TRANSCEIVERS HAVING LOOPBACK SWITCHES AND METHODS OF CALIBRATING CARRIER LEAKAGE THEREOF
First Claim
1. A transceiver comprising:
- a transmitter circuit configured to, in a normal mode, up-convert a transmission digital signal to generate a first transmission signal, the transmitter circuit being further configured to, in a calibration mode, perform a digital-to-analog conversion (DAC) operation on a calibration code without the transmission digital signal to generate a calibration signal, change a bias of a mixer in response to the calibration signal, and output a carrier signal of an oscillator as a second transmission signal;
a receiver circuit configured to, in a normal mode, down-convert a receiving signal received from an antenna to generate a first receiving digital signal, the receiver circuit being further configured to, in the calibration mode, down-convert the second transmission signal to generate a second receiving digital signal; and
a loopback switch configured to electrically connect an output terminal of the transmitter circuit with an input terminal of the receiver circuit in the calibration mode.
1 Assignment
0 Petitions
Accused Products
Abstract
A transceiver includes a transmitter circuit, a receiver circuit, and the loopback switch. The transmitter circuit performs a digital-to-analog conversion (DAC) operation on a calibration code without a transmission digital signal in a calibration mode to generate a calibration signal. The transmitter circuit up-converts the calibration signal and generates a transmission signal. The receiver circuit down-converts the transmission signal in the calibration mode and generates a receiving digital signal. The loopback switch electrically connects an output terminal of the transmitter circuit and an input terminal of the receiver circuit in the calibration mode. Thus, the transceiver may stably reduce a carrier leakage irrespective of processes, voltages, and temperatures.
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Citations
20 Claims
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1. A transceiver comprising:
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a transmitter circuit configured to, in a normal mode, up-convert a transmission digital signal to generate a first transmission signal, the transmitter circuit being further configured to, in a calibration mode, perform a digital-to-analog conversion (DAC) operation on a calibration code without the transmission digital signal to generate a calibration signal, change a bias of a mixer in response to the calibration signal, and output a carrier signal of an oscillator as a second transmission signal; a receiver circuit configured to, in a normal mode, down-convert a receiving signal received from an antenna to generate a first receiving digital signal, the receiver circuit being further configured to, in the calibration mode, down-convert the second transmission signal to generate a second receiving digital signal; and a loopback switch configured to electrically connect an output terminal of the transmitter circuit with an input terminal of the receiver circuit in the calibration mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14-15. -15. (canceled)
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16. A transceiver comprising:
a transceiver circuit configured to output a carrier signal as a transmission signal, and to control leakage of a carrier signal based on a calibration signal, the calibration signal being generated based on based on a calibration code, the calibration code being indicative of a direct-current (DC) offset between paths of the transmission signal received at the transceiver circuit. - View Dependent Claims (17, 18, 19, 20)
Specification