CN208172097U - Signal detection system - Google Patents
Signal detection system Download PDFInfo
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- CN208172097U CN208172097U CN201820636941.8U CN201820636941U CN208172097U CN 208172097 U CN208172097 U CN 208172097U CN 201820636941 U CN201820636941 U CN 201820636941U CN 208172097 U CN208172097 U CN 208172097U
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Abstract
The utility model belongs to signal detection technique field, provides a kind of signal detection system.The system comprises：Power supply device is connect with biased witch device and signal amplification circuit respectively, provides predeterminated voltage for biased witch device and signal amplification circuit；Biased witch device receives measured signal, is inputted according to user and provides operating voltage and working frequency for measured signal, and measured signal is exported to signal amplification circuit；Signal amplification circuit is connect with arrangements for analyzing frequency, is amplified to measured signal according to the predeterminated voltage, and amplified measured signal is sent to arrangements for analyzing frequency；Arrangements for analyzing frequency shows amplified measured signal.The utility model can more accurately detect distant signal, and system rejection to disturbance ability is strong, and signal leakage is small.
Description
Technical field
The utility model belongs to signal detection technique field, is to be related to a kind of signal detection system more specifically.
Background technique
When the local oscillation frequency signal test of microwave converter, shown on frequency spectrograph after local oscillation frequency signal is amplified, so
And in the prior art, amplifying device will cause signal interference when in use, and for apart from remote signal, due to signal
Weak, signal supervisory instrument will appear accidentally survey and test leakage phenomenon, reduce the accuracy of product test signal.
Utility model content
In view of this, the utility model embodiment provides a kind of signal detection system, to solve in the prior art remote
The problem of distance signal is weak, and signal supervisory instrument will appear accidentally survey and test leakage, and making the accuracy of product test signal reduces.
The utility model embodiment provides a kind of signal detection system, including：Power supply device, biased witch dress
It sets, signal amplification circuit and arrangements for analyzing frequency；
The power supply device is connect with the biased witch device and the signal amplification circuit respectively, is described inclined
It sets switching device and the signal amplification circuit provides predeterminated voltage；
The signal amplification circuit is connect with the arrangements for analyzing frequency；
The biased witch device receives measured signal, according to user's input be the measured signal provide operating voltage with
Working frequency, and the measured signal is exported to the signal amplification circuit；
The signal amplification circuit amplifies the measured signal according to the predeterminated voltage, will be amplified described
Measured signal is sent to the arrangements for analyzing frequency；
The arrangements for analyzing frequency shows the amplified measured signal.
Optionally, the signal amplification circuit includes：Voltage input end, signal input part and signal output end；
The voltage input end of the signal amplification circuit is connect with the power supply device, the signal amplification circuit
Signal input part is connect with the biased witch device, and the signal output end of the signal amplification circuit and the spectrum analysis fill
Set connection；
The signal amplification circuit further includes：Voltage stabilizing module, power supply module and amplification module；
The Voltage stabilizing module, input terminal are connect with the voltage input end of the signal amplification circuit, output end and the confession
The voltage input end of electric module connects, and receives the predeterminated voltage, the predeterminated voltage is divided to obtain first voltage, and
The first voltage is exported to the power supply module；
The power supply module, voltage output end are connect with the voltage end of the amplification module, are according to the first voltage
The amplification module provides bias voltage；
The amplification module, signal input part are connect with the signal input part of the signal amplification circuit, signal output end
It is connect with the signal output end of the signal amplification circuit, receives the measured signal, and according to the bias voltage to described
Measured signal amplifies.
Optionally, the Voltage stabilizing module includes：Voltage stabilizing chip, first capacitor, the second capacitor, third capacitor and diode；
The input pin of the voltage stabilizing chip is connect with the input terminal of the Voltage stabilizing module, and the output of the voltage stabilizing chip is drawn
The anode of foot and diode connects；
The first end of the first capacitor is connect with the input pin of the voltage stabilizing chip, the second end of the first capacitor
Ground connection；
The first end of second capacitor is connect with the output pin of the voltage stabilizing chip, the second end of second capacitor
Ground connection；
The first end of the third capacitor is connect with the output pin of the voltage stabilizing chip, the second end of the third capacitor
Ground connection；
The cathode of the diode is connect with the output end of the Voltage stabilizing module.
Optionally, the power supply module includes：D8400 chip, first resistor and second resistance；
The VCC pin of the D8400 chip is connect with the voltage input end of the power supply module, the D8400 chip
RCAL1 pin is grounded by the first resistor, and the RCAL2 pin of the D8400 chip is grounded by the second resistance；
D1 pin, G1 pin, D2 pin, G2 pin, D3 pin, G3 pin, D4 pin and the G4 of the D8400 chip draw
Foot is connect with the voltage output end of the power supply module.
