The SSG-4000HP from Mini Circuits is a Signal Generator with Frequency 250 MHz to 4 GHz, Resolution 5 KHz, Output Power -50 to 21.5 dBm, Phase Noise -147 to -69 dBc/Hz, Frequency Setting time 2.5 msec. Tags: Analog Signal Generator. More details for SSG-4000HP can be seen below.