阅读说明：本技术 超宽带细步进频率综合器 (Ultra-wideband fine stepping frequency synthesizer ) 是由 袁宗义 于 2019-12-11 设计创作，主要内容包括：本发明公开了一种超宽带细步进频率综合器,包括功分器、谐波发生器、环外放大器、环外滤波器、可变参考源、锁相环A、锁相环B,锁相环A与锁相环B电路结构相同均依次包括鉴相器、环内滤波器1、频率合成器、混频器、环内放大器、环内滤波器2。本发明的工作带宽为10MHz-15GHz,实现了超宽带的频率合成,并采用全新的锁相环方案,结合功分器和谐波发生器设计了两个电路结构相同的锁相环,首先利用锁相环B的窄带滤波特性,将谐波发生器产生的梳状谱信号转换成为步进为100MHz的跳频信号,再将锁相环B内插到锁相环A,实现了低相位噪声的超宽带细步进信号输出；在10MHz-15GHz超宽带的基础上,相位噪声优于-115dBc/Hz@10kHz,相对于现有的超宽带频率综合器提高了技术指标。(The invention discloses an ultra-wideband fine stepping frequency synthesizer, which comprises a power divider, a harmonic generator, an out-of-loop amplifier, an out-of-loop filter, a variable reference source, a phase-locked loop A and a phase-locked loop B, wherein the phase-locked loop A and the phase-locked loop B have the same circuit structure and sequentially comprise a phase discriminator, an in-loop filter 1, a frequency synthesizer, a mixer, an in-loop amplifier and an in-loop filter 2.)

The ultra-wideband fine step frequency synthesizer is characterized by comprising a power divider, a harmonic generator, an out-of-loop amplifier, an out-of-loop filter, a variable reference source, a phase-locked loop A and a phase-locked loop B, wherein the phase-locked loop A and the phase-locked loop B have the same circuit structure and sequentially comprise a phase discriminator, an in-loop filter 1, a frequency synthesizer, a mixer, an in-loop amplifier and an in-loop filter 2;

the power divider is branch three power dividers, the output end of the power divider is connected with the input end of the variable reference source, the second output end of the power divider is connected with the phase discriminator of the phase-locked loop B, the third output end of the power divider is connected with the input end of the harmonic generator, the output end of the variable reference source is connected with the phase discriminator of the phase-locked loop A, the output end of the harmonic generator is connected with the frequency mixer of the phase-locked loop B, the output port of the frequency synthesizer of the phase-locked loop B is connected with the frequency mixer of the phase-locked loop A through an external-loop amplifier and an external-loop filter which are connected in sequence, the harmonic generator generates a comb spectrum signal of 100MHz multiplied by N, the output end of the frequency synthesizer of the phase-locked loop B outputs a frequency hopping local oscillation signal of which is 100MHz in minimum stepping, and the output end of the frequency synthesizer of the phase-locked loop A.

2. The frequency synthesizer of claim 1, wherein: the frequency synthesizer is of the type LMX 2594.

3. Frequency synthesizer according to claim 1 or 2, characterized in that: n is a natural number and the value range of N is more than or equal to 1 and less than or equal to 60.

4. The frequency synthesizer of claim 2, wherein the output of the frequency synthesizer of the phase locked loop B outputs a frequency-hopping local oscillator signal of 7.5GHz-15GHz stepped by 100 MHz.

Technical Field

The invention relates to a signal frequency synthesis technology in wireless communication, in particular to an ultra wide band fine step frequency synthesizer.

Background

The frequency synthesizer is which is a core component of a wireless transmission system, and as wireless communication is continuously developed, frequency synthesizers have been developed more and more, and various types of frequency synthesizers have been formed, including phase-locked fractional frequency synthesizers, direct digital frequency synthesizers, hybrid frequency synthesizers, and the like.

The existing ultra-wideband frequency synthesizer can reach the bandwidth of 10GHz, has very wide bandwidth, and can be applied to various communication fields in , although the existing ultra-wideband frequency synthesizer has very wide bandwidth, the key technical indexes of the existing ultra-wideband frequency synthesizer are relatively common, for example, the phase noise of the frequency synthesizer with the bandwidth of more than 10GHz on the market is only superior to-105 dBc/Hz @10kHz, and the application range of the existing ultra-wideband frequency synthesizer is limited by the relatively common technical indexes.

