CN219627696U

CN219627696U - Small broadband small-step frequency hopping phase-locked source

Info

Publication number: CN219627696U
Application number: CN202320301883.4U
Authority: CN
Inventors: 李军; 李冠钦; 刘敬之
Original assignee: CHENGDU HONGKE MICROWAVE COMMUNICATION CO LTD
Current assignee: CHENGDU HONGKE MICROWAVE COMMUNICATION CO LTD
Priority date: 2023-02-23
Filing date: 2023-02-23
Publication date: 2023-09-01
Anticipated expiration: 2033-02-23

Abstract

The utility model relates to a miniaturized broadband small-step frequency hopping phase-locked source, which comprises a main loop and an auxiliary loop, wherein the auxiliary loop comprises a first phase-locked loop, a first loop filter and a first voltage-controlled oscillator which are sequentially connected, the main loop comprises a second phase-locked loop, a second loop filter, a second voltage-controlled oscillator, a mixer, an amplifier a, an amplifier b and a low-pass filter, the second phase-locked loop, the second loop filter and the second voltage-controlled oscillator are sequentially connected, the input end of the low-pass filter is connected with the mixer, the output end of the low-pass filter is connected with the input end of the amplifier a, the output end of the amplifier a is connected with the second phase-locked loop, the auxiliary end of the second voltage-controlled oscillator is connected with the mixer through the amplifier b, and the output end of the first voltage-controlled oscillator is connected with the mixer. The frequency coverage of the design of the utility model is wider, the frequency hopping step is small, and the influence of fractional stray and integer boundary stray on the local oscillation output signal is effectively restrained; the mutual crosstalk of signals after miniaturization is reduced, and the signal output quality is improved.

Description

Small broadband small-step frequency hopping phase-locked source

Technical Field

The utility model relates to the technical field of broadband frequency hopping frequency synthesis, in particular to a miniaturized broadband small-step frequency hopping phase-locked source.

Background

The frequency source chip is the core equipment of the modern radio communication system, the quality of the output signal directly determines the performance of the system, and low phase noise, low spurious, fast frequency hopping and the like become the necessary demands of the system. The phase-locked loop chip is one of important means for realizing a frequency source, and has the advantages of low phase noise and good spurious suppression characteristic. In the prior art, for example, a direct comprehensive scheme is adopted by Nanjing electronic technology institute, and an S-band high-performance frequency hopping comprehensive is developed successfully. The low-spurious small-step frequency synthesis module designed by the university of electronic technology realizes-95 dBc/Hz@10KHz, the frequency range is 2060-2160MHz, the step is 10KHz, and the harmonic suppression reaches-45 dBc. However, the problems or defects of the two schemes are that the two schemes are S-band frequency hopping frequency synthesis, the frequency hopping bandwidth is small, and the application range is small. While fractional spurs and integer boundary spurs caused by small step frequency hopping can influence local oscillation output signals; secondly, the problem of local oscillation reverse crosstalk and the problem of local oscillation output clutter suppression need to be solved; the mutual crosstalk of signals after miniaturization finally influences the quality of local oscillation output signals.

Disclosure of Invention

Based on this, it is necessary to provide, in view of the above problems

The miniaturized broadband small-step frequency hopping phase-locked source comprises a main loop and an auxiliary loop, wherein the auxiliary loop comprises a first phase-locked loop and a first voltage-controlled oscillator which are sequentially connected, the main loop comprises a second phase-locked loop, a second loop filter, a second voltage-controlled oscillator, a mixer, an amplifier a, an amplifier b and a low-pass filter, the second phase-locked loop, the second loop filter and the second voltage-controlled oscillator are sequentially connected, the input end of the low-pass filter is connected with the mixer, the output end of the second loop filter is connected with the input end of the amplifier a, the output end of the amplifier a is connected with the second phase-locked loop, the auxiliary end of the second voltage-controlled oscillator is connected with the mixer through the amplifier b, and the output end of the first voltage-controlled oscillator is connected with the mixer.

Preferably, the models of the first phase-locked loop and the second phase-locked loop are PE33243 and BM7105, respectively.

Preferably, the model of the amplifier a and the model of the amplifier b are VD70 series.

Preferably, the models of the first voltage-controlled oscillator and the second voltage-controlled oscillator are SIV103.

Preferably, the mixer is model VD7600.