Optionally, the power supply module further includes：4th capacitor, the 5th capacitor, the 6th capacitor and the 7th capacitor；
The first end of 4th capacitor and the first end of the 5th capacitor are connect with the VCC pin of the D8400 chip,
The second end of 4th capacitor and the second end of the 5th capacitor are grounded；
The CNB1 pin of the D8400 chip is connect by the 6th capacitor with the CNB2 pin of the D8400 chip, described
The CSUN pin of D8400 chip passes through the 7th capacity earth.
Optionally, the amplification module includes：Level-one amplifying unit, second level amplifying unit, three-level amplifying unit and level Four
Amplifying unit；
The level-one amplifying unit, signal input part are connect with the signal input part of the amplification module, signal output end
It is connect with the signal input part of the second level amplifying unit, the electricity of first voltage end and second voltage end with the amplification module
Press bond；
The second level amplifying unit, signal output end are connect with the signal input part of the three-level amplifying unit, the first electricity
Pressure side and second voltage end are connect with the voltage end of the amplification module；
The three-level amplifying unit, signal output end are connect with the signal input part of the level Four amplifying unit, the first electricity
Pressure side and second voltage end are connect with the voltage end of the amplification module；
The level Four amplifying unit, signal output end are connect with the signal output end of the amplification module, first voltage end
It is connect with the voltage end of the amplification module with second voltage end.
Optionally, the level-one amplifying unit includes the first transistor, the 8th capacitor, the 9th capacitor, 3rd resistor and
Four resistance；
The grid of the first transistor is connect with the signal input part of the level-one amplifying unit, the first transistor
Drain electrode connect with the signal output end of the level-one amplifying unit, the source electrode of the first transistor ground connection；
The first end of the 3rd resistor is connect with the first voltage end of the level-one amplifying unit, the 3rd resistor
Second end is connect with the grid of the first transistor；
The first end of 4th resistance is connect with the second voltage end of the level-one amplifying unit, the 4th resistance
Second end is connect with the drain electrode of the first transistor；
The first end of 8th capacitor is connect with the first end of the 3rd resistor, the second termination of the 8th capacitor
Ground；The first end of 9th capacitor is connect with the first end of the 4th resistance, the second end ground connection of the 9th capacitor；
The second level amplifying unit includes：Second transistor, the tenth capacitor, the 11st capacitor, the 5th resistance and the 6th electricity
Resistance；
The grid of the second transistor is connect with the signal input part of the second level amplifying unit, the second transistor
Drain electrode connect with the signal output end of the second level amplifying unit, the source electrode of second transistor ground connection；
The first end of 5th resistance is connect with the first voltage end of the second level amplifying unit, the 5th resistance
Second end is connect with the grid of the second transistor；
The first end of 6th resistance is connect with the second voltage end of the second level amplifying unit, the 6th resistance
Second end is connect with the drain electrode of the second transistor；
The first end of tenth capacitor is connect with the first end of the 5th resistance, the second termination of the tenth capacitor
Ground；The first end of 11st capacitor is connect with the first end of the 6th resistance, the second termination of the 11st capacitor
Ground；
The three-level amplifying unit includes：Third transistor, the 12nd capacitor, the 13rd capacitor, the 7th resistance and the 8th
Resistance；
The grid of the third transistor is connect with the signal input part of the three-level amplifying unit, the third transistor
Drain electrode connect with the signal output end of the three-level amplifying unit, the source electrode of third transistor ground connection；
The first end of 7th resistance is connect with the first voltage end of the three-level amplifying unit, the 7th resistance
Second end is connect with the grid of the third transistor；
The first end of 8th resistance is connect with the second voltage end of the three-level amplifying unit, the 8th resistance
Second end is connect with the drain electrode of the third transistor；
The first end of 12nd capacitor is connect with the first end of the 7th resistance, and the second of the 12nd capacitor
End ground connection；The first end of 13rd capacitor is connect with the first end of the 8th resistance, and the second of the 13rd capacitor
End ground connection；
The level Four amplifying unit includes：4th transistor, the 14th capacitor, the 15th capacitor, the 9th resistance and the tenth
Resistance；
The grid of 4th transistor is connect with the signal input part of the level Four amplifying unit, the 4th transistor
Drain electrode connect with the signal output end of the level Four amplifying unit, the source electrode of the 4th transistor ground connection；
The first end of 9th resistance is connect with the first voltage end of the level Four amplifying unit, the 9th resistance
Second end is connect with the grid of the 4th transistor；
The first end of tenth resistance is connect with the second voltage end of the level Four amplifying unit, the tenth resistance
Second end is connect with the drain electrode of the 4th transistor；
The first end of 14th capacitor is connect with the first end of the 9th resistance, and the second of the 14th capacitor
End ground connection；The first end of 15th capacitor is connect with the first end of the tenth resistance, and the second of the 15th capacitor
End ground connection.
Optionally, the amplification module further includes：First filter unit, the second filter unit and third filter unit；
First filter unit, input terminal are connect with the signal output end of the level-one amplifying unit, output end and institute
State the signal input part connection of second level amplifying unit；
Second filter unit, input terminal are connect with the signal output end of the second level amplifying unit, output end and institute
State the signal input part connection of three-level amplifying unit；
The third filter unit, input terminal are connect with the signal output end of the three-level amplifying unit, output end and institute
State the signal input part connection of level Four amplifying unit.
