Method and apparatus are provided for linearized balanced signal mixing. A
signal mixing circuit (10) for translating a radio frequency (RF) signal
is provided comprising an input amplifier (12), a mixer network (14), and
an output buffer amplifier (18). The input amplifier (12) is configured
to produce an amplified RF signal and cancel an input third-order
intermodulation (IM3) distortion in the amplified RF signal with a
cross-coupled feedback amplifier (13). The mixer network (14) is
configured to produce an intermediate frequency (IF) signal based on the
amplified RF signal and a local oscillator signal. The output amplifier
(18) is configured to buffer the IF signal and cancel an output IM3
distortion in the IF signal with a cross-coupled feedback amplifier (19).
The input amplifier (12) and cross-coupled feedback amplifier (13) also
serve as a bias current source for the mixer network (14), thus lowering
the supply voltage required for the mixing circuit (10).