The utility model has the advantages that: the radio frequency circuit is highly integrated, has smaller volume, wider frequency coverage and small frequency hopping steps, and effectively suppresses the influence of fractional stray and integer boundary stray on a local oscillator output signal; the mutual crosstalk of signals after miniaturization is reduced, and the signal output quality is improved.

Drawings

Fig. 1 is a schematic diagram of a miniaturized wideband small-step frequency-hopping phase-locked source circuit according to one embodiment.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the miniaturized broadband small-step frequency hopping phase-locked source comprises a main loop 100 and an auxiliary loop 200, wherein the auxiliary loop 200 comprises a first phase-locked loop, a first loop filter and a first voltage-controlled oscillator which are sequentially connected, the main loop 100 comprises a second phase-locked loop, a second loop filter, a second voltage-controlled oscillator, a mixer, an amplifier a, an amplifier b and a low-pass filter, the second phase-locked loop, the second loop filter and the second voltage-controlled oscillator are sequentially connected, the input end of the low-pass filter is connected with the mixer, the output end of the low-pass filter is connected with the input end of the amplifier a, the output end of the amplifier a is connected with the second phase-locked loop, the auxiliary end of the second voltage-controlled oscillator is connected with the mixer through the amplifier b, and the output end of the first voltage-controlled oscillator is connected with the mixer. Specifically, signals with the frequency of 100MHZ are input to the first phase-locked loop and the second phase-locked loop of the main loop 100 and the auxiliary loop 200, wherein the auxiliary loop 200 adopts integer phase discrimination, the phase discrimination frequency is 50MHZ, the first phase-locked loop and the second phase-locked loop uniformly integrate clock signals with the signals, the signals are output to the first loop filter and the second loop filter for filtering treatment, clutter signals are removed, the signals of the auxiliary loop 200 are processed by the first voltage-controlled oscillator to form 3.2GHz-6.2GHz/STEP50MHZ, the signals are input to the mixer of the main loop 100 and used as local oscillator signals, the final output frequency of the main loop 100 is 3.7 GHz-6.8 GHz, the signals pass through the power divider, the 1 path is used as radio frequency signals of the mixer, the radio frequency signals of the auxiliary loop 200 are mixed to generate 500 MHZ-600 MHZ signals, and the intermediate frequency signals are input into the phase discriminator as feedback signals for phase discrimination. The radio frequency circuit is highly integrated, has smaller volume, wider frequency coverage and small frequency hopping steps, and effectively suppresses the influence of fractional stray and integer boundary stray on a local oscillator output signal; the mutual crosstalk of signals after miniaturization is reduced, and the signal output quality is improved. In the present utility model, the models of the first phase-locked loop and the second phase-locked loop are PE33243 and BM7105, respectively. The model of the amplifier a and the model of the amplifier b are VD70 series. The model of the first voltage-controlled oscillator and the second voltage-controlled oscillator is SIV103. The mixer is model VD7600.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The utility model provides a miniaturized broadband is step-by-step frequency hopping phase-locked source, its characterized in that: the auxiliary loop comprises a first phase-locked loop, a first loop filter and a first voltage-controlled oscillator which are sequentially connected, the main loop comprises a second phase-locked loop, a second loop filter, a second voltage-controlled oscillator, a mixer, an amplifier a, an amplifier b and a low-pass filter, the second phase-locked loop, the second loop filter and the second voltage-controlled oscillator are sequentially connected, the input end of the low-pass filter is connected with the mixer, the output end of the low-pass filter is connected with the input end of the amplifier a, the output end of the amplifier a is connected with the second phase-locked loop, the auxiliary end of the second voltage-controlled oscillator is connected with the mixer through the amplifier b, and the output end of the first voltage-controlled oscillator is connected with the mixer.

2. The miniaturized broadband small step-up frequency hopping phase-locked source of claim 1, wherein: the models of the first phase-locked loop and the second phase-locked loop are PE33243 and BM7105 respectively.

3. The miniaturized broadband small step-up frequency hopping phase-locked source of claim 1, wherein: the model of the amplifier a and the model of the amplifier b are VD70 series.

4. The miniaturized broadband small step-up frequency hopping phase-locked source of claim 1, wherein: the model of the first voltage-controlled oscillator and the second voltage-controlled oscillator is SIV103.

5. The miniaturized broadband small step-up frequency hopping phase-locked source of claim 1, wherein: the mixer is model VD7600.