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US 2023/0057043 A1Published application
Transceiver and transceiver calibration method
AssigneeRealtek Semiconductor Corp.
InventorsBISHEN TSENG, MENG CHE LI
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Abstract
The application discloses a transceiver, including a calibration signal generation unit, a transmission unit, a receiving unit and a control unit. The calibration signal generation unit generates test signal to the transmission unit in a phase calibration mode. The receiving unit generates a digital receiving signal. The control unit calculates a phase difference between the digital receiving signal and a given reference phase and selectively adjust the transmission unit or the receiving unit accordingly. The application discloses a transceiver calibration method as well.
Claims20
A transceiver, comprising:
- a calibration signal generation unit, configured to generate a test signal to a transmission unit in a phase calibration mode;
- the transmission unit, includes:
- a digital-to-analog converter, configured to generate an analog test signal according to the test signal;
- a first IQ clock generator, configured to generate a first clock and a second clock according to a reference clock, wherein the first clock and the second clock have a same frequency and a phase difference of 90 degrees;
- a fixed phase frequency divider, configured to generate a third clock according to the reference clock, wherein a phase delay caused by the fixed phase frequency divider is fixed;
- and
- a frequency upconverter, configured to upconvert the analog test signal to a frequency up-converted signal according to the first clock or the third clock;
- a receiving unit, wherein in the phase calibration mode, the receiving unit is coupled to the transmission unit via a wire, and the receiving unit includes:
- a second IQ clock generator, configured to generate a fourth clock and a fifth clock according to the reference clock, wherein the fourth clock and the fifth clock have a same frequency and a phase difference of 90 degrees;
- and
- a frequency downconverter, configured to generate a frequency down-converted signal according to the frequency up-converted signal and the fourth clock;
- an analog-to-digital converter, configured to generate a digital receiving signal according to the frequency down-converted signal;
- and
- a control unit, configured to calculate a phase difference between the digital receiving signal and a known reference phase, and selectively adjust the first IQ clock generator to change the phases of the first clock and the second clock, or selectively adjust the second IQ clock generator to change the phases of the fourth clock and the fifth clock, accordingly.
11 more elements
A transceiver calibration method, comprising:
- generating a test signal in a phase calibration mode;
- generating an analog test signal according to the test signal;
- generating a first clock and a second clock according to a reference clock, wherein the first clock and the second clock have a same frequency and a phase difference of 90 degrees;
- using a fixed phase frequency divider to generate a third clock according to the reference clock, wherein a phase delay caused by the fixed phase frequency divider is fixed;
- upconverting the analog test signal to a frequency up-converted signal according to the first clock or the third clock;
- generating a fourth clock and a fifth clock according to the reference clock, wherein the fourth clock and the fifth clock have a same frequency and a phase difference of 90 degrees;
- generating a frequency down-converted signal according to the frequency up-converted signal and the fourth clock;
- generating a digital receiving signal according to the frequency down-converted signal;
- and
- calculating a phase difference between the digital receiving signal and known reference phase, and selectively changing the phases of the first clock and the second clock, or selectively changing the phases of the fourth clock and the fifth accordingly.
7 more elements
Dependencies are inferred from the claim text.