Embodiments of the present invention include methods for wide bandwidth synthesizer circuits and methods. In one embodiment, the present invention includes a frequency synthesizer comprising a multiplexer and a band group selector. The multiplexer is coupled to receive a plurality of sinusoidal signals. Each sinusoidal signal has a unique frequency. The band group selector selects between a plurality of band groups. The band group selector is coupled to receive a first signal from the multiplexer. The multiplexer multiplexes between the plurality of sinusoidal signals and provides the first signal. The band group selector includes a band mixer. The band mixer mixes the first signal with a band signal having a band frequency. The band signal corresponds to a band group selected from the plurality of band groups. The band group selector provides a transmitter mixer signal and a receiver mixer signal.