Optionally, first filter unit includes：16th capacitor and the 17th capacitor；
The first end of 16th capacitor is connect with the input terminal of first filter unit, the 16th capacitor
Second end is connect with the output end of first filter unit；
The first end of 17th capacitor is connect with the first end of the 16th capacitor, and the of the 17th capacitor
Two ends are connect with the second end of the 16th capacitor；
Second filter unit includes：18th capacitor and the 19th capacitor；
The first end of 18th capacitor is connect with the input terminal of second filter unit, the 18th capacitor
Second end is connect with the output end of second filter unit；
The first end of 19th capacitor is connect with the first end of the 18th capacitor, and the of the 19th capacitor
Two ends are connect with the second end of the 18th capacitor；
The third filter unit includes：20th capacitor and the 21st capacitor；
The first end of 20th capacitor is connect with the input terminal of the third filter unit, the 20th capacitor
Second end is connect with the output end of the third filter unit；
The first end of 21st capacitor is connect with the first end of the 20th capacitor, the 21st capacitor
Second end connect with the second end of the 20th capacitor.
Optionally, the signal amplification circuit further includes：22nd capacitor；
The signal output end of the amplification module passes through the signal of the 22nd capacitor and the signal amplification circuit
Output end connection.
The beneficial effect of signal detection system compared with prior art in the utility model embodiment is：Power supply supply
Device provides predeterminated voltage for biased witch device and signal amplification circuit；Biased witch device receive measured signal, according to
Family input provides operating voltage and working frequency for measured signal, and measured signal is exported to signal amplification circuit；Signal is put
Big circuit amplifies to measured signal according to the predeterminated voltage, and amplified measured signal is sent to spectrum analysis dress
It sets；Arrangements for analyzing frequency shows amplified measured signal, realizes and accurately detects distant signal, and system is anti-
Interference performance is strong, and signal leakage is small.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of signal detection system provided by the embodiment of the utility model；
Fig. 2 is the circuit diagram of signal amplification circuit provided by the embodiment of the utility model.
Specific embodiment
In order to which technical problem to be solved in the utility model, technical solution and beneficial effect is more clearly understood, with
Lower combination accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein
It applies example to be only used to explain the utility model, is not used to limit the utility model.
Referring to Fig. 1 and Fig. 2, a kind of signal detection system provided by the embodiment of the utility model, including power supply device
100, biased witch device 200, signal amplification circuit 300 and arrangements for analyzing frequency 400.
Power supply device 100 is connect with biased witch device 200 and signal amplification circuit 300 respectively；Power supply supply dress
It sets 100 and provides predeterminated voltage for biased witch device 200 and signal amplification circuit 300.
Signal amplification circuit 300 is connect with institute arrangements for analyzing frequency 400.
Biased witch device 200 receive measured signal, according to user input be the measured signal provide operating voltage with
Working frequency, and the measured signal is exported to signal amplification circuit 300.
Signal amplification circuit 300 amplifies the measured signal according to the predeterminated voltage, will be amplified described
Measured signal is sent to arrangements for analyzing frequency 400.
Arrangements for analyzing frequency 400 shows the amplified measured signal.
Above-mentioned signal detection system, power supply device 100 are that biased witch device 200 and signal amplification circuit 300 mention
For predeterminated voltage；Biased witch device 200 receives measured signal, is inputted according to user and provides operating voltage and work for measured signal
Working frequency, and measured signal is exported to signal amplification circuit 300；Signal amplification circuit 300 is treated according to the predeterminated voltage
It surveys signal and carries out level Four amplification, amplified measured signal is sent to arrangements for analyzing frequency 400；Arrangements for analyzing frequency 400 is right
Amplified measured signal is shown, is realized and is accurately detected distant signal, and system rejection to disturbance ability is strong, and signal is let out
Reveal small.
Further, in a specific embodiment, signal amplification circuit 300 includes：Voltage input end, signal input part and
Signal output end.
The voltage input end of signal amplification circuit 300 is connect with power supply device 100, the letter of signal amplification circuit 300
Number input terminal is connect with biased witch device 200, and the signal output end and arrangements for analyzing frequency 400 of signal amplification circuit 300 connect
It connects.
Signal amplification circuit 300 further includes：Voltage stabilizing module 310, power supply module 320 and amplification module 330.
The input terminal of Voltage stabilizing module 310 is connect with the voltage input end of signal amplification circuit 300, Voltage stabilizing module 310 it is defeated
Outlet is connect with the voltage input end of power supply module 320；Voltage stabilizing module 310 receives the predeterminated voltage, by the predeterminated voltage
It is divided to obtain first voltage, and the first voltage is exported to power supply module 320.
Optionally, Voltage stabilizing module 310 is also used to carry out steady pressure treatment to the predeterminated voltage, obtains more precisely and more stable
The first voltage, provide more accurately voltage for power supply module 320.
