CN207304490U

CN207304490U - Auxiliary low noise broadband amplifying device is used in one kind test

Info

Publication number: CN207304490U
Application number: CN201721390385.2U
Authority: CN
Inventors: 罗承裕
Original assignee: HUBEI GUANGXING COMMUNICATION TECHNOLOGY Co Ltd
Current assignee: HUBEI GUANGXING COMMUNICATION TECHNOLOGY Co Ltd
Priority date: 2017-10-26
Filing date: 2017-10-26
Publication date: 2018-05-01
Anticipated expiration: 2027-10-26

Abstract

A kind of test auxiliary low noise broadband amplifying device is the utility model is related to, belongs to electronics broad band amplifier technical field.It is made of cavity, circuit board etc., and circuit board is made of amplifying circuit, power circuit, gain control circuit；The N3 amplification module input terminals of amplifying circuit are connected with input port, its output terminal is connected by diode VD1 with delivery outlet, N3 primary amplification module is connected by diode VD2 with N2 amplification module input terminals, and N2 amplification modules output terminal is connected by diode VD3 with delivery outlet；The N1 control chips of gain control circuit produce reverse control signal and control field-effect tube V1, the break-make of field-effect tube V2 respectively, and to control diode VD1 conductings, VD2, VD3 to end, circuit obtains 15dB gains amplification；Conversely, circuit obtains 30dB gains amplification.Simple in structure, working stability is easy to carry, solves the problems, such as existing since accuracy of instrument scope can not enough measure broadband noise.

Description

Auxiliary low noise broadband amplifying device is used in one kind test

Technical field

A kind of test auxiliary low noise broadband amplifying device is the utility model is related to, belongs to electronics broad band amplifier technology neck Domain.

Background technology

In a wireless communication system, when co-located several radio station work at the same time, the broadband noise of transmitting station influences whether The reception in other radio station；Therefore, broadband noise become develop, during debugging and production radio station the technical indicator that must measure it One.Generally use spectrum analyzer obtains the technical indicator in radio station, but is found in actually measuring, by spectrum analyzer dynamic The limitation of scope, the broadband noise that catch, measure radio station are not easy to, in order to obtain accurate broadband noise test number According to, it is quite necessary to research and develop it is a simple in structure, it is versatile, be convenient to use and carry, the scope of application is penetrated for 10MHz~1GHz Frequency signal amplifying apparatus, obtains accurate, stable broadband noise data, solves in being tested in radio station, broadband noise index is due to instrument The problem of meter accuracy scope can not enough measure.

The content of the invention

The purpose of this utility model is that in view of the above shortcomings of the prior art, there is provided a kind of simple in structure, versatility By force, it is convenient to use and carry, the scope of application is wide, and acquisition broadband noise data are accurate, stablize, and solve radio station test process, broadband is made an uproar Sound index is since accuracy of instrument scope is not enough and the problem of can not measure.

The utility model is to realize above-mentioned purpose by the following technical solutions：

The test auxiliary low noise broadband amplifying device by cavity, circuit board, input port, delivery outlet, power interface, connect Ground terminal, gain control switch are formed, and circuit board is provided with cavity, be provided with outside cavity input port, delivery outlet, power interface, Ground terminal, gain control switch；It is characterized in that：Circuit board is made of amplifying circuit, power circuit, gain control circuit；Put Big circuit includes two amplification modules of N2, N3, and N3 forms primary amplification module, and N2 forms two level amplification module；N3 amplification modules Input terminal be connected with input port, the output terminal of N3 amplification modules is connected by diode VD1 with delivery outlet, and N3 amplification modules lead to The input terminal that diode VD2 is crossed with N2 amplification modules is connected, and the output terminal of N2 amplification modules is connected by diode VD3 and delivery outlet Connect；

Gain control circuit is by N1 control chips, field-effect tube V1, field-effect tube V2, diode VD1, diode VD2, two Pole pipe VD3 is formed, and N1 control chips produce forward and reverse control signal and control field-effect tube V1, the break-make of field-effect tube V2 respectively, To control diode VD1 to turn on, while diode VD2, VD3 end, and circuit obtains the gain amplification of 15dB at this time；Conversely, two Pole pipe VD1 ends, while diode VD2, VD3 are turned on, and circuit obtains the gain amplification of 30dB.

