Multi-tone Testing of Microwave and Rf Components

Simplest (and most expensive) approach may be to combine the outputs of N number of separate signal generators through an N-way power divider. Digital sources, such as a direct digital synthesizer (DDS), can also be used to generate multiple tones, although at a more limited total bandwidth and with less output power than separate signal generators. Similarly, a vector signal generator, which is typically based on a DDS or arbitrary waveform generator, can also produce outputs with multiple tones.