High-frequency narrow-band synthesis source circuit and method with ultra-low phase noise and ultra-high frequency resolution

An ultra-high frequency and resolution technology, applied in the field of high-frequency narrow-band synthesis source circuit, can solve the problems of high spurious index of output signal, affecting the performance of high-frequency output signal spectrum, and inability to obtain ultra-high frequency resolution, etc., to achieve saving Circuit cost and high versatility

Inactive Publication Date: 2019-02-05
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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AI Technical Summary

Problems solved by technology

[0007] First: Using integer frequency multiplication plus DDS direct digital synthesis technology mixing scheme, the output signal spurious index is too high, which seriously affects the high frequency output signal spectrum performance
[0008] Second: Using a single-loop phase-locked scheme, the ultra-high frequency resolution of 0.1mHz cannot be obtained
[0009] Third: Both solutions cannot obtain good phase noise indicators near the end (within the loop bandwidth)

Method used

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  • High-frequency narrow-band synthesis source circuit and method with ultra-low phase noise and ultra-high frequency resolution
  • High-frequency narrow-band synthesis source circuit and method with ultra-low phase noise and ultra-high frequency resolution

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] A high-frequency narrow-band synthesis source circuit with ultra-low phase noise and ultra-high frequency resolution, such as figure 1 As shown, including: phase-locked loop reference signal generation circuit, N 2 Sub-integer multiple point frequency generation circuit 10, frequency mixing feedback phase detection loop;

[0034] PLL reference signal generation circuit and N 2 The sub-integer multiple point frequency generation circuit 10 is connected with the frequency mixing feedback phase detection loop respectively;

[0035] The phase-locked loop reference signal generating circuit is used to generate a high-frequency resolution phase-locked loop reference signal, N 2 The sub-integer multiple point frequency generation circuit 10 is used to generate the N of the 100MHz reference signal 2 Sub-integer multiple point frequency signal;

[00...

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Abstract

The invention discloses a high-frequency narrow-band synthesis source circuit and method with ultra-low phase noise and ultra-high frequency resolution. The phase detection loop is connected; the phase-locked loop reference signal generation circuit is used to generate the phase-locked loop reference signal with high frequency resolution, and the N2 times integer multiple point frequency generation circuit is used to generate the N2 times integer multiple point frequency signal of the reference signal ; The phase error generated by the phase detector is converted into a voltage signal to adjust the voltage-controlled oscillator until the loop is locked. Beneficial effects of the present invention: the high-frequency narrow-band synthetic source of the present invention can obtain any synthetic source with a frequency ≥ 1 GHz and a bandwidth of 100 MHz, and the frequency resolution can reach 0.1 mHz, and an ultra-low phase noise index can be obtained, taking into account far and near end noise.

Description

technical field [0001] The invention relates to the technical field of high-frequency narrow-band synthesis source design, in particular to a high-frequency narrow-band synthesis source circuit and method with ultra-low phase noise and ultra-high frequency resolution. Background technique [0002] In the design of various high-frequency narrow-band synthetic sources at this stage, there are more and more requirements for the bandwidth and frequency band types of the synthetic source. At the same time, the phase noise, frequency resolution, spurious, harmonic, volume and The cost puts forward higher requirements. [0003] In the current design of high-frequency narrow-band synthetic sources, there are mainly two schemes: [0004] The first solution is to select a high-index reference frequency point (usually 100MHz), and obtain the frequency multiplied signal and the signal obtained by DDS direct digital synthesis technology through frequency mixing. The output frequency of...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H03L7/18
CPCH03L7/18H03L2207/12
Inventor王李飞
OwnerTHE 41ST INST OF CHINA ELECTRONICS TECH GRP