By moving the linear spectrum principle, we proposed a 100~1 000 MHz sweep source circuit design. Quadrature signal with the quadrature local oscillator signal of the program orthogonal single sideband modulation method based on the DDS chip are generated by multiplying the sum output signal and local oscillator signal one sideband is suppressed, another sideband signal is the signal obtained by direct conversion will be retained. Study tests show unwanted sideband and the carrier signal of the circuit were inhibited by about -40 dBm, and the circuit also has a higher frequency accuracy and frequency range, not only retains the DDS frequency resolution and excellent frequency agility features but also achieved a wide band sweep function.