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Low Phase Noise RF Frequency Synthesis Circuit

A low phase noise, RF frequency technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems of large output signal phase noise, large harmonic clutter, complex debugging, etc., to achieve low phase noise, harmonic clutter, etc. The effect of excellent performance and harmonic clutter characteristics

Active Publication Date: 2018-07-17
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phase noise of the circuit output signal of this scheme is relatively large, and the modulator and the first-stage triple frequency are the main components of the phase noise deterioration
The modulator is located in the rear stage of the 10MHz crystal oscillator, which will deteriorate the phase noise level of the frequency multiplier input signal; the first stage of triple frequency multiplication adopts a differential pair transistor structure, and if the noise figure of the transistor is large, additional phase noise will be introduced
In addition, this solution has the disadvantages of large harmonic clutter and complicated debugging.

Method used

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  • Low Phase Noise RF Frequency Synthesis Circuit
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  • Low Phase Noise RF Frequency Synthesis Circuit

Examples

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Embodiment 1

[0031] Such as figure 2 As shown, the low phase noise RF frequency synthesis circuit includes a low phase noise crystal oscillator 1 (10MHz low phase noise crystal oscillator is selected), the low phase noise crystal oscillator 1 is connected to the input terminal of the first-level signal amplifier 2, and the output terminal of the first-level signal amplifier 2 Connect with the input end of one-level SBD frequency tripler 3, the output end of one-level SBD frequency tripler 3 is connected with the input end of secondary signal amplifier 4, the output end of secondary signal amplifier 4 is connected with the first of modulator 5 One input terminal is connected, the second input terminal of modulator 5 is connected to triangular wave, the output terminal of modulator 5 is connected with the input terminal of secondary SBD frequency tripler 6, the output terminal of secondary SBD frequency tripler 6 is connected with three The input terminal of stage signal amplifier 7 is conn...

Embodiment 2

[0052] according to figure 2 It can be seen that the low phase noise RF frequency synthesis circuit includes a low phase noise crystal oscillator 1, a first-level signal amplifier 2, a first-level SBD tripler 3, a second-level signal amplifier 4, a modulator 5, and a second-level SBD tripler connected in sequence 6 and a three-stage signal amplifier 7. The specific parameters are as follows.

[0053] Low phase noise crystal oscillator 1 uses a 10MHz crystal oscillator with a phase noise lower than -150dBc / Hz@100Hz, and the output power is 5-10dBm.

[0054] Such as Figure 5 As shown, in the circuit of the first-stage signal amplifier 2. The bias resistor R1 is 500Ω, the resistor R2 is 10kΩ, and the resistor R3 is 10kΩ. The input coupling capacitor C9 is 200pF, and the output coupling capacitor C10 is 200pF. The inductance L8 of the band-stop network of the launch stage is 100nH, and the inductance C8 is 470pF. The inductance L7 of the collector frequency selection netwo...

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Abstract

The invention discloses a low-phase noise radio frequency synthesis circuit. The circuit includes a low-phase noise crystal oscillator, the low-phase noise crystal oscillator is connected with an input end of a first-stage signal amplifier, the output end of the first-stage signal amplifier is connected with the input end of a first-stage SBD frequency tripler, the output end of the first-stage SBD frequency tripler is connected with the input end of a second-stage signal amplifier, the output end of the second-stage signal amplifier is connected with the first input end of a modulator, triangular waves are accessed to the second input end of the modulator, the output end of the modulator is connected with the input end of a second-stage SBD frequency tripler, and the output end of the second-stage SBD frequency tripler is connected with the input end of a third-stage signal amplifier. The low-phase noise radio frequency synthesis circuit has the advantages that phase noise is low, harmonic and clutter characteristics are excellent, and debugging is easy. By utilization of the circuit, phase noise of a rubidium frequency scale microwave search signal can be remarkably reduced, and limitation of an intermodulation effect on rubidium frequency scale frequency stability is lowered.

Description

technical field [0001] The invention relates to the technical field of rubidium atomic frequency standard frequency synthesis, in particular to a low phase noise radio frequency frequency synthesis circuit, which realizes 9 times frequency multiplication and square wave frequency modulation, and improves the frequency stability index of rubidium atomic frequency standard by utilizing the low phase noise characteristics of the circuit . Background technique [0002] The rubidium atomic frequency standard is a frequency-locked loop using the physical system as a frequency discriminator, which locks the frequency of the 10MHz crystal oscillator to the transition frequency of the rubidium atom, so that the crystal oscillator frequency has the same high stability characteristics as the atomic transition frequency. The rubidium atomic frequency standard uses frequency synthesis technology to convert the 10MHz crystal oscillator signal into a modulated 6.834GHz microwave search sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/18
CPCH03L7/18
Inventor 邱紫敬祁峰明刚钟达梅刚华
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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