Tranceiver circuit for compensating IQ mismatch and carrier leakage and method for controlling the same
First Claim
1. A method for controlling a transceiver circuit comprising a first up-conversion IQ mixer, a second up-conversion IQ mixer, a first down-conversion IQ mixer, a second down-conversion IQ mixer, a first local oscillator and a second oscillator, the method comprising:
- (a) measuring a Tx carrier leakage using a signal obtained by passing a Tx carrier leakage included in an output of the first up-conversion IQ mixer through the second down-conversion IQ mixer;
(b) measuring a Tx IQ mismatch using a signal being passed through the first up-conversion IQ mixer and the second down-conversion IQ mixer;
(c) measuring a Rx IQ mismatch using a signal being passed through the second up-conversion IQ mixer and the first down-conversion IQ mixer; and
(d) carrying out transmission/reception using the first up-conversion IQ mixer and the first down-conversion IQ mixer during an operation period,wherein the first local oscillator generates a first IQ LO signal used in the first up-conversion IQ mixer and the first down-conversion IQ mixer, and the second oscillator generates a second IQ LO signal used in the second up-conversion IQ mixer and the second down-conversion IQ mixer.
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Accused Products
Abstract
Embodiments of methods, transceiver circuits, and systems can compensate an IQ mismatch (e.g., Tx or Rx) or a carrier leakage using a plurality of local oscillators. One embodiment of a transceiver can include a first up-conversion IQ mixer, a second up-conversion IQ mixer, a first down-conversion IQ mixer with an input to receive an output of the second up-conversion IQ mixer, a second down-conversion IQ mixer with an input to receive an output of the first up-conversion IQ mixer, a first local oscillator to generate a first IQ LO signal for the first up-conversion IQ mixer and the first down-conversion IQ mixer, and a second local oscillator to generate a second IQ LO signal for the second up-conversion IQ mixer and the second down-conversion IQ mixer.
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Citations
21 Claims
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1. A method for controlling a transceiver circuit comprising a first up-conversion IQ mixer, a second up-conversion IQ mixer, a first down-conversion IQ mixer, a second down-conversion IQ mixer, a first local oscillator and a second oscillator, the method comprising:
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(a) measuring a Tx carrier leakage using a signal obtained by passing a Tx carrier leakage included in an output of the first up-conversion IQ mixer through the second down-conversion IQ mixer; (b) measuring a Tx IQ mismatch using a signal being passed through the first up-conversion IQ mixer and the second down-conversion IQ mixer; (c) measuring a Rx IQ mismatch using a signal being passed through the second up-conversion IQ mixer and the first down-conversion IQ mixer; and (d) carrying out transmission/reception using the first up-conversion IQ mixer and the first down-conversion IQ mixer during an operation period, wherein the first local oscillator generates a first IQ LO signal used in the first up-conversion IQ mixer and the first down-conversion IQ mixer, and the second oscillator generates a second IQ LO signal used in the second up-conversion IQ mixer and the second down-conversion IQ mixer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a transceiver circuit comprising a first up-conversion IQ mixer, a first down-conversion IQ mixer, a second down-conversion IQ mixer, a first local oscillator and a second oscillator, the method comprising:
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measuring a Tx carrier leakage using a signal obtained by passing a Tx carrier leakage included in an output of the first up-conversion IQ mixer through the second down-conversion IQ mixer; and performing transmission/reception using the first up-conversion IQ mixer and the first down-conversion IQ mixer during an operation period, wherein the first local oscillator generates a first IQ LO signal used in the first up-conversion IQ mixer and the first down-conversion IQ mixer, and the second oscillator generates a second IQ LO signal used in the second down-conversion IQ mixer. - View Dependent Claims (8)
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9. A method for controlling a transceiver circuit comprising a first up-conversion IQ mixer, a first down-conversion IQ mixer, a second down-conversion IQ mixer, a first local oscillator and a second oscillator, the method comprising:
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measuring a Tx IQ mismatch using a signal being passed through the first up-conversion IQ mixer and the second down-conversion IQ mixer; and carrying out a TDD type transmission/reception using the first up-conversion IQ mixer and the first down-conversion IQ mixer during a normal operation period, wherein the first local oscillator generates a first IQ LO signal used in the first up-conversion IQ mixer and the first down-conversion IQ mixer, and the second oscillator generates a second IQ LO signal used in the second down-conversion IQ mixer. - View Dependent Claims (10)
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11. A method for controlling a transceiver circuit comprising a first up-conversion IQ mixer, a second up-conversion IQ mixer, a first down-conversion IQ mixer, a first local oscillator and a second oscillator, the method comprising:
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measuring a Rx IQ mismatch using a signal being passed through the second up-conversion IQ mixer and the first down-conversion IQ mixer; carrying out a transmission/reception using the first up-conversion IQ mixer and the first down-conversion IQ mixer during an operation period, generating a first IQ LO signal used in the first up-conversion IQ mixer and the first down-conversion IQ mixer using the first local oscillator; and generating a second IQ LO signal used in the second up-conversion IQ mixer using the second oscillator, wherein the second up-conversion IQ mixer and the first down-conversion IQ mixer are operational and the first up-conversion IQ mixer is non-operational when measuring said Rx IQ mismatch, wherein the first up-conversion IQ mixer is operational and the first down-conversion IQ mixer and the second up-conversion IQ mixer are non-operational during a transmission period of the operation period, and wherein the first down-conversion IQ mixer is operational and the first up-conversion IQ mixer and the second up-conversion IQ mixer are non-operational during a reception period of the normal operation period, and wherein frequencies of the first IQ LO signal and the second IQ LO signal are different.
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12. A transceiver circuit, comprising:
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a first up-conversion IQ mixer; a second up-conversion IQ mixer; a first down-conversion IQ mixer with an input to receive an output of the second up-conversion IQ mixer; a second down-conversion IQ mixer with an input to receive an output of the first up-conversion IQ mixer; a first local oscillator to generate a first IQ LO signal coupled to the first up-conversion IQ mixer and the first down-conversion IQ mixer; and a second local oscillator to generate a second IQ LO signal coupled to the second up-conversion IQ mixer and the second down-conversion IQ mixer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification