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US 10,855,296 B2Granted
Calibrating an injection locked oscillator
AssigneeInfineon Technologies AG
InventorsMatteo Bassi, Giovanni Boi, Dmytro Cherniak, Fabio Padovan
Life of this patent
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Abstract
A circuit for calibrating an injection locked oscillator is provided. The injection locked oscillator includes an injection locking input, an LC tank and an oscillator output to output an oscillator output signal. The circuit is configured to adjust a capacitance of the LC tank to different values, detect an amplitude of the oscillator output signal for each value of the different values of the capacitance while an input signal having a target frequency is applied to the injection locking input, determine a maximum amplitude of the detected amplitudes, and select a value for operating the injection locked oscillator based on the determined maximum amplitude.
Claims27
A circuit configured to calibrate an injection locked oscillator, the injection locked oscillator comprising an injection locking input, an LC tank, and an oscillator output configured to output an oscillator output signal, the circuit configured to:
- adjust a capacitance of the LC tank to different values while the injection locked oscillator is turned on;
- while the injection locked oscillator is turned on, detect an amplitude of the oscillator output signal for each value of the different values of the capacitance while an input signal having a target frequency is applied to the injection locking input;
- determine a maximum amplitude based on the detected amplitudes;
- and
- select a value for operating the injection locked oscillator based on the determined maximum amplitude.
2 more elements
An injection locked oscillator circuit, comprising:
- an injection locked oscillator configured to receive an input signal having a target frequency at an injection locking input thereof, the injection locked oscillator comprising an LC tank having an adjustable capacitance, a control input configured to receive a control signal to adjust the capacitance of the LC tank, and an oscillator output configured to output an oscillator output signal;
- and
- a circuit configured to calibrate the injection locked oscillator while the injection locked oscillator is turned on, wherein the circuit is configured to:
- adjust a capacitance of the LC tank to different values while the injection locked oscillator is turned on,
- while the injection locked oscillator is turned on, detect an amplitude of the oscillator output signal for each value of the different values of the capacitance while an input signal having a target frequency is applied to the injection locking input,
- determine a maximum amplitude of the detected amplitudes, and
- select a value for operating the injection locked oscillator based on the determined maximum amplitude, and
- wherein the circuit is coupled to the oscillator output and the control input of the injection locked oscillator, and is configured to apply a control signal corresponding to the selected value to the control input in a normal operation of the injection locked oscillator.
5 more elements
A frequency multiplier, comprising:
- a local oscillator (LO) configured to output a LO signal having a LO frequency;
- a harmonic generator coupled to the local oscillator to receive the LO signal and configured to generate at an output thereof a generator output signal at a frequency which is a multiple of the LO frequency;
- and
- an injection locked oscillator comprising:
- an injection locked oscillator configured to receive an input signal having a target frequency at an injection locking input thereof, the injection locked oscillator comprising an LC tank having an adjustable capacitance, a control input configured to receive a control signal to adjust the capacitance of the LC tank, and an oscillator output configured to output an oscillator output signal;
- and
- a circuit configured to calibrate the injection locked oscillator while the injection locked oscillator is turned on, wherein the circuit is configured to:
- adjust a capacitance of the LC tank to different values while the injection locked oscillator is turned on,
- while the injection locked oscillator is turned on, detect an amplitude of the oscillator output signal for each value of the different values of the capacitance while an input signal having a target frequency is applied to the injection locking input,
- determine a maximum amplitude of the detected amplitudes, and
- select a value for operating the injection locked oscillator based on the determined maximum amplitude,
- wherein the circuit is coupled to the oscillator output and the control input of the injection locked oscillator, and is configured to apply a control signal corresponding to the selected value to the control input in a normal operation of the injection locked oscillator, and
- wherein the injection locked oscillator is coupled to the harmonic generator to receive the generator output signal at the injection locking input thereof.
10 more elements
A frequency divider, comprising:
- a local oscillator (LO) configured to output a LO signal having a LO frequency;
- a divider circuit coupled to the local oscillator to receive the LO signal and configured to generate at an output thereof a divider circuit output signal at a frequency that is a fraction of the LO frequency;
- an injection locked oscillator circuit comprising:
- an injection locked oscillator configured to receive an input signal having a target frequency at an injection locking input thereof, the injection locked oscillator comprising an LC tank having an adjustable capacitance, a control input configured to receive a control signal to adjust the capacitance of the LC tank, and an oscillator output configured to output an oscillator output signal;
- and
- a circuit configured to calibrate the injection locked oscillator while the injection locked oscillator is turned on, wherein the circuit is configured to:
- adjust a capacitance of the LC tank to different values while the injection locked oscillator is turned on,
- while the injection locked oscillator is turned on, detect an amplitude of the oscillator output signal for each value of the different values of the capacitance while an input signal having a target frequency is applied to the injection locking input,
- determine a maximum amplitude of the detected amplitudes, and
- select a value for operating the injection locked oscillator based on the determined maximum amplitude,
- wherein the circuit is coupled to the oscillator output and the control input of the injection locked oscillator, and is configured to apply a control signal corresponding to the selected value to the control input in a normal operation of the injection locked oscillator, and
- wherein the injection locked oscillator is coupled to the frequency divider to receive the frequency divider output signal at the injection locking input thereof.
9 more elements
An amplifier, comprising:
- an injection locked oscillator circuit comprising:
- an injection locked oscillator configured to receive an input signal having a target frequency at an injection locking input thereof, the injection locked oscillator comprising an LC tank having an adjustable capacitance, a control input configured to receive a control signal to adjust the capacitance of the LC tank, and an oscillator output configured to output an oscillator output signal;
- and
- a circuit configured to calibrate the injection locked oscillator while the injection locked oscillator is turned on, wherein the circuit is configured to:
- adjust a capacitance of the LC tank to different values while the injection locked oscillator is turned on,
- while the injection locked oscillator is turned on, detect an amplitude of the oscillator output signal for each value of the different values of the capacitance while an input signal having a target frequency is applied to the injection locking input,
- determine a maximum amplitude of the detected amplitudes, and
- select a value for operating the injection locked oscillator based on the determined maximum amplitude, and
- wherein the circuit is coupled to the oscillator output and the control input of the injection locked oscillator, and is configured to apply a control signal corresponding to the selected value to the control input in a normal operation of the injection locked oscillator.
6 more elements
A method of calibrating an injection locked oscillator comprising an LC tank, the method comprising:
- applying an input signal having a target frequency to an injection locking input of the injection locked oscillator while the injection locked oscillator is turned on;
- adjusting a capacitance of the LC tank to different values while the injection locked oscillator is turned on;
- while the injection locked oscillator is turned on, detecting an amplitude of an output signal of the injection locked oscillator for each value of the different values of the capacitance while the input signal having the target frequency is applied to the injection locking input;
- determining a maximum amplitude of the detected amplitudes;
- and
- selecting a value for operating of the injection locked oscillator based on the determined maximum amplitude.
3 more elements
Dependencies are inferred from the claim text.