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a frequency synthesizer

A technology of frequency synthesizer and mixer, applied in the field of spectrum analyzer

Active Publication Date: 2021-11-16
SHENZHEN CITY SIGLENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem mainly solved by the present invention is how to improve the phase noise index of the spectrum analyzer

Method used

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Embodiment 1

[0050] Please refer to figure 1 , is a schematic structural diagram of a frequency synthesizer in an embodiment, and the frequency synthesizer includes a reference signal generating device 1 , a first mixing loop 2 and a second mixing loop 3 . The reference signal generating device 1 includes a first reference signal output terminal and a second reference signal output terminal, the first reference signal output terminal is connected to the first frequency mixing loop 2, and the second reference signal output terminal is connected to the second frequency mixing loop 3 connect. The reference signal generating device 1 is used for sending a first reference signal and a second reference signal to the first mixing loop 2 and the second mixing loop 3 respectively. The first mixing loop 2 includes a comb spectrum signal generator 21, a first mixer 22, a first phase detector 23, a first loop filter 24, a first oscillator 25, a power divider 26, a band A filter circuit 27, an eighth...

Embodiment 2

[0063] Please refer to figure 2 , is a schematic structural diagram of a frequency synthesizer in an embodiment. In an embodiment of the present application, the frequency synthesizer is used to deliver local oscillator scanning signals, including a local oscillator circuit 100 and a mixing loop circuit 200. The mixing loop The circuit 200 includes a first signal generator 210, a third mixer 220, a third phase detector 230, a third loop filter 240, a third oscillator 250, a first power divider 260, a second frequency divider 280 and bandpass filter circuit 270. The third oscillator 250 is used for outputting a low phase noise sweep frequency mixing signal to the first power divider 260 . The first power divider 260 is used for sending the low-phase-noise swept-frequency mixed signal to the local oscillator circuit 100 and the third mixer 220 respectively. The first signal generator 210 is used to generate a preset mixed initial signal, and send the mixed initial signal to t...

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Abstract

A frequency synthesizer includes a reference signal generating device, a first mixing loop and a second mixing loop. The reference signal generating device is used to send the first reference signal and the second reference signal to the first and second frequency mixing loops respectively, and the first and second frequency mixing loops respectively obtain the first and second reference signals according to the first and second reference signals The second scans the mixed signal. Wherein, the first frequency mixing loop includes a comb spectrum signal generator, a first mixer, a first phase detector, a first loop filter, a first oscillator, a power divider, a bandpass filter circuit and eight divider. The second frequency mixing loop is also used to obtain a second frequency scanning and mixing signal according to the second reference signal and the first scanning and mixing signal with low phase noise, and output the second frequency scanning and mixing signal as a local oscillator signal. Since the phase noise of the second scanning mixing signal output by the second mixing loop is reduced by the low phase noise first scanning mixing signal, the phase noise index of the local oscillator signal output by the frequency synthesizer is improved.

Description

technical field [0001] The invention relates to the technical field of spectrum analyzers, in particular to a frequency synthesizer. Background technique [0002] Spectrum analyzer is an instrument for studying the spectrum structure of electrical signals. It is used to measure signal parameters such as signal distortion, modulation degree, spectral purity, frequency stability and intermodulation distortion. It can be used to measure certain components of circuit systems such as amplifiers and filters. Parameter, is a multipurpose electronic measuring instrument. It can also be called frequency domain oscilloscope, tracking oscilloscope, analysis oscilloscope, harmonic analyzer, frequency characteristic analyzer or Fourier analyzer, etc. Modern spectrum analyzers can display analysis results in analog or digital modes, and can analyze electrical signals in all radio frequency bands from very low frequencies below 1 Hz to submillimeter bands. The spectrum analyzer needs to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/18H03L7/085H03L7/185G01R23/16
CPCH03L7/18H03L7/085H03L7/185G01R23/165
Inventor 郑翠翠马兴望
Owner SHENZHEN CITY SIGLENT TECH
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