The voltage output end of power supply module 320 is connect with the voltage end of amplification module 330；Power supply module 320 is according to described
First voltage is that amplification module 330 provides bias voltage.
The signal input part of amplification module 330 is connect with the signal input part of signal amplification circuit 300, amplification module 330
Signal output end connect with the signal output end of signal amplification circuit 300；Amplification module 330 receives the measured signal, and
The measured signal is amplified according to the bias voltage.
Above-mentioned signal amplification circuit 300, Voltage stabilizing module 310 are divided the predeterminated voltage to obtain first voltage, and
The first voltage is exported to power supply module 320；Power supply module 320 is that amplification module 330 provides according to the first voltage
Bias voltage；Amplification module 330 amplifies the measured signal according to the bias voltage, can more accurately detect remote
Distance signal, and circuit anti-interference ability is strong, reduces signal leakage.
Further, referring to fig. 2, in a specific embodiment, the Voltage stabilizing module includes：Voltage stabilizing chip, first capacitor
C1, the second capacitor C2, third capacitor C3 and diode D1.
The input pin (1 pin) of voltage stabilizing chip is connect with the input terminal of Voltage stabilizing module 310, the output pin of voltage stabilizing chip
(3 pin) is connect with the anode of diode D1.
The first end of first capacitor C1 and the input pin of voltage stabilizing chip connect, the second end ground connection of first capacitor C1.
The first end of second capacitor C2 and the output pin of voltage stabilizing chip connect, the second end ground connection of the second capacitor C2.
The first end of third capacitor C3 and the output pin of voltage stabilizing chip connect, the second end ground connection of third capacitor C3.
Optionally, the voltage stabilizing chip can be IC7806 chip.
The cathode of diode D1 is connect with the output end of Voltage stabilizing module 310.
Above-mentioned Voltage stabilizing module 310 is divided to obtain first voltage to the predeterminated voltage of power supply device 100,
And steady pressure treatment is carried out to the predeterminated voltage, work that is more acurrate, more meeting power supply module 320 is provided for power supply module 320
Voltage.
Further, referring to fig. 2, in a specific embodiment, power supply module 320 includes：D8400 chip, first resistor
R1 and second resistance R2.
The VCC pin of D8400 chip is connect with the voltage input end of power supply module 320, the RCAL1 pin of D8400 chip
It is grounded by first resistor R1, the RCAL2 pin of D8400 chip is grounded by second resistance R2.
The D1 pin of D8400 chip, G1 pin, D2 pin, G2 pin, D3 pin, G3 pin, D4 pin and G4 pin are equal
It is connect with the voltage output end of power supply module 320.
Optionally, power supply module 320 further includes：4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6 and the 7th capacitor
C7。
The first end of 4th capacitor C4 and the first end of the 5th capacitor C5 are connect with the VCC pin of D8400 chip, and the 4th
The second end of capacitor C4 and the second end of the 5th capacitor C5 are grounded.
4th capacitor C4 and the 5th capacitor C5 is for being filtered the first voltage of 310 import and export of Voltage stabilizing module.
The CNB1 pin of D8400 chip is connect by the 6th capacitor C6 with the CNB2 pin of D8400 chip, D8400 chip
CSUN pin pass through the 7th capacitor C7 be grounded.
Above-mentioned power supply module 320 can be provided for the transistor of amplification module 330 by D8400 chip and accurately be biased
Voltage, and there is protective effect in the case where overload or short circuit, avoid the damage of the circuit to power supply module 320.
Further, referring to fig. 2, in a specific embodiment, amplification module 330 includes：Level-one amplifying unit 331, two
Grade amplifying unit 332, three-level amplifying unit 333 and level Four amplifying unit 334.
The signal input part of level-one amplifying unit 331 is connect with the signal input part of amplification module 330, level-one amplifying unit
331 signal output ends are connect with the signal input part of second level amplifying unit 332, the first voltage end of level-one amplifying unit 331 and
Second voltage end is connect with the voltage end of amplification module 330.
The signal output end of second level amplifying unit 332 is connect with the signal input part of three-level amplifying unit 333, second level amplification
The first voltage end and second voltage end of unit 332 are connect with the voltage end of amplification module 330.
The signal output end of three-level amplifying unit 333 is connect with the signal input part of level Four amplifying unit 334, three-level amplification
The first voltage end and second voltage end of unit 333 are connect with the voltage end of amplification module 330.
The signal output end of level Four amplifying unit 334 is connect with the signal output end of amplification module 330, level Four amplifying unit
334 first voltage end and second voltage end are connect with the voltage end of amplification module 330.
