CN105048803B - A kind of DC power supply circuit for Detection of Weak Signals - Google Patents
A kind of DC power supply circuit for Detection of Weak Signals Download PDFInfo
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- CN105048803B CN105048803B CN201410611922.6A CN201410611922A CN105048803B CN 105048803 B CN105048803 B CN 105048803B CN 201410611922 A CN201410611922 A CN 201410611922A CN 105048803 B CN105048803 B CN 105048803B
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Abstract
The present invention relates to microelectronics technologies, more particularly to a kind of DC power supply circuit for Detection of Weak Signals, including a preposition constant output voltage circuit, one symmetric circuit, one adjustable resistance, preposition output constant-voltage circuit is by insulting Li Erte low-power consumption DC/DC voltage switch converters LT3470, two variable resistance R1And R2, four fixed capacities and an inductance form, symmetric circuit is made of two amplifiers, four fixed resistances, adjustable resistance RrefVariation, realize the output current I of entire circuitOUTAdjusting.The present invention realizes adjusting of the small DC current in the range of low noise, wide frequency bandwidth, by adjusting adjustable resistance, realizes the matching with tested component.
Description
Technical field
The present invention relates to microelectronics technology more particularly to a kind of DC power supply circuits for Detection of Weak Signals.
Background technology
Detection of Weak Signals is a kind of technology specifically for noise, and main task is to improve signal-to-noise ratio, is dropped as far as possible
Noise level in low detection process.Technique of Weak Signal Detection all has a wide range of applications in many fields, such as physics,
Electrochemistry, biomedicine, astronomy, learn, magnetics etc..Detection object is typically all the ultra-weak electronic signal of sensor output.
In recent years, the demand being detected in microelectronics technology to small-signal is increasingly urgent, for being examined from electronics
The requirement that useful signal is extracted in examining system is also just higher and higher.As composition module most basic in electronic detection system,
DC power supply provides Constant Direct Current electric current for detector or detecting system, is most basic module in detecting system.DC power supply
Under the premise of power itself is ensured, there should be the low noise in wider operating frequency range, to meet the need of different application
It asks.
DC power supply is battery pack or is formed power circuit system based on various electronic components using more at present.Battery
The group general less stable of output current, particularly when battery pack exhausts, electric current arbitrarily disturbs, and can cause larger electronics
Noise jamming.Power circuit system different properties are formed based on various electronic components, are limited by various conditions, output noise
Poor-performing, the DC current work upper limit is smaller, and power work frequency range is little, and circuit structure is more complicated, it is difficult to
Maintenance and maintenance.Therefore electronic noise how is reduced in wider frequency range, and ensure the work upper limit of larger DC current
Become the critical issue of such power system circuit design.
Invention content
In view of the above problems, the present invention provides a kind of DC power supply circuit for Detection of Weak Signals, existing to solve
The defects of power-supply system output noise poor-performing, the current work upper limit are smaller in technology, and operating frequency range is relatively low.
Technical solution is used by the present invention solves above-mentioned technical problem：
A kind of DC power supply circuit for Detection of Weak Signals, wherein, including：
Preposition constant output voltage circuit, symmetric circuit, adjustable resistance；
The preposition constant output voltage circuit includes,
Control the icepro Li Erte DC/DC voltage switch converter LT3470 of voltage source constant output voltage, input voltage
Hold (VIN) and the first fixed capacity (C1) one end connect and access variable voltage source (VE), the first fixed capacity (C1) other end
The ground terminal (GND) of LT3470 is accessed, is formed to LT3470 Input voltage terminals (VIN) constant voltage input；Second fixed capacity
(C2) one end is connected with ground terminal (GND), the other end and inductance (L1) series connection access LT3470 inherent power selection end (SW) and
With third fixed capacity (C3) one end be connected, third fixed capacity (C3) other end access LT3470 driving voltage end
(BOOST)；Variable resistance (R1) one end access inductance (L1) and the second fixed capacity (C2) an intermediate node, the other end and the
Four fixed capacity (C4) it is connected and accesses the in-line power current terminal (BIAS) of LT3470；Variable resistance (R2) both ends and the 4th
Fixed capacity (C4) both ends are connected, it is respectively connected to the in-line power current terminal (BIAS) of LT3470 and switching frequency control terminal
(FB)；
The symmetric circuit includes,
First fixed resistance (R1A) one end and the second fixed resistance (R2A) one end is connected, integrated transporting discharging is accessed jointly
(AOP1) input cathode, integrated transporting discharging (AOP1) output terminal (b) and the second fixed resistance (R2A) other end connection, it is common to access
Third fixed resistance (R3A) one end, third fixed resistance (R3A) the other end and the 4th fixed resistance (R4A) one end be connected,
Common access integrated transporting discharging (AOP2) input anode, the 4th fixed resistance (R4A) the other end ground connection；Integrated transporting discharging (AOP2)
Input cathode is connected with its output terminal (c), while accesses adjustable resistance (Rref) one end, integrated transporting discharging (AOP1) input terminal
Anode and adjustable resistance (Rref) the other end (d) be connected；
Wherein, the first fixed resistance (R1A) the other end be connected to the second fixed capacity (C2) and inductance (L1)
Common end, the common end be the preposition constant output voltage circuit output voltage terminal (Va)。
Preferably, above-mentioned DC power supply circuit, wherein, the output voltage V of the preposition constant output voltage circuitaTable
It is shown as：
Wherein, the output voltage VaValue range be 1.25V~16V.
