The DS-3000 wideband microwave synthesizer is a state-of-the-art multi-loop synthesizer tuning continuously from 100 MHz to 20 GHz in 1 Hz steps. Phase noise and spurious performance is consistent with most demanding test equipment, receiver or carrier transmitter requirements. Tuning is accomplished via 4-wire SPI tuning or USB. The synthesizer includes an internal reference that will auto-lock to an external 10 MHz reference when present. Highlights include full GUI control of all features, including step, sweep, and scan functions; wide temperature range covering -30 to +70ºC; outstanding phase noise (<-115 dBc/Hz @ 10 kHz offset at 20 GHz); tuning speed <200 uSEC; and auto-sensing system clock.