Specifically, the first voltage end of level-one amplifying unit 331 is connect with the G2 pin of D8400 chip, level-one amplification is single
The second voltage end of member 331 is connect with the D2 pin of D8400 chip, the first voltage end of second level amplifying unit 332 and D8400 core
The G1 pin of piece connects, and the second voltage end of second level amplifying unit 332 is connect with the D1 pin of D8400 chip, and three-level amplification is single
The first voltage end of member 333 is connect with the G3 pin of D8400 chip, the second voltage end of three-level amplifying unit 333 and D8400 core
The D3 pin of piece connects, and the first voltage end of level Four amplifying unit 334 is connect with the G4 pin of D8400 chip, and level Four amplification is single
The second voltage end of member 334 is connect with the D4 pin of D8400 chip.
Further, level-one amplifying unit 331 includes the first transistor Q1, the 8th capacitor C8, the 9th capacitor C9, third electricity
Hinder R3 and the 4th resistance R4.
The grid of the first transistor Q1 is connect with the signal input part of level-one amplifying unit 331, the leakage of the first transistor Q1
Pole is connect with the signal output end of level-one amplifying unit 331, the source electrode ground connection of the first transistor Q1.
The first end of 3rd resistor R3 is connect with the first voltage end of level-one amplifying unit 331, and the second of 3rd resistor R3
End is connect with the grid of the first transistor Q1.
The first end of 4th resistance R4 is connect with the second voltage end of level-one amplifying unit 331, and the second of the 4th resistance R4
End is connect with the drain electrode of the first transistor Q1.
The first end of 8th capacitor C8 is connect with the first end of 3rd resistor R3, the second end ground connection of the 8th capacitor C8；The
The first end of nine capacitor C9 is connect with the first end of the 4th resistance R4, the second end ground connection of the 9th capacitor C9.
Optionally, second level amplifying unit 332 includes：Second transistor Q2, the tenth capacitor C10, the 11st capacitor C11,
Five resistance R5 and the 6th resistance R6.
The grid of second transistor Q2 is connect with the signal input part of second level amplifying unit 332, the leakage of second transistor Q2
Pole is connect with the signal output end of second level amplifying unit 332, the source electrode ground connection of second transistor Q2.
The first end of 5th resistance R5 is connect with the first voltage end of second level amplifying unit 332, and the second of the 5th resistance R5
End is connect with the grid of second transistor Q2.
The first end of 6th resistance R6 is connect with the second voltage end of second level amplifying unit 332, and the second of the 6th resistance R6
End is connect with the drain electrode of second transistor Q2.
The first end of tenth capacitor C10 is connect with the first end of the 5th resistance R5, the second end ground connection of the tenth capacitor C10；
The first end of 11st capacitor C11 is connect with the first end of the 6th resistance R6, the second end ground connection of the 11st capacitor C11.
Optionally, three-level amplifying unit 333 includes：Third transistor Q3, the 12nd capacitor C12, the 13rd capacitor C13,
7th resistance R7 and the 8th resistance R8.
The grid of third transistor Q3 is connect with the signal input part of three-level amplifying unit 333, the leakage of third transistor Q3
Pole is connect with the signal output end of three-level amplifying unit 333, the source electrode ground connection of third transistor Q3.
The first end of 7th resistance R7 is connect with the first voltage end of three-level amplifying unit 333, and the second of the 7th resistance R7
End is connect with the grid of third transistor Q3.
The first end of 8th resistance R8 is connect with the second voltage end of three-level amplifying unit 333, and the second of the 8th resistance R8
End is connect with the drain electrode of third transistor Q3.
The first end of 12nd capacitor C12 is connect with the first end of the 7th resistance R7, the second termination of the 12nd capacitor C12
Ground；The first end of 13rd capacitor C13 is connect with the first end of the 8th resistance R8, the second end ground connection of the 13rd capacitor C13.
Optionally, level Four amplifying unit 334 includes：4th transistor Q4, the 14th capacitor C14, the 15th capacitor C15,
9th resistance R9 and the tenth resistance R10.
The grid of 4th transistor Q4 is connect with the signal input part of level Four amplifying unit 334, the leakage of the 4th transistor Q4
Pole is connect with the signal output end of level Four amplifying unit 334, the source electrode ground connection of the 4th transistor Q4.
The first end of 9th resistance R9 is connect with the first voltage end of level Four amplifying unit 334, and the second of the 9th resistance R9
End is connect with the grid of the 4th transistor Q4.
The first end of tenth resistance R10 is connect with the second voltage end of level Four amplifying unit 334, and the of the tenth resistance R10
Two ends are connect with the drain electrode of the 4th transistor Q4.
The first end of 14th capacitor C14 is connect with the first end of the 9th resistance R9, the second termination of the 14th capacitor C14
Ground；The first end of 15th capacitor C15 is connect with the first end of the tenth resistance R10, the second end ground connection of the 15th capacitor C15.
Specifically, signal amplification circuit 300 uses level Four amplifying unit carries out method to measured signal, greatly enhance
Distant signal, to solve can't detect since the signal of distant signal is weak, make signal detection system occur accidentally surveying and
The problem of test leakage, and then the signal for detecting the signal detection system of the present embodiment is more accurate.
