Ultra-wideband signal generator with low phase noise

A waveform generator, comprising:

• a carrier band generator configured to produce a carrier signal;
• one or more selectable frequency multipliers to receive the carrier signal and to output a selected carrier signal having a frequency of a multiple of the carrier signal;
• at least two main digital-to-analog converters (DACs), each main DAC to receive one of a digital in-phase (I) signal and a digital quadrature (Q) signal and to convert the digital I signal and digital Q signal to a first analog I signal and a first analog Q signal in accordance with a control signal;
• at least two offset DACs, each offset DAC to receive one of the digital I signal and the digital Q signal to convert the digital I signal and the digital Q signal to a second analog I signal and a second analog Q signal in accordance with the control signal;
• a mixer to mix the first analog I signal, the second analog I signal, the first analog Q signal, and the second analog Q signal with the selected carrier signal to produce an output signal;
• and
• a variable filter configured to receive the output signal and produce a filtered output signal.