DC offset calibration in an interdependent quadrature receiver

A method comprising:

• initiating a DC offset calibration for a quadrature differential amplifier having a first channel and a second channel, the first channel and the second channel having DC offset interdependency;
• iteratively, until a convergence is detected, calibrating at least one of:
• the second channel to determine a DC offset setting for the second channel while a DC offset setting for the first channel is held;
• and
• the first channel to determine the DC offset setting for the first channel while the DC offset setting for the second channel is held;
• storing a converged DC offset setting for the first channel in a first storage;
• storing a converged DC offset setting for the second channel in a second storage;
• and
• providing the converged DC offset setting for the first channel and the converged DC offset setting for the second channel to the quadrature differential amplifier to provide DC offset compensation.

A system comprising:

• an antenna to receive a radio frequency (RF) signal;
• a low noise amplifier (LNA) coupled to the antenna to amplify the RF signal;
• a mixer coupled to the LNA to down convert the RF signal to a second frequency signal;
• a quadrature differential amplifier to amplify the second frequency signal and output a quadrature differential signal, the quadrature differential amplifier having an in-phase (I)-channel having an I-channel DC offset and a quadrature-phase (Q)-channel having a Q-channel DC offset, wherein the I-channel and the Q-channel have DC offset interdependency;
• a DC offset calibration circuit coupled to the quadrature differential amplifier, the DC offset calibration circuit to independently determine, based at least in part on a seed value for at least one of the I-channel or the Q-channel, an I-channel DC offset setting and a Q-channel DC offset setting, to compensate for the I-channel DC offset and the Q-channel DC offset, wherein the DC offset calibration circuit is to:
• calibrate the I-channel to determine the I-channel DC offset setting while the seed value for the Q-channel is held;
• and
• calibrate the Q-channel to determine the Q-channel DC offset setting while the I-channel DC offset setting is held;
• a peak detector coupled to the quadrature differential amplifier to detect a peak signal from the quadrature differential signal;
• and
• a non-volatile memory to store the seed value for the at least one of the I-channel or the Q-channel.