Further, in one embodiment, amplification module 300 further includes：First filter unit 335, the second filter unit
336 and third filter unit 337.
The input terminal of first filter unit 335 is connect with the signal output end of level-one amplifying unit 331, the first filter unit
335 output end is connect with the signal input part of second level amplifying unit 332.
The input terminal of second filter unit 336 is connect with the signal output end of the second level amplifying unit 332, the second filtering
The output end of unit 336 is connect with the signal input part of three-level amplifying unit 333.
The input terminal of third filter unit 337 is connect with the signal output end of three-level amplifying unit 333, third filter unit
337 output end is connect with the signal input part of level Four amplifying unit 334.
Optionally, the first filter unit 335 includes：16th capacitor C16 and the 17th capacitor C17.
The first end of 16th capacitor C16 is connect with the input terminal of the first filter unit 335, and the of the 16th capacitor C16
Two ends are connect with the output end of the first filter unit 335.
The first end of 17th capacitor C17 is connect with the first end of the 16th capacitor C16, and the second of the 17th capacitor C17
End is connect with the second end of the 16th capacitor C16.
Optionally, the second filter unit 336 includes：18th capacitor C18 and the 19th capacitor C19.
The first end of 18th capacitor C18 is connect with the input terminal of the second filter unit 336, and the of the 18th capacitor C18
Two ends are connect with the output end of the second filter unit 336.
The first end of 19th capacitor C19 is connect with the first end of the 18th capacitor C18, and the second of the 19th capacitor C19
End is connect with the second end of the 18th capacitor C18.
Optionally, third filter unit 337 includes：20th capacitor C20 and the 21st capacitor C21.
The first end of 20th capacitor C20 is connect with the input terminal of third filter unit 337, and the of the 20th capacitor C20
Two ends are connect with the output end of third filter unit 337.
The first end of 21st capacitor C21 is connect with the first end of the 20th capacitor C20, the 21st capacitor C21's
Second end is connect with the second end of the 20th capacitor C20.
Specifically, signal amplification circuit 300 is single by the first filter unit 335, the second filter unit 336 and third filtering
The amplified signal of the amplifying unit output of 337 pairs of every level-ones of member is filtered, and is greatly reduced interference of the noise to signal, is made letter
The measured signal amplified in number amplifying circuit 300 is more accurate.
Further, in one embodiment, signal amplification circuit 300 further includes：22nd capacitor C22.
The signal output end of amplification module 330 is exported by the signal of the 22nd capacitor C22 and signal amplification circuit 300
End connection.
The amplified measured signal that 22nd capacitor C22 is used to export amplification module 330 is filtered, and reduces letter
The interference of noise in number keeps the measured signal for being input to arrangements for analyzing frequency 400 more accurate.
Measured signal is transmitted directly in signal amplification circuit 300 by above-mentioned amplification module 330, biased witch device 200
It amplifies, rather than is received automatically by the antenna of amplifying circuit 300, avoid amplifying circuit 300 and receive external interference signal,
Level Four amplifying unit is used simultaneously and carries out method to measured signal, significantly enhances distant signal, further through the first filter
Wave unit 335, the second filter unit 336 and third filter unit 337 to the amplified signal of the amplifying unit of every level-one output into
Row filtering, greatly reduces interference of the noise to signal, solving can't detect since the signal of distant signal is weak, make letter
Number detection system occurs accidentally surveying and the problem of test leakage, and then the signal for detecting the signal detection system of the present embodiment is more smart
It is quasi-.
In the present embodiment, it is pre- to be that biased witch device 200 and signal amplification circuit 300 provide for power supply device 100
If voltage；Biased witch device 200 receives measured signal, is inputted according to user and provides operating voltage and work frequency for measured signal
Rate, and measured signal is exported to signal amplification circuit 300；Signal amplification circuit 300 is according to the predeterminated voltage to letter to be measured
It number amplifies, amplified measured signal is sent to arrangements for analyzing frequency 400；Arrangements for analyzing frequency 400 is to amplified
Measured signal is shown, is realized and is accurately detected distant signal, and system rejection to disturbance ability is strong, and signal leakage is small.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (10)
1. a kind of signal detection system, which is characterized in that including power supply device, biased witch device, signal amplification circuit
And arrangements for analyzing frequency；
The power supply device is connect with the biased witch device and the signal amplification circuit respectively, is offseted away to be described
It closes device and the signal amplification circuit provides predeterminated voltage；
The signal amplification circuit is connect with the arrangements for analyzing frequency；
The biased witch device receives measured signal, is inputted according to user and provides operating voltage and work for the measured signal
Frequency, and the measured signal is exported to the signal amplification circuit；
The signal amplification circuit amplifies the measured signal according to the predeterminated voltage, will be amplified described to be measured
Signal is sent to the arrangements for analyzing frequency；
The arrangements for analyzing frequency shows the amplified measured signal.
