Quadrature clock generation with injection locking

A method for quadrature clock generation with injection locking using a digital calibration circuit having a coarse calibration circuit and a fine calibration circuit comprising:

• performing a coarse frequency calibration of a controlled oscillator, wherein the controlled oscillator is coupled to the digital calibration circuit;
• characterizing a replica oscillator signal path associated with an oscillator replica circuit, wherein the oscillator replica circuit is coupled to the controlled oscillator;
• performing a fine frequency calibration of the controlled oscillator by measuring a phase difference between the controlled oscillator and the oscillator replica circuit;
• and
• generating a calibrated set of quadrature clock signals after performing the fine frequency calibration of the controlled oscillator.

An apparatus for quadrature clock generation with injection locking, the apparatus comprising:

• means for performing a coarse frequency calibration of a controlled oscillator, wherein the controlled oscillator is coupled to a digital calibration circuit;
• means for characterizing a replica oscillator signal path associated with an oscillator replica circuit, wherein the oscillator replica circuit is coupled to the controlled oscillator;
• means for performing a fine frequency calibration of the controlled oscillator by measuring a phase difference between the controlled oscillator and the oscillator replica circuit;
• and
• means for generating a calibrated set of quadrature clock signals after performing the fine frequency calibration of the controlled oscillator.

A computer-readable medium storing computer executable code, operable on a device comprising at least one processor and at least one memory coupled to the at least one processor, wherein the at least one processor is configured to implement quadrature clock generation with injection locking, the computer executable code comprising:

• instructions for causing a computer to perform a coarse frequency calibration of a controlled oscillator, wherein the controlled oscillator is coupled to a digital calibration circuit;
• instructions for causing the computer to characterize a replica oscillator signal path associated with an oscillator replica circuit, wherein the oscillator replica circuit is coupled to the controlled oscillator;
• instructions for causing the computer to perform a fine frequency calibration of the controlled oscillator by measuring a phase difference between the controlled oscillator and the oscillator replica circuit;
• and
• instructions for causing the computer to generate a calibrated set of quadrature clock signals after performing the fine frequency calibration of the controlled oscillator.