CN216356678U

CN216356678U - C frequency channel DP181 independent phase-locked loop circuit board structure

Info

Publication number: CN216356678U
Application number: CN202122431124.3U
Authority: CN
Inventors: 郭印; 刘洋
Original assignee: Pauxis Huizhou Electronic Technology Co ltd
Current assignee: Pauxis Huizhou Electronic Technology Co ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-04-19
Anticipated expiration: 2031-10-09

Abstract

The embodiment of the application discloses independent phase-locked loop circuit board structure of C frequency channel DP181, which comprises a substrate, be provided with independent phase-locked loop oscillating circuit and radio frequency amplifier circuit on the base plate, independent phase-locked loop oscillating circuit with the radio frequency amplifier circuit interval sets up, just independent phase-locked loop oscillating circuit with the radio frequency amplifier circuit is connected, the radio frequency amplifier circuit includes one-level amplifier circuit, second grade amplifier circuit and tertiary amplifier circuit, one-level amplifier circuit with the second grade amplifier circuit is connected, second grade amplifier circuit with tertiary amplifier circuit connects. The independent phase-locked loop circuit board structure of C frequency channel DP181 of this application, the circuit is succinct and arrange rationally, and the manual operation process is simple, and the frequency lock is accurate, and processing preparation process is simple, and the cost of labor is low, is fit for batch production.

Description

C frequency channel DP181 independent phase-locked loop circuit board structure

Technical Field

The application relates to the technical field of low-noise frequency-reducing amplifiers, in particular to a circuit board structure of an independent phase-locked loop of a C frequency band DP 181.

Background

Lnb (low noise block down converter) is a low noise block down converter, which is composed of a mixer and a local oscillator. LNBs can be generally divided into C-band LNBs (3.4GHZ-4.2GHZ) and KU-band LNBs (10.7GHZ-12.75 GHZ). The LNB is required to amplify the signals because the satellite total signal is relatively weak before reaching the antenna and the signal loss increases with higher frequency coaxial cable transmissions, without degrading the signal-to-noise ratio too much. The working process of the LNB is to amplify the satellite high-frequency signal, then convert the high-frequency satellite signal to the intermediate frequency of 950MHZ-2150MHZ (the intermediate frequency range is determined according to the type of the LNB) by using the local oscillation circuit and amplify the satellite signal again, so as to be beneficial to the transmission of the coaxial cable and the demodulation and the work of the satellite receiver.

The current common circuit board structure for the LNB has the disadvantages of complex circuit arrangement, complex processing and manufacturing procedures, high labor cost and unsuitability for batch production.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a circuit board structure of an independent phase-locked loop of a C frequency band DP181, which simplifies circuit arrangement and processing and manufacturing procedures.

For realizing above-mentioned purpose, the application provides a C frequency channel DP181 independent phase-locked loop circuit board structure, which comprises a substrate, be provided with independent phase-locked loop oscillating circuit and radio frequency amplifier circuit on the base plate, independent phase-locked loop oscillating circuit with the radio frequency amplifier circuit interval sets up, just independent phase-locked loop oscillating circuit with the radio frequency amplifier circuit is connected, the radio frequency amplifier circuit includes one-level amplifier circuit, second grade amplifier circuit and tertiary amplifier circuit, one-level amplifier circuit with the second grade amplifier circuit is connected, second grade amplifier circuit with tertiary amplifier circuit connects.

Preferably, an output end is arranged on the substrate, and the output end is connected with the independent phase-locked loop oscillating circuit.

Preferably, the substrate is provided with an access hole, and the access hole is used for accessing an external signal to the radio frequency amplification circuit.

Preferably, the independent phase-locked loop oscillator circuit includes an independent phase-locked loop oscillator and a passive mixer, and the independent phase-locked loop oscillator is connected to the passive mixer.

Preferably, a three-stage comb-shaped band-pass filter is arranged on the substrate, and the three-stage comb-shaped band-pass filter is respectively connected between the second-stage amplifying circuit and the third-stage amplifying circuit, between the third-stage amplifying circuit and the passive mixer, and between the passive mixer and the independent phase-locked loop oscillator.

Preferably, the bandwidth of the comb-shaped band-pass filter is 3.7GHz-4.2 GHz.

