Transceiver Device
AssigneeSequans Communications
InventorsKuldip Modha, Jackson Harvey, Thomas Winiecki
Life of this patent
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Abstract
A transceiver for RF signals uses receiving circuitry to derive control signals to reduce undesired signal frequencies in the output of the transmitting circuitry.
Claims13
An RF transceiver comprising a transmitter, an antenna and a receiver having receiving circuitry for receiving RF signals from the antenna, the transmitter having first and second analog signal paths for carrying in-phase and quadrature signals and the transmitter being arranged in use to provide RF signals to the antenna, the transceiver having means for coupling RF signals from the transmitter to an RF input of the receiving circuitry and means for causing the receiving circuitry to form signals related to undesired frequencies in the RF signals from the transmitter, the transceiver having processing circuitry adapted to respond to the signals related to the undesired frequencies to control the transmitter to reduce the undesired frequencies.
A method of transmitting RF signals from a transceiver comprising a transmitter, an antenna and a receiver having receiving circuitry for receiving RF signals from the antenna, the method comprising:
- providing respective phase-quadrature signals over first and second analog signal paths, and converting signals from the first and second analog signal paths to RF for the antenna,
- coupling RF signals from the transmitter to an RF input of the receiving circuitry;
- controlling the receiving circuitry to form signals related to undesired frequencies in the RF signals from the transmitter, and
- in response to the signals related to the undesired frequencies, controlling the transmitter to reduce the undesired frequencies.
A method of measuring gain and phase imbalance in the transmitter of a transceiver, which transmitter is configured to mix a baseband signal with a local oscillator frequency, the method comprising providing, as baseband signal, a test tone to the transmitter input, down-converting the transmitter output using the receiver of the transceiver, and evaluating the real and imaginary parts of a down-converted signal corresponding to a transmit image frequency to derive said gain and phase imbalance.
Dependencies are inferred from the claim text.