Systems and methods of polyphase generation
AssigneeTexas Instruments Incorporated
InventorsSudipto Chakraborty, Swaminathan Sankaran
Life of this patent
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Abstract
Example embodiments of the systems and methods of polyphase generation involve quadrature generation in high frequency digital transceivers. An oscillation signal is received and converted to complex variables with lead and lag phase rotation while performing compensation and calibration due to non-idealities of the in-phase and quadrature phase component parts. In addition to orthagonalizating, the quadrature generator also provides signal amplification and filtering. The quadrature phase generation scheme may be extended to odd harmonics of the fundamental frequency at the input.
Claims20
A system comprising:
- a phase shifter block with configurable bias current comprising at least one configurable capacitor, the phase shifter block configured to:
- receive an oscillation signal;
- receive a feedback control signal for adjusting the at least one configurable capacitor and the bias current;
- and
- generating an in phase (I) component and quadrature phase (Q) component from the oscillation signal;
- and
- a calibration block configured to output the feedback control signal based on a vector product of the I and Q components;
- a control circuit configured to adjust the at least one configurable capacitor based on a vector product of the I and Q components.
A method comprising:
- a phase shifter block with configurable bias current comprising at least one configurable capacitor, the phase shifter block configured to:
- receive an oscillation signal;
- generate an in phase (I) component and a quadrature phase (Q) component from the oscillation signal;
- and
- calibrate the generating of the I and Q components based on a vector product of the I and Q components;
- adjust the at least one configurable capacitor based on the vector product of the I and Q components.
A circuit comprising:
- a pair of differential transistors configured to receive an input oscillation signal across the pair and output an in phase (I) component from a first differential transistor of the pair and a quadrature phase (Q) component from a second differential transistor of the pair;
- a first configurable capacitor across the first differential transistor to produce a forty-five degree lead of the input oscillation signal;
- a second configurable capacitor across the second differential transistor to produce a forty-five degree lag of the input oscillation signal;
- and
- a control circuit configured to adjust the first and/or second configurable capacitors based on a vector product of the I and Q components.
Dependencies are inferred from the claim text.