The power circuit is made of the voltage stabilizing chip of model 78L05, and power circuit passes through binding post and direct current 12V Connection ,+5V ,+12V power supplies are provided for whole device.

The model 74AHC1G00 of the N1 control chips of the gain control circuit.

The N3 primary amplification module of the amplifying circuit and the model of N2 two level amplification modules are PGA-105+.

The beneficial effect of the utility model compared with prior art is：

There is test auxiliary low noise broadband amplifying device the low and flexible gain of amplification noise to select, structure letter It is single, carry, is easy to operate.There is good amplification effect to the radiofrequency signal in 10MHz~1GHz band limits.Both can make Used for the auxiliary amplifying device of testing broad-band noise signal, and can be used as preamplifier.It is versatile, use, carrying side Just, the scope of application is wide, and acquisition broadband noise data are accurate, stablize, and solve in the test process of rf broadband noise, due to The problem of accuracy of instrument can not enough be tested.

Brief description of the drawings

Fig. 1 is a kind of overall structure diagram of test auxiliary low noise broadband amplifying device；

Fig. 2 is the operation principle schematic diagram of the level-one amplifying circuit of amplifying circuit；

Fig. 3 is the operation principle schematic diagram of the second amplifying circuit of amplifying circuit；

Fig. 4 is the operation principle schematic diagram of gain control circuit；

Fig. 5 is the operation principle schematic diagram of power circuit.

In figure：1st, cavity, 2, circuit board, 3, input port, 4, delivery outlet, 5, power interface, 6, ground terminal, 7, gain control Switch.

Embodiment

The test embodiment of auxiliary low noise broadband amplifying device is made further specifically below in conjunction with the accompanying drawings It is bright：

Test is with auxiliary low noise broadband amplifying device by cavity 1, circuit board 2, input port 3, delivery outlet 4, power interface 5th, ground terminal 6, gain control switch 7 are formed, and circuit board 2 is provided with cavity 1, input port 3, delivery outlet are provided with outside cavity 1 4th, power interface 5, ground terminal 6, gain control switch 7；Circuit board 2 is by amplifying circuit, power circuit, gain control circuit group Into；Amplifying circuit includes two amplification modules of N2, N3, and N3 forms primary amplification module, and N2 forms two level amplification module；N3 amplifies The input terminal of module is connected with input port 3, and the output terminal of N3 amplification modules is connected by diode VD1 with delivery outlet 4, N3 amplifications Module is connected by diode VD2 with the input terminal of N2 two level amplification modules, and the output terminal of N2 amplification modules passes through diode VD3 It is connected with delivery outlet 4；

The model 74AHC1G00 of the N1 control chips of the gain control circuit.

The N3 primary amplification module of the amplifying circuit and the model of N2 two level amplification modules are PGA-105+（Referring to Fig. 1~5）.

The test is with the circuit board 2 of auxiliary low noise broadband amplifying device by power circuit, gain control circuit, amplification electricity Road forms.

Specifically：Power circuit is connected to whole device offer+5V ,+12V power supply, power supply by binding post and direct current 12V Circuit is mainly made of voltage stabilizing chip N4, its model 78LO5（Referring to Fig. 5）.

Gain control circuit is used for completing the gain control of whole device.Gain control switch 7 is used for controlling whole device The switching of 15dB and 30dB gains.The model 74AHC1G04 of N1 in gain control circuit, be one piece can to signal into The reverse integration gain control chip of row, gain control circuit input produce one group of opposite control signal, positive countercharge by N1 Conducting, the cut-off of signal control field effect transistor switch pipe V1 and V2 processed, in this way so that gain control signal A and gain control Signal B high-low voltages change processed, the break-make of PIN diode VD1, VD2, VD3 are controlled by the change of these voltages.