Preferably, above-mentioned DC power supply circuit, wherein, the output voltage V of the preposition constant output voltage circuitaTable
It is shown as：
Integrated transporting discharging (AOP1) output terminal (b) voltage-to-ground VbIt is expressed as：
Wherein VdFor adjustable resistance (Rref) the other end (d) voltage-to-ground.
Above-mentioned technical proposal has the following advantages that or advantageous effect：
The invention discloses a kind of DC power supply circuit for Detection of Weak Signals, including a preposition constant output electricity
Volt circuit, a symmetric circuit, an adjustable resistance, preposition output constant-voltage circuit is by insulting Li Erte low-power consumption DC/DC electricity
Compress switch converter LT3470, two variable resistance R1And R2, four fixed capacities and an inductance form, symmetric circuit is by two
A amplifier, four fixed resistances are formed, adjustable resistance RrefVariation, realize the output current I of entire circuitOUTTune
Section.The present invention realizes adjusting of the small DC current in the range of low noise, wide frequency bandwidth, by adjusting adjustable resistance,
Realize the matching with tested component.
Specific description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, the present invention and its feature, outer
Shape and advantage will become more apparent.Identical label indicates identical part in whole attached drawings.Not can according to than
Example draws attached drawing, it is preferred that emphasis is shows the purport of the present invention.
Fig. 1 is for the system structure diagram of the DC power supply circuit of Detection of Weak Signals in the present invention.
Specific embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings, but not as the limit of the present invention
It is fixed.
The system structure diagram of DC power supply circuit in Detection of Weak Signals as shown in Figure 1, the wherein direct current
Source circuit is included there are one preposition constant output voltage circuit, a symmetric circuit, and adjustable resistance be (wherein each device
Numerical value is as shown in fig. 1).
Wherein, preposition constant output voltage circuit includes one for controlling the icepro Li Erte that voltage source stabilizes the output voltage
DC/DC voltage switches converter LT3470, Input voltage terminal VINWith the first fixed capacity C1One end access together it is external can
Adjust voltage source VE, the first fixed capacity C1The other end accesses the ground GND of LT3470, forms to LT3470 Input voltage terminals VINIt is constant
Control source.Second fixed capacity C2One end is connected with ground GND, the other end and inductance L1It is connected and accesses the inherent power of LT3470
Select end SW, and with third fixed capacity C3One end be connected, third fixed capacity C3The other end accesses the driving voltage of LT3470
Hold BOOST.Inductance L1With fixed capacity C2With reference to two variable resistance R1And R2Composition plays the role of rectification, decompression.It can power transformation
Hinder (R1) one end access inductance (L1) and the second fixed capacity (C2) an intermediate node, the other end and the 4th fixed capacity (C4)
It is connected and accesses the in-line power current terminal (BIAS) of LT3470；Variable resistance (R2) both ends and the 4th fixed capacity (C4) two
End is connected, and is respectively connected to the in-line power current terminal (BIAS) of LT3470 and switching frequency control terminal (FB), changes so as to pass through
Variable resistance R2Value change the frequency of LT3470 internal pulses voltages.The output voltage V of preposition constant output voltage circuita
It can be expressed as：
Wherein, output voltage VaValue range is 1.25~16V, you can becomes resistance R1With variable resistance R2There are 1~12
Multiple proportion.