2. signal detection system as described in claim 1, which is characterized in that the signal amplification circuit includes：Voltage input
End, signal input part and signal output end；
The voltage input end of the signal amplification circuit is connect with the power supply device, the signal of the signal amplification circuit
Input terminal is connect with the biased witch device, and the signal output end of the signal amplification circuit and the arrangements for analyzing frequency connect
It connects；
The signal amplification circuit further includes：Voltage stabilizing module, power supply module and amplification module；
The Voltage stabilizing module, input terminal are connect with the voltage input end of the signal amplification circuit, output end and the power supply mould
The voltage input end of block connects, and receives the predeterminated voltage, is divided to obtain first voltage for the predeterminated voltage, and by institute
First voltage is stated to export to the power supply module；
The power supply module, voltage output end are connect with the voltage end of the amplification module, are described according to the first voltage
Amplification module provides bias voltage；
The amplification module, signal input part are connect with the signal input part of the signal amplification circuit, signal output end and institute
The signal output end connection for stating signal amplification circuit, receives the measured signal, and according to the bias voltage to described to be measured
Signal amplifies.
3. signal detection system as claimed in claim 2, which is characterized in that the Voltage stabilizing module includes：Voltage stabilizing chip, first
Capacitor, the second capacitor, third capacitor and diode；
The input pin of the voltage stabilizing chip is connect with the input terminal of the Voltage stabilizing module, the output pin of the voltage stabilizing chip with
The anode connection of diode；
The first end of the first capacitor is connect with the input pin of the voltage stabilizing chip, the second termination of the first capacitor
Ground；
The first end of second capacitor is connect with the output pin of the voltage stabilizing chip, the second termination of second capacitor
Ground；
The first end of the third capacitor is connect with the output pin of the voltage stabilizing chip, the second termination of the third capacitor
Ground；
The cathode of the diode is connect with the output end of the Voltage stabilizing module.
4. signal detection system as claimed in claim 2, which is characterized in that the power supply module includes：D8400 chip,
One resistance and second resistance；
The VCC pin of the D8400 chip is connect with the voltage input end of the power supply module, the RCAL1 of the D8400 chip
Pin is grounded by the first resistor, and the RCAL2 pin of the D8400 chip is grounded by the second resistance；
The D1 pin of the D8400 chip, G1 pin, D2 pin, G2 pin, D3 pin, G3 pin, D4 pin and G4 pin are equal
It is connect with the voltage output end of the power supply module.
5. signal detection system as claimed in claim 4, which is characterized in that the power supply module further includes：4th capacitor,
Five capacitors, the 6th capacitor and the 7th capacitor；
The first end of 4th capacitor and the first end of the 5th capacitor are connect with the VCC pin of the D8400 chip, described
The second end of 4th capacitor and the second end of the 5th capacitor are grounded；
The CNB1 pin of the D8400 chip is connect by the 6th capacitor with the CNB2 pin of the D8400 chip, described
The CSUN pin of D8400 chip passes through the 7th capacity earth.
6. signal detection system as claimed in claim 2, which is characterized in that the amplification module includes：Level-one amplifying unit,
Second level amplifying unit, three-level amplifying unit and level Four amplifying unit；
The level-one amplifying unit, signal input part are connect with the signal input part of the amplification module, signal output end and institute
State the signal input part connection of second level amplifying unit, the voltage end of first voltage end and second voltage end with the amplification module
Connection；
The second level amplifying unit, signal output end are connect with the signal input part of the three-level amplifying unit, first voltage end
It is connect with the voltage end of the amplification module with second voltage end；
The three-level amplifying unit, signal output end are connect with the signal input part of the level Four amplifying unit, first voltage end
It is connect with the voltage end of the amplification module with second voltage end；
The level Four amplifying unit, signal output end are connect with the signal output end of the amplification module, first voltage end and
Two voltage ends are connect with the voltage end of the amplification module.
