On-chip I-Q imbalance and LO leakage calibration for transceivers
View Patent ↗The disclosure can provide methods and systems for autocalibrating a transceiver. The method can include upconverting a bandpass input signal by mixing the bandpass input signal with a first local oscillator signal to form an initial transmitter signal. The initial transmitter signal can be looped back to a receiver and downconverted with a second local oscillator signal having a frequency that is different from the first local oscillator to form an intermediate frequency signal. At least one of a gain and a phase of the transmitter can be adjusted based on a transmitter image sideband of the intermediate frequency signal to generate a calibrated transmitter signal having minimized transmitter image sideband.
1. A method, comprising:
looping back a first signal to a first receiver;
bypassing one of a first path and a second path of the first receiver;
processing the first signal to form a second signal;
injecting a third signal to a second receiver, the third signal being generated based on at least one of the second signal and a fourth signal.
2. The method of claim 1 , wherein the third signal is generated based on at least one of the fourth signal and a fifth signal, the fifth signal being generated based on the second signal.
3. The method of claim 2 , further comprising:
adjusting a transmitter based on the second signal to generate the fifth signal.
4. The method of claim 1 , further comprising:
processing the third signal in the second receiver to form a sixth signal; and
adjusting the second receiver based on the sixth signal to generate a seventh signal.
5. The method of claim 1 , further comprising:
upconverting a bandpass input signal by mixing the bandpass input signal with a signal of a first local oscillator to form the first signal.
6. The method of claim 5 , wherein the first local oscillator is at least one of an on-chip voltage controlled oscillator and a phase locked loop.
7. The method of claim 5 , wherein processing the first signal further comprises downconverting the first signal with a signal of a second local oscillator having a frequency that is different from the first local oscillator.
8. The method of claim 5 , further comprising:
downconverting the third signal by using the third signal with the first local oscillator.
9. The method of claim 3 , wherein adjusting the transmitter further comprises adjusting at least one of a gain and a phase of the transmitter based on a transmitter image sideband of the second signal.
10. The method of claim 9 , further comprising:
separating the transmitter image sideband from the second signal;
separating a transmitter desired signal from the second signal; and
minimizing a power ratio of the transmitter image sideband to the transmitter desired signal.
11. A device, comprising:
is first circuit configured to route a first signal to a receiver;
a switch configured to bypass one of a first path and a second path of the receiver;
the receiver configured to process the first signal to form a second signal; and
a selector configured to inject a third signal into a second receiver, the third signal being generated based on at least one of the second signal and a fourth signal.
12. The device of claim 11 , wherein the third signal is generated based on at least one of the fourth signal and a fifth signal, the fifth signal being generated based on the second signal.
13. The device of claim 12 , further comprising:
a second circuit configured to adjust a transmitter based on the second signal to generate the fifth signal.
14. The device of claim 11 , further comprising:
the second receiver configured to process the third signal to form a sixth signal; and
a third circuit configured to adjust the second receiver based on the sixth signal to generate a seventh signal.
15. The device of claim 11 , further comprising:
a processor configured to form the first signal and to upconvert a bandpass input signal by mixing the bandpass input signal with is signal of a first local oscillator.
16. The device of claim 15 , wherein the first local oscillator is at least one of an on-chip voltage controlled oscillator and is phase locked loop.
17. The device of claim 15 , wherein the receiver is further configured to downconvert the first signal with a signal of a second local oscillator having a frequency that is different from the first local oscillator.
18. The device of claim 15 , wherein the second receiver is further configured in downconvert the third signal by using the third signal with the first local oscillator.
19. The device of claim 13 , wherein the second circuit is further configured to adjust at least one of a gain and a phase of the transmitter based on a transmitter image sideband of the second signal.
20. The device of claim 19 , further comprising:
a first filter configured to separate the transmitter image sideband from the second signal;
a second filter configured to separate a transmitter desired signal from the second signal; and
a minimizer configured to minimize a power ratio of the transmitter image sideband to the transmitter desired signal.