Spur compensation method and system

A method for calibration of a transceiver (TRX) comprising a transmitter (TX) and a measurement receiver (MRX), the method comprising:

• producing a plurality of TX local oscillator (LO) signals by a first LO generator comprising a first frequency doubler and a first frequency divider, the first frequency doubler being configured to receive a voltage controlled oscillator (VCO) signal having a first frequency and generate a first signal fed into the first frequency divider, the first signal having a second frequency that is twice the first frequency;
• producing a plurality of MRX LO signals by a second LO generator comprising a second frequency doubler and a second frequency divider, the second frequency doubler being configured to receive the VCO signal and generate a second signal fed into the second frequency divider, the second signal having the second frequency;
• in a calibration mode, configuring the TX and the MRX to operate at a same LO frequency;
• producing measurement signals including a second order counter-intermodulation (CIM2) signal caused by asymmetry of the first frequency doubler;
• and
• generating a symmetry adjustment code based on the measurement signals;
• and
• adjusting symmetry of the first frequency doubler based on the symmetry adjustment code.

A system comprising a transmitter (TX) and a measurement receiver (MRX), the system comprising:

• a first local oscillator (LO) generator comprising a first frequency doubler and a first frequency divider, the first frequency doubler being configured to receive a voltage controlled oscillator (VCO) signal having a first frequency and generate a first signal fed into the first frequency divider, the first signal having a second frequency that is twice the first frequency, wherein the first frequency divider is configured to generate a plurality of TX LO signals;
• a second LO generator comprising a second frequency doubler and a second frequency divider, the second frequency doubler being configured to receive the VCO signal and generate a second signal fed into the second frequency divider, the second signal having the second frequency, wherein the second frequency divider is configured to generate a plurality of MRX LO signals;
• the TX configured to convert digital in-phase and quadrature-phase signals to a plurality of phase signals, and generate an analog TX output signal based on the plurality of phase signals and the plurality of TX LO signals;
• and
• the MRX configured to receive the analog TX output signal and generate measurement signals including distortion signals.

A method for calibration of a transceiver (TRX) comprising a transmitter (TX) and a measurement receiver (MRX), the method comprising:

• receiving a first signal generated by a voltage controlled oscillator (VCO) having a first frequency;
• in a first mode of operation:
• producing a first TX signal having a second frequency that is a double of the first frequency;
• producing a second TX signal having a third frequency that is one third of the second frequency;
• producing a first MX signal having the second frequency;
• producing a second MX signal having the third frequency;
• and
• transmitting outgoing RF signals using the second TX signal having the third frequency;
• and
• in a second mode of operation:
• producing a third MX signal having a fourth frequency that is one half of the third frequency;
• transmitting outgoing RF signals using the second TX signal having the third frequency;
• and
• processing MRX signals in the MRX receiver using the third MX signal having the fourth frequency.