7. signal detection system as claimed in claim 6, which is characterized in that the level-one amplifying unit includes first crystal
Pipe, the 8th capacitor, the 9th capacitor, 3rd resistor and the 4th resistance；
The grid of the first transistor is connect with the signal input part of the level-one amplifying unit, the leakage of the first transistor
Pole is connect with the signal output end of the level-one amplifying unit, the source electrode ground connection of the first transistor；
The first end of the 3rd resistor is connect with the first voltage end of the level-one amplifying unit, and the second of the 3rd resistor
End is connect with the grid of the first transistor；
The first end of 4th resistance is connect with the second voltage end of the level-one amplifying unit, and the second of the 4th resistance
End is connect with the drain electrode of the first transistor；
The first end of 8th capacitor is connect with the first end of the 3rd resistor, the second end ground connection of the 8th capacitor；
The first end of 9th capacitor is connect with the first end of the 4th resistance, the second end ground connection of the 9th capacitor；
The second level amplifying unit includes：Second transistor, the tenth capacitor, the 11st capacitor, the 5th resistance and the 6th resistance；
The grid of the second transistor is connect with the signal input part of the second level amplifying unit, the leakage of the second transistor
Pole is connect with the signal output end of the second level amplifying unit, the source electrode ground connection of the second transistor；
The first end of 5th resistance is connect with the first voltage end of the second level amplifying unit, and the second of the 5th resistance
End is connect with the grid of the second transistor；
The first end of 6th resistance is connect with the second voltage end of the second level amplifying unit, and the second of the 6th resistance
End is connect with the drain electrode of the second transistor；
The first end of tenth capacitor is connect with the first end of the 5th resistance, the second end ground connection of the tenth capacitor；
The first end of 11st capacitor is connect with the first end of the 6th resistance, the second end ground connection of the 11st capacitor；
The three-level amplifying unit includes：Third transistor, the 12nd capacitor, the 13rd capacitor, the 7th resistance and the 8th resistance；
The grid of the third transistor is connect with the signal input part of the three-level amplifying unit, the leakage of the third transistor
Pole is connect with the signal output end of the three-level amplifying unit, the source electrode ground connection of the third transistor；
The first end of 7th resistance is connect with the first voltage end of the three-level amplifying unit, and the second of the 7th resistance
End is connect with the grid of the third transistor；
The first end of 8th resistance is connect with the second voltage end of the three-level amplifying unit, and the second of the 8th resistance
End is connect with the drain electrode of the third transistor；
The first end of 12nd capacitor is connect with the first end of the 7th resistance, the second termination of the 12nd capacitor
Ground；The first end of 13rd capacitor is connect with the first end of the 8th resistance, the second termination of the 13rd capacitor
Ground；
The level Four amplifying unit includes：4th transistor, the 14th capacitor, the 15th capacitor, the 9th resistance and the tenth resistance；
The grid of 4th transistor is connect with the signal input part of the level Four amplifying unit, the leakage of the 4th transistor
Pole is connect with the signal output end of the level Four amplifying unit, the source electrode ground connection of the 4th transistor；
The first end of 9th resistance is connect with the first voltage end of the level Four amplifying unit, and the second of the 9th resistance
End is connect with the grid of the 4th transistor；
The first end of tenth resistance is connect with the second voltage end of the level Four amplifying unit, and the second of the tenth resistance
End is connect with the drain electrode of the 4th transistor；
The first end of 14th capacitor is connect with the first end of the 9th resistance, the second termination of the 14th capacitor
Ground；The first end of 15th capacitor is connect with the first end of the tenth resistance, the second termination of the 15th capacitor
Ground.
8. signal detection system as claimed in claim 7, which is characterized in that the amplification module further includes：First filtering is single
Member, the second filter unit and third filter unit；
First filter unit, input terminal are connect with the signal output end of the level-one amplifying unit, output end and described two
The signal input part connection of grade amplifying unit；
Second filter unit, input terminal are connect with the signal output end of the second level amplifying unit, output end and described three
The signal input part connection of grade amplifying unit；
The third filter unit, input terminal are connect with the signal output end of the three-level amplifying unit, output end and described four
The signal input part connection of grade amplifying unit.
9. signal detection system as claimed in claim 8, which is characterized in that first filter unit includes：16th electricity
Hold and the 17th capacitor；
The first end of 16th capacitor is connect with the input terminal of first filter unit, and the second of the 16th capacitor
End is connect with the output end of first filter unit；
The first end of 17th capacitor is connect with the first end of the 16th capacitor, the second end of the 17th capacitor
It is connect with the second end of the 16th capacitor；
Second filter unit includes：18th capacitor and the 19th capacitor；
The first end of 18th capacitor is connect with the input terminal of second filter unit, and the second of the 18th capacitor
End is connect with the output end of second filter unit；
The first end of 19th capacitor is connect with the first end of the 18th capacitor, the second end of the 19th capacitor
It is connect with the second end of the 18th capacitor；
The third filter unit includes：20th capacitor and the 21st capacitor；
The first end of 20th capacitor is connect with the input terminal of the third filter unit, and the second of the 20th capacitor
End is connect with the output end of the third filter unit；
The first end of 21st capacitor is connect with the first end of the 20th capacitor, and the of the 21st capacitor
Two ends are connect with the second end of the 20th capacitor.
10. the signal detection system as described in claim 2 to 9 is any, which is characterized in that the signal amplification circuit also wraps
It includes：22nd capacitor；
The signal output end of the amplification module is exported by the signal of the 22nd capacitor and the signal amplification circuit
End connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820636941.8U CN208172097U (en) | 2018-04-28 | 2018-04-28 | Signal detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820636941.8U CN208172097U (en) | 2018-04-28 | 2018-04-28 | Signal detection system |
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| Publication Number | Publication Date |
|---|---|
| CN208172097U true CN208172097U (en) | 2018-11-30 |
Family
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Family Applications (1)
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|---|---|---|---|
| CN201820636941.8U Active CN208172097U (en) | 2018-04-28 | 2018-04-28 | Signal detection system |
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| Country | Link |
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| CN (1) | CN208172097U (en) |
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2018
- 2018-04-28 CN CN201820636941.8U patent/CN208172097U/en active Active
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