During work, gain control switch 7 is grounded, field effect transistor switch pipe V1 cut-offs, V2 conductings, and gain control signal B is lower Voltage, gain control signal A become high voltage, diode VD1 conductings, VD2 and VD3 cut-offs, and it is 15dB gains to export signal at this time； Otherwise gain control switch 7 is hanging, field effect transistor switch pipe V1 conductings, V2 cut-offs, gain control signal A change low-voltages, gain control Signal B processed becomes high voltage, diode VD1 cut-offs, VD2 and VD3 conductings, and it is 30dB gains to export signal at this time.

Amplifying circuit realizes that the model of amplification module N2, N3 are PGA-105+ by amplification module N2, N3；Signal Come in by the input terminal input of amplifying circuit, level-one amplification output is carried out by N3 amplification modules, during high-gain, is amplified by N3 The signal of module amplification is entered after N2 amplification modules carry out secondary amplification and exported.

The amplitude that the utility model improves measured signal, test result slightly compensation calculation are placed in spectrum analyzer front end Accurate test data can be obtained.Make simply, it is cheap, improve test job efficiency.

The above is the preferred embodiment of the utility model, and the example above illustrates not to the reality of the utility model Matter content makees limitation in any form, and person of an ordinary skill in the technical field is after this specification has been read according to this reality Any simple modification or deformation made with new technical spirit to above embodiment, and taken off possibly also with above-mentioned The technology contents shown are changed or are modified to the equivalent embodiment of equivalent variations, still fall within technical solutions of the utility model In the range of, without departing from the spirit and scope of the utility model.

Claims

1. auxiliary low noise broadband amplifying device is used in one kind test, it is by cavity（1）, circuit board（2）, input port（3）, delivery outlet （4）, power interface（5）, ground terminal（6）, gain control switch（7）Form, cavity（1）Circuit board is inside installed（2）, cavity （1）Input port is installed outside（3）, delivery outlet（4）, power interface（5）, ground terminal（6）, gain control switch（7）；Its feature exists In：Circuit board（2）It is made of amplifying circuit, power circuit, gain control circuit；Amplifying circuit includes two amplification moulds of N2, N3 Block, N3 form primary amplification module, and N2 forms two level amplification module；The input terminal of N3 amplification modules and input port（3）Connection, N3 The output terminal of amplification module passes through diode VD1 and delivery outlet（4）Connection, N3 amplification modules pass through diode VD2 and N2 two levels The input terminal connection of amplification module, the output terminal of N2 amplification modules pass through diode VD3 and delivery outlet（4）Connection；

Gain control circuit is by N1 control chips, field-effect tube V1, field-effect tube V2, diode VD1, diode VD2, diode VD3 is formed, and N1 control chips produce forward and reverse control signal and control field-effect tube V1, the break-make of field-effect tube V2 respectively, with control Diode VD1 conductings processed, while diode VD2, VD3 end, circuit obtains the gain amplification of 15dB at this time；Conversely, diode VD1 ends, while diode VD2, VD3 are turned on, and circuit obtains the gain amplification of 30dB.

2. auxiliary low noise broadband amplifying device is used in a kind of test according to claim 1, it is characterised in that：The electricity Source circuit is made of the voltage stabilizing chip of model 78L05, and power circuit is connected by binding post with direct current 12V, is whole device Offer+5V ,+12V power supply.

3. auxiliary low noise broadband amplifying device is used in a kind of test according to claim 1, it is characterised in that：The increasing The model 74AHC1G00 of the N1 control chips of beneficial control circuit.

4. auxiliary low noise broadband amplifying device is used in a kind of test according to claim 1, it is characterised in that：Described puts The big N3 primary amplification module of circuit and the model of N2 two level amplification modules are PGA-105+.