The design of a small volume frequency synthesizer that generates linear frequency modulation signal throughDirect Digital Synthesizer (DDS) is introduced, fixed second local oscillator signal through the Phase-Locking Loop (PLL) andgenerates a local oscillator signal through the phase-locked loop and frequency doubler is produced. At the same time,Field-Programmable Gate Array (FPGA) is used to complete DDS control and communication with the system, and the powercontrol part generates various power sources.