Disclosure of Invention

The invention aims to solve the problems and provide ultra-wideband fine stepping frequency synthesizers.

The invention realizes the purpose through the following technical scheme:

ultra wide band fine step frequency synthesizer, which comprises a power divider, a harmonic generator, an out-loop amplifier, an out-loop filter, a variable reference source, a phase-locked loop A and a phase-locked loop B, wherein the phase-locked loop A and the phase-locked loop B have the same circuit structure and sequentially comprise a phase discriminator, an in-loop filter 1, a frequency synthesizer, a frequency mixer, an in-loop amplifier and an in-loop filter 2,

the power divider is branch three power dividers, the output end of the power divider is connected with the input end of the variable reference source, the second output end of the power divider is connected with the phase discriminator of the phase-locked loop B, the third output end of the power divider is connected with the input end of the harmonic generator, the output end of the variable reference source is connected with the phase discriminator of the phase-locked loop A, the output end of the harmonic generator is connected with the frequency mixer of the phase-locked loop B, the output port of the frequency synthesizer of the phase-locked loop B is connected with the frequency mixer of the phase-locked loop A through an external-loop amplifier and an external-loop filter which are connected in sequence, the harmonic generator generates a comb spectrum signal of 100MHz multiplied by N, the output end of the frequency synthesizer of the phase-locked loop B outputs a frequency hopping signal of the minimum stepping 100MHz, and the output end of the frequency synthesizer of the phase-locked loop A is the output.

Preferably, the model of the frequency synthesizer is LMX2594, and the th output end of the frequency synthesizer of the phase-locked loop B outputs a frequency-hopping local oscillator signal with the frequency of 7.5GHz-15GHz and the step of 100 MHz.

In particular, N is a natural number and the value range of N is more than or equal to 1 and less than or equal to 60.

The invention has the beneficial effects that:

1. the working bandwidth of the invention is 10MHz-15GHz, which realizes the frequency synthesis of ultra wide band;

2. the invention adopts a brand-new phase-locked loop scheme, designs two phase-locked loops with the same circuit structure by combining a power divider and a harmonic generator, firstly converts a comb spectrum signal generated by the harmonic generator into a frequency hopping signal with the step of 100MHz by utilizing the narrow-band filtering characteristic of the phase-locked loop B, and then interpolates the phase-locked loop B into the phase-locked loop A, thereby realizing the output of an ultra-wideband low-phase noise signal with any step;

3. on the basis of the 10MHz-15GHz ultra-wideband, the achieved clutter suppression is more than or equal to 65dBc, the phase noise is better than-115 dBc/Hz @10kHz, and the technical index is improved compared with the existing ultra-wideband frequency synthesizer.

Drawings

Fig. 1 is a block diagram of the circuit structure of the present invention.

Example 1

As shown in fig. 1, ultra-wideband fine step-by-step frequency synthesizers include a power divider, a harmonic generator, an out-of-loop amplifier, an out-of-loop filter, a variable reference source, a phase-locked loop a, and a phase-locked loop B, where the phase-locked loop a and the phase-locked loop B have the same circuit structure and sequentially include a phase discriminator, an in-loop filter 1, a frequency synthesizer, a mixer, an in-loop amplifier, and an in-loop filter 2.

The power divider is an -division three-power divider, the output end of the power divider is connected with the input end of a variable reference source, the second output end of the power divider is connected with the phase discriminator of a phase-locked loop B, the third output end of the power divider is connected with the input end of a harmonic generator, the output end of the variable reference source is connected with the phase discriminator of the phase-locked loop A, the output end of the harmonic generator is connected with the mixer of the phase-locked loop B, the output end of a frequency synthesizer of the phase-locked loop B is connected with the mixer of the phase-locked loop A through an external-loop amplifier and an external-loop filter which are sequentially connected, the harmonic generator generates a comb spectrum signal of 100MHz multiplied by N, the output end of the frequency synthesizer of the phase-locked loop B outputs a frequency hopping signal with the minimum step of 100MHz, and the .