Has the advantages that:

when the signal is accessed to the radio frequency amplification circuit, the signal passes through the first-stage amplification circuit, the second-stage amplification circuit and the third-stage amplification circuit, the gain of the radio frequency signal is better improved, the signal to noise ratio can be better improved, the circuit signal is stable, the signal quality is higher, and the local oscillation signal is more stable after the signal transmitted from the radio frequency amplification circuit passes through the independent phase-locked loop oscillation circuit. The independent phase-locked loop circuit board structure of C frequency channel DP181 of this application, the circuit is succinct, arrange rationally, and product stability and reliability are high, and carry out the mode of mixing outside the circuit board through adopting oscillating signal and radio frequency signal for local oscillator signal is more stable, and the SNR is higher. The circuit of this application is succinct and arrange rationally, and the manual operation process is simpler, and the frequency lock is accurate, and processing preparation process is simple, and the cost of labor is low, is fit for batch production.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic diagram of an overall structure of a C-band DP181 independent pll circuit board structure in embodiment 1 of the present application;

fig. 2 is a circuit connection diagram of a circuit board structure of an independent phase-locked loop of the C-band DP181 in embodiment 1 of the present application;

fig. 3 is a circuit connection diagram of a circuit board structure of an independent phase-locked loop of the C-band DP181 in embodiment 2 of the present application.

Reference numerals: 100. an independent phase-locked loop oscillating circuit; 110. a passive mixer; 120. an independent phase-locked loop oscillator; 210. a first-stage amplifying circuit; 220. a secondary amplifying circuit; 230. a third-stage amplifying circuit; 300. an output end; 400. an access hole; 500. a comb-shaped band-pass filter;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 and fig. 2, the C-band DP181 independent pll circuit board structure includes: the radio frequency amplifying circuit comprises a first-stage amplifying circuit 210, a second-stage amplifying circuit 220 and a third-stage amplifying circuit 230, wherein the first-stage amplifying circuit 210 is connected with the second-stage amplifying circuit 220, and the second-stage amplifying circuit 220 is connected with the third-stage amplifying circuit 230. The first-stage amplification circuit 210, the second-stage amplification circuit 220, and the third-stage amplification circuit 230 constitute an amplification circuit of a bottom noise FET. Therefore, when a signal is accessed to the radio frequency amplifying circuit, the signal passes through the first-stage amplifying circuit 210, the second-stage amplifying circuit 220 and the third-stage amplifying circuit 230, so that the gain of the radio frequency signal is better improved, the signal to noise ratio can be better improved, the signal quality of the circuit signal is higher, and after the signal transmitted from the radio frequency amplifying circuit is mixed by the independent phase-locked loop oscillating circuit 100, the local oscillation signal is more stable. Therefore, the circuit board structure of the C frequency band DP181 independent phase-locked loop is simple and reasonable in arrangement, high in product stability and reliability, and the local oscillator signal is more stable and the signal-to-noise ratio is higher by adopting the mode that the independent phase-locked loop vibrates the signal and the radio frequency signal are mixed outside. It is worth mentioning that, because the circuit is succinct and arrange rationally, therefore the manual operation process is simpler, and the frequency lock is accurate, and the manufacturing process is simple, and the cost of labor is low, is fit for batch production.

In one embodiment, an output terminal 300 is further disposed on the substrate, and the output terminal 300 is connected to the independent pll oscillator circuit 100. The substrate is further provided with an access hole 400, and the access hole 400 is used for accessing an external signal to the radio frequency amplification circuit. After the signal is accessed from the access hole 400, the signal passes through the radio frequency amplifying circuit and then the independent phase-locked loop oscillating circuit 100, and finally the signal is stably output from the output end 300.

In one embodiment, the independent pll oscillator circuit 100 comprises an independent pll oscillator 120 and a passive mixer 110, the independent pll oscillator 120 coupled to the passive mixer 110. That is to say, when the signal passes through the passive mixer 110, the independent pll oscillator 120 performs fm control on the signal passing through the passive mixer 110, so that the whole signal can be in a stable state after passing through the passive mixer 110, that is, after passing through the whole independent pll oscillator circuit 100, the output local oscillator signal is more stable.

Further, a three-stage comb filter 500 is further disposed on the substrate, the comb filter 500 is respectively connected to the three-stage amplifying circuit 230 and the independent pll oscillator 100, and specifically, the three-stage comb bandpass filter 500 is respectively connected between the two-stage amplifying circuit 220 and the three-stage amplifying circuit 230, between the three-stage amplifying circuit 230 and the passive mixer 110, and between the passive mixer 110 and the independent pll oscillator 120. In this embodiment, after the signal passes through the first-stage amplifying circuit 210, the second-stage amplifying circuit 220 and the third-stage amplifying circuit 230, the gain of the rf signal is better increased. The signal-to-noise ratio is better improved, the stable signal quality of the circuit signal is higher, and the signal transmitted from the radio frequency amplifying circuit passes through the comb filter 500, is filtered through the comb filter 500, and is then output after passing through the independent phase-locked loop oscillating circuit 100, so that the local oscillation signal is more stable.

