A complementary low phase noise frequency synthesizer and method of using the same
By designing a frequency synthesizer that includes a frequency multiplier module, an adjustment module, and a low-noise PLL module, and combining multi-stage filtering and power supply isolation, the problem of high near-end noise in the output signal of the frequency synthesizer is solved, achieving low phase noise at both the near and far ends, making it suitable for scenarios such as radar and communication base stations.
CN122247416APending Publication Date: 2026-06-19INNOVATION ACAD FOR PRECISION MEASUREMENT SCI & TECH CAS
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- INNOVATION ACAD FOR PRECISION MEASUREMENT SCI & TECH CAS
- Filing Date
- 2026-05-19
- Publication Date
- 2026-06-19
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Figure CN122247416A_ABST
Abstract
A complementary low-phase-noise frequency synthesizer and its usage method are disclosed. The synthesizer includes a frequency multiplier module, an adjustment module, and a low-noise PLL module. The low-noise PLL module includes a crystal oscillator, a third mixer, a PID circuit, and a third power divider. The adjustment module includes a second mixer and a DDS chip. The frequency multiplier module includes a first power divider. In application, the frequency multiplier module and the adjustment module first output a second phase reference signal. Then, the crystal oscillator, the third mixer, and the PID circuit form a closed-loop lock to achieve selective phase tracking. The loop bandwidth of the PID circuit is then adjusted to output signals with low near-end and low far-end phase noise. The adjustment frequency modulation resolution of the DDS chip meets the requirements of practical use. Therefore, the output signal of this design has low near-end and low far-end phase noise.
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