An I/Q imbalance calibration method includes sequentially inputting a first in-phase and quadrature signals calibration signal to a front-end circuit of the transmitter system to acquire and estimate a first and second calibration signal strengths sequentially, wherein a delta estimation is adopted; calculating an I/Q gain imbalance according to estimated first and second calibration signal strengths; sequentially inputting a second in-phase calibration signal and both of the second in-phase and quadrature calibration signal to the front-end circuit of the transmitter system to acquire and estimate a third and fourth calibration signal strengths sequentially, wherein an I/Q gain imbalance compensation is formed on the first in-phase and quadrature calibration signals to generate the second in-phase and quadrature calibration signals; and calculating an I/Q phase imbalance according to estimated third and fourth calibration signal strengths.

A wireless transceiver system is disclosed. The system includes a narrow band transmitter. The narrow band transmitter includes at least a delta sigma phased locked loop (delta-sigma PLL) circuit and a non-linear low-power amplifier, where an output of the delta-sigma PLL is coupled to an input of the non-linear low-power amplifier. The system further includes a wide band transmitter. The wide band transmitter includes at least a digital to analog converter (DAC), a low pass filter, a local oscillator mixer and a linear high power amplifier, where an output of the DAC is coupled to an input of the low pass filter and an output of the low pass filter is coupled to an input of the local oscillator mixer and wherein an output of the local oscillator mixer is coupled to an input of the linear high power amplifier.

A wireless transceiver system is disclosed. The system includes a narrow band transmitter. The narrow band transmitter includes at least a delta sigma phased locked loop (delta-sigma PLL) circuit and a non-linear low-power amplifier, where an output of the delta-sigma PLL is coupled to an input of the non-linear low-power amplifier. The system further includes a wide band transmitter. The wide band transmitter includes at least a digital to analog converter (DAC), a low pass filter, a local oscillator mixer and a linear high power amplifier, where an output of the DAC is coupled to an input of the low pass filter and an output of the low pass filter is coupled to an input of the local oscillator mixer and wherein an output of the local oscillator mixer is coupled to an input of the linear high power amplifier.

A frequency tripler circuit includes an amplifier to receive a balanced input signal at an input frequency and outputs a balanced signal at a second harmonic of the input frequency. The frequency tripler circuit includes a passive double balanced mixer coupled to an output of the amplifier to receive the balanced signal at the second harmonic and the balanced input signal to generate an output balanced signal having a frequency triple the input frequency.

A frequency tripler circuit includes an amplifier to receive a balanced input signal at an input frequency and outputs a balanced signal at a second harmonic of the input frequency. The frequency tripler circuit includes a passive double balanced mixer coupled to an output of the amplifier to receive the balanced signal at the second harmonic and the balanced input signal to generate an output balanced signal having a frequency triple the input frequency.

A method includes sequentially performing analog frequency conversion operations on a first digital frequency conversion signal and a second digital frequency conversion signal based on local oscillator signals at a same frequency, where the first digital frequency conversion signal corresponds to a first sounding reference signal (SRS) to be transmitted on a first carrier, and the second digital frequency conversion signal corresponds to a second SRS to be transmitted on a second carrier, transmitting the first SRS on the first carrier during a first time period, and transmitting the second SRS on the second carrier during a second time period, where the second time period is later than the first time period.

A method includes sequentially performing analog frequency conversion operations on a first digital frequency conversion signal and a second digital frequency conversion signal based on local oscillator signals at a same frequency, where the first digital frequency conversion signal corresponds to a first sounding reference signal (SRS) to be transmitted on a first carrier, and the second digital frequency conversion signal corresponds to a second SRS to be transmitted on a second carrier, transmitting the first SRS on the first carrier during a first time period, and transmitting the second SRS on the second carrier during a second time period, where the second time period is later than the first time period.

A self-calibrating shared-component dual synthesizer includes, for example, two frequency synthesizers that are adapted to operate (respectively) in transmit (TX) and receive (RX) modes. Each synthesizer can be selectively arranged to vary and optimize the phase noise in accordance with the TX and RX requirements associated with each mode as well as independently optimized for flexible low area floorplan to achieve low power, spectral fidelity and reduced test time, low cost built in self-calibration. The two frequency synthesizers are also adapted to provide a built-in self-test signals used for intermodulation testing and calibration.

A self-calibrating shared-component dual synthesizer includes, for example, two frequency synthesizers that are adapted to operate (respectively) in transmit (TX) and receive (RX) modes. Each synthesizer can be selectively arranged to vary and optimize the phase noise in accordance with the TX and RX requirements associated with each mode as well as independently optimized for flexible low area floorplan to achieve low power, spectral fidelity and reduced test time, low cost built in self-calibration. The two frequency synthesizers are also adapted to provide a built-in self-test signals used for intermodulation testing and calibration.

A method and device for phase-based ranging measurement between a first radio frequency transceiver and a second radio frequency transceiver. The method comprises the steps of: transmitting a radio frequency signal from the first radio frequency transceiver to the second radio frequency transceiver; receiving, on the first radio frequency transceiver, a radio frequency signal transmitted from the second radio frequency transceiver, the frequency being the same as the frequency transmitted from the first radio frequency transceiver; shifting the frequencies of the transmitted and the received radio signals of a transceiver to a same frequency, different from the transmitted and received frequencies, prior to being input to processing modules in the transmitter and receiver signal paths of the transceiver, where the modules in these signal paths are synchronized by sharing same clock domain; after an analogue to digital conversion module, converting the analogue transmitted and received radio frequency signals to digital signals, shifting the frequencies of the digital signals to the same frequency as the frequency of the transducer's transmitted and the received radio frequency signals, and measuring the frequency response between the transmitted and reflected radio frequency signals from the resulting digital signals. The device comprises means for performing said method.