A quadrature subharmonic mixer comprises a polyphase filter configured to
generate quadrature components of a local oscillator (LO) reference
signal, a summing and scaling element configured to create additional
components of the LO reference signal, and a plurality of mixer elements
configured to multiply the quadrature components of the LO reference
signal and the additional components of the LO reference signal with a
radio frequency (RF) signal to obtain a downconverted version of the RF
signal.