Symmetric circuit includes：First fixed resistance (R1A) one end and the second fixed resistance (R2A) one end is connected, connects jointly
Enter integrated transporting discharging (AOP1) input cathode, integrated transporting discharging (AOP1) output terminal (b) and the second fixed resistance (R2A) other end company
It connects, it is common to access third fixed resistance (R3A) one end, third fixed resistance (R3A) the other end and the 4th fixed resistance (R4A)
One end be connected, access integrated transporting discharging (AOP jointly2) input anode, the 4th fixed resistance (R4A) the other end ground connection；It is integrated
Amplifier (AOP2) input cathode is connected with its output terminal (c), while accesses adjustable resistance (Rref) one end, integrated transporting discharging
(AOP1) input anode and adjustable resistance (Rref) the other end (d) be connected；Wherein, the first fixed resistance (R1A) the other end
It is connected to the second fixed capacity (C2) and inductance (L1) common end, the common end be preposition constant output voltage circuit output
Voltage end (Va)。
Wherein, adjustable resistance (Rref) numerical value determine the current output value I of entire DC power supply circuitOUT。
It is calculated according to integrated transporting discharging, the corresponding voltage-to-ground V of node bbIt can be expressed as：
Wherein VdFor adjustable resistance (Rref) right end (d) node voltage-to-ground.
Adjustable resistance RrefLeft end (c) node voltage-to-ground VcIt can be expressed as：
If four resistance R1A=R2A=R3A=R4A=RNA, then adjustable resistance (R is flowed throughref) output current IOUTIt can table
It is shown as：
Therefore, we can obtain IOUTNumerical value by VaWith adjustable resistance (Rref) size determine, and integrated transporting discharging AOP2
Voltage saturation (Va=15V), then play the adjustable resistance (R of reference roleref) be 1k Ω when, IOUTMaximum value is 7.5mA.
But in practical applications cannot be essentially equal in view of four fixed resistances, meet corresponding close between each other
It is that formula is：R1A=δ × R2A, R3A=(δ+ε) × R4A, then DC power system output resistance ZSIt is expressed as：
Assuming that wherein δ ≈ 1, ε ≈ 0.0003, Rref=1k Ω, integrated transporting discharging amplification coefficient AD=106, then ZS ≈ 3M Ω.
In addition, the current noise power spectral density of DC power system is expressed as：
The low noise DC power supply circuit carried out using foregoing circuit figure, in the adjustable resistance (R for playing reference roleref)=
Under conditions of 1k Ω, maximum output current is up to 7mA, and output resistance is up to 3M Ω.Thermal noise power spectrum density is working frequency
Wider range is 0.01Hz~10kHz, and internal electron thermal noise power spectrum density isIn 1Hz
When, DC power system 1/f noise power spectral density is：
In conclusion the invention discloses a kind of DC power supply circuit for Detection of Weak Signals, it is preposition including one
Constant output voltage circuit, a symmetric circuit, an adjustable resistance, preposition output constant-voltage circuit is by insulting the low work(of Li Erte
Consume DC/DC voltage switch converters LT3470, two variable resistance R1And R2, four fixed capacities and an inductance form, symmetrically
Circuit is made of two amplifiers, four fixed resistances, adjustable resistance RrefVariation, realize the output current of entire circuit
IOUTAdjusting.The present invention realizes adjusting of the small DC current in the range of low noise, wide frequency bandwidth, can by adjusting
Resistance is adjusted, realizes the matching with tested component.
It should be appreciated by those skilled in the art that those skilled in the art combine the prior art and above-described embodiment can be with
Realize the change case, this will not be repeated here.Such change case does not affect the essence of the present invention, not superfluous herein
It states.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, wherein the equipment and structure be not described in detail to the greatest extent are construed as giving reality with the common mode in this field
It applies；Any those skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and technical content technical solution of the present invention is made many possible changes and modifications or be revised as equivalent variations etc.
