminathan Sankaran
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Abstract
A tunable quadrature oscillator includes a first oscillator having an output, a second oscillator having an output, and a variable gain amplifier. The variable gain amplifier includes an input coupled to the output of the second oscillator, and an output inductively coupled to the output of the first oscillator.
Claims18
A device comprising:
- a first oscillator having:
- a first output, and
- a second output;
- a second oscillator having:
- a first output, and
- a second output;
- a first coupling circuit having:
- a first input coupled to the second output of the second oscillator,
- a second input coupled to the first output of the second oscillator,
- a first output coupled to the first output of the first oscillator, and
- a second output coupled to the second output of the first oscillator;
- a second coupling circuit having:
- a first input coupled to the first output of the first oscillator,
- a second input coupled to the second output of the first oscillator,
- a first output coupled to the first output of the second oscillator, and
- a second output coupled to the second output of the second oscillator;
- a first variable gain amplifier having:
- a first input coupled to the second output of the second oscillator,
- a second input coupled to the first output of the second oscillator,
- a first output inductively coupled to the first output of the first oscillator,
- a second output inductively coupled to the second output of the first oscillator, and
- a gain input coupled to an adjustable frequency tuning signal;
- and
- a second variable gain amplifier having:
- a first input coupled to the first output of the first oscillator,
- a second input coupled to the second output of the first oscillator,
- a first output inductively coupled to the first output of the second oscillator,
- a second output inductively coupled to the second output of the second oscillator, and
- a gain input coupled to the adjustable frequency tuning signal.
26 more elements
A device comprising:
- a first oscillator having an output;
- a second oscillator having an output;
- a coupling circuit having:
- an input coupled to the output of the second oscillator, and
- an output directly coupled to the output of the first oscillator;
- and
- a variable gain amplifier having:
- an input coupled to the output of the second oscillator, and
- an output inductively coupled to the output of the first oscillator.
6 more elements
A method comprising:
- amplifying an output of a first oscillator with a gain that is determined based on an adjustable gain parameter to generate a first amplified output signal;
- inductively coupling the first amplified output signal to an output of a second oscillator;
- amplifying the output of the first oscillator to generate a second amplified output signal;
- and
- directly coupling the second amplified output signal to the output of the second oscillator.
2 more elements
A device comprising circuitry configured to:
- amplify an output of a first oscillator with a gain that is determined based on an adjustable gain parameter to generate a first amplified output signal;
- inductively couple the first amplified output signal to an output of a second oscillator;
- amplify the output of the first oscillator to generate a second amplified output signal;
- and
- directly couple the second amplified output signal to the output of the second oscillator.
2 more elements
Dependencies are inferred from the claim text.