Therefore, through adopting novel circuit design thinking, replaced traditional circuit layout for the stability and the reliability of product are higher, use this C frequency channel DP181 independent phase-locked loop circuit board structure local oscillator signal more stable than traditional PCB board, improved the SNR well. And because the circuit of this independent phase-locked loop circuit board structure of C frequency channel DP181 is simple and arrange rationally, the operation of being convenient for, holistic operating procedure is simple, and the frequency phase-locking is accurate. As is well known, the stability of the local oscillation frequency in the whole receiving system is very important, and parameters such as frequency error and phase noise are very important for the demodulation of signals. The circuit board structure adopts the mode that the radio frequency signal and the local oscillation signal are mixed outside, the stability of the local oscillation frequency is well solved, and the using quantity of elements is obviously saved.

Example 2

Referring to fig. 3, the C-band DP181 independent phase-locked loop circuit board structure further includes an intermediate frequency circuit, and the C-band DP181 independent phase-locked loop circuit board structure adopts the steps of adding a comb filter notch on a radio frequency amplification circuit, adding a multilayer ceramic filter on the intermediate frequency circuit, then adding a multi-channel LC filter, thereby solving the problem of interference signals from a 5G mobile phone base station, and the frequency of the interference signals from the 5G mobile phone base station is 3.4GHZ-3.6 GHZ. The working input frequency of the product is 3.7GHZ-4.2GHZ, and the frequency of the intermediate frequency output is 950MHZ-1450 MHZ. The comb filter BPF of the radio frequency amplifying circuit filters 3.4GHZ-3.6 GHZ-35 DB, and the ceramic filter and the LC filter circuit of the intermediate frequency circuit filter intermediate frequency signals-15 DB. Therefore, the system can be well used in the environment of the 5G base station, and the problem that the traditional product cannot be used in the environment with the 5G base station is well avoided. That is, the frequency of the signal received by the circuit board structure of the C-band DP181 independent pll is relatively close to the frequency transmitted by the 5G cellular phone base station, which may cause mutual interference. And 5G base station signals are filtered through the circuit. Therefore, in the receiving process, the interference of signals of the 5G mobile phone base station is avoided, the whole receiving is more stable, the operation and the work can be still normal under the environment of the 5G mobile phone base station, and the problem that the whole C-frequency-band DP181 independent phase-locked loop circuit board structure can stably work under different environments is well solved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims

1. The utility model provides a C frequency channel DP181 independent phase-locked loop circuit board structure, includes the base plate, its characterized in that: be provided with independent phase-locked loop oscillating circuit (100) and radio frequency amplifier circuit on the base plate, independent phase-locked loop oscillating circuit (100) with the radio frequency amplifier circuit interval sets up, just independent phase-locked loop oscillating circuit (100) with the radio frequency amplifier circuit is connected, the radio frequency amplifier circuit includes one-level amplifier circuit (210), second grade amplifier circuit (220) and tertiary amplifier circuit (230), one-level amplifier circuit (210) with second grade amplifier circuit (220) are connected, second grade amplifier circuit (220) with tertiary amplifier circuit (230) are connected.

2. The C-band DP181 independent pll circuit board structure of claim 1, wherein: an output end (300) is arranged on the substrate, and the output end (300) is connected with the independent phase-locked loop oscillating circuit (100).

3. The C-band DP181 independent pll circuit board structure of claim 2, wherein: an access hole (400) is formed in the substrate, and the access hole (400) is used for accessing an external signal to the radio frequency amplification circuit.

4. The C-band DP181 independent pll circuit board structure of claim 1, wherein: the independent phase-locked loop oscillating circuit (100) comprises an independent phase-locked loop oscillator (120) and a passive frequency mixer (110), wherein the independent phase-locked loop oscillator (120) is connected with the passive frequency mixer (110).

5. The C-band DP181 independent PLL circuit board structure of claim 4, wherein: be provided with tertiary comb band pass filter (500) on the base plate, the tertiary comb band pass filter (500) connect respectively in second grade amplifier circuit (220) with between tertiary amplifier circuit (230), tertiary amplifier circuit (230) with between passive mixer (110), passive mixer (110) with between independent phase-locked loop oscillator (120).

6. The C-band DP181 independent PLL circuit board structure of claim 5, wherein: the bandwidth of the comb-shaped band-pass filter (500) is 3.7GHZ-4.2 GHZ.