Embodiment is imitated, this is not affected the essence of the present invention.Therefore, every content without departing from technical solution of the present invention, foundation
The technical spirit any simple modifications, equivalents, and modifications made to the above embodiment of the present invention, still fall within the present invention
In the range of technical solution protection.
Claims (3)
1. a kind of DC power supply circuit for Detection of Weak Signals, which is characterized in that including：
Preposition constant output voltage circuit, symmetric circuit, adjustable resistance；
The preposition constant output voltage circuit includes,
Control the icepro Li Erte DC/DC voltage switch converter LT3470 of voltage source constant output voltage, Input voltage terminal
(VIN) and the first fixed capacity (C1) one end connect and access variable voltage source (VE), the first fixed capacity (C1) another termination
Enter the ground terminal (GND) of LT3470, form to LT3470 Input voltage terminals (VIN) constant voltage input；Second fixed capacity (C2)
One end is connected with ground terminal (GND), the other end and inductance (L1) series connection access LT3470 inherent power selection end (SW) and with
Third fixed capacity (C3) one end be connected, third fixed capacity (C3) other end access LT3470 driving voltage end
(BOOST)；Variable resistance (R1) one end access inductance (L1) and the second fixed capacity (C2) an intermediate node, the other end and the
Four fixed capacity (C4) it is connected and accesses the in-line power current terminal (BIAS) of LT3470；Variable resistance (R2) both ends and the 4th
Fixed capacity (C4) both ends are connected, it is respectively connected to the in-line power current terminal (BIAS) of LT3470 and switching frequency control terminal
(FB)；
The symmetric circuit includes,
First fixed resistance (R1A) one end and the second fixed resistance (R2A) one end is connected, it is common to access the first integrated transporting discharging
(AOP1) input cathode, the first integrated transporting discharging (AOP1) output terminal (b) and the second fixed resistance (R2A) other end connection, jointly
Access third fixed resistance (R3A) one end, third fixed resistance (R3A) the other end and the 4th fixed resistance (R4A) one end
It is connected, it is common to access the second integrated transporting discharging (AOP2) input anode, the 4th fixed resistance (R4A) the other end ground connection；Second collection
Into amplifier (AOP2) input cathode is connected with its output terminal (c), while accesses adjustable resistance (Rref) one end, first is integrated
Amplifier (AOP1) input anode and adjustable resistance (Rref) the other end (d) be connected；
Wherein, the first fixed resistance (R1A) the other end be connected to the second fixed capacity (C2) and inductance (L1) public affairs
End altogether, the common end are the output voltage terminal (V of the preposition constant output voltage circuita)。
2. DC power supply circuit as described in claim 1, which is characterized in that the output of the preposition constant output voltage circuit
Voltage VaIt is expressed as：
Wherein, the value range of the output voltage Va is 1.25V~16V.
3. DC power supply circuit as claimed in claim 2, which is characterized in that the first integrated transporting discharging (AOP1) output terminal
(b) voltage-to-ground Vb is expressed as：
Wherein VdFor adjustable resistance (Rref) the other end (d) voltage-to-ground.
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| CN201410611922.6A CN105048803B (en) | 2014-11-04 | 2014-11-04 | A kind of DC power supply circuit for Detection of Weak Signals |
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| CN110501623A (en) * | 2019-08-29 | 2019-11-26 | 北京航空航天大学 | A kind of implementation method of low noise LDO output noise test |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102944250A (en) * | 2012-11-20 | 2013-02-27 | 中国航天科技集团公司第五研究院第五一〇研究所 | Front-end conditioning circuit for measuring high impedance weak signal |
| CN103168412A (en) * | 2010-11-02 | 2013-06-19 | 爱德万测试(新加坡)私人有限公司 | Power supply noise reduction circuit and power supply noise reduction method |
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| JP2013223389A (en) * | 2012-04-19 | 2013-10-28 | Smk Corp | Power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103168412A (en) * | 2010-11-02 | 2013-06-19 | 爱德万测试(新加坡)私人有限公司 | Power supply noise reduction circuit and power supply noise reduction method |
| CN102944250A (en) * | 2012-11-20 | 2013-02-27 | 中国航天科技集团公司第五研究院第五一〇研究所 | Front-end conditioning circuit for measuring high impedance weak signal |
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