Patent ID: 8140039

Claim:
A quadrature-input quadrature-output divider, comprising: an in-phase input configured to receive an in-phase input signal; a quadrature-phase input configured to receive a quadrature-phase input signal; an in-phase output configured to output an in-phase signal; a quadrature-phase output configured to output a quadrature-phase signal; and first, second, third, and fourth analog mixers, each comprising first and second inputs and an output, wherein: the first input of the first analog mixer is configured to receive the in-phase input signal; the first input of the second analog mixer is configured to receive the in-phase input signal; the first input of the third analog mixer is configured to receive the quadrature-phase input signal; the first input of the fourth analog mixer is configured to receive the quadrature-phase input signal; the output of the first analog mixer is configured to be fed back to the second input of the first analog mixer; the output of the second analog mixer is configured to be fed back to the second input of the second analog mixer; the signal input to one of the first and second inputs of the second analog mixer is configured to be phase shifted by 180 degrees; the output of the third analog mixer is configured to be combined with the output of the first analog mixer; the combined signal from the first and third analog mixers is configured to be directed to the in-phase output of the quadrature-input quadrature-output divider and fed back to the second input of the fourth analog mixer; the output of the fourth analog mixer is configured to be combined with the output of the second analog mixer; and the combined output of the second and fourth analog mixers is configured to be directed to the quadrature-phase output of the quadrature-input quadrature-output divider and fed-back to the second input of the third analog mixer.