A C-band wideband and high speed frequency hopping source with low noise is presented. In order to improve the phase noise performance, the source contains single Phase Locked Loop(PLL) and down conversion circuit. The high frequency output moves to low frequency, which makes the working frequency of N divider reduced greatly, meanwhile the maximum output frequency of the frequency synthesizer is improved, and the frequency outputs at the same interval. This solves the contradiction of high frequency and low frequency interval, and realizes the output with low phase noise. The tests show that the phase noise is -123 dBc/Hz@10 kHz under output frequency of 4 460 MHz. The design uses controlled low dropout linear regulator as power supply for HMC704LP4 to avoid error mode selection. It effectively solve the unlock problem when powering up HMC704LP4 caused by error mode selection.