CN201536350U - Low noise wideband pre-amplifier - Google Patents
Low noise wideband pre-amplifier Download PDFInfo
- Publication number
- CN201536350U CN201536350U CN2009200338173U CN200920033817U CN201536350U CN 201536350 U CN201536350 U CN 201536350U CN 2009200338173 U CN2009200338173 U CN 2009200338173U CN 200920033817 U CN200920033817 U CN 200920033817U CN 201536350 U CN201536350 U CN 201536350U
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- low noise
- operational amplifier
- integrated operational
- amplifier
- broadband preamplifier
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Abstract
The utility model relates to a low noise wideband pre-amplifier which comprises an impedance matching circuit, an over-voltage protection circuit and an amplifying circuit; and the amplifying circuit comprises an integrated operational amplifier and a feedback resistor, wherein, the integrated operational amplifier adopts a low-noise and high wideband voltage feedback integrated operational amplifier or a low-noise high wideband current feedback integrated operational amplifier. The utility model solves the problems of low noise wideband pre-amplifier in the prior art that when weak signals are detected, amplification is distorted easily and when strong signals pass, the pre-amplifier is destroyed easily because of the lack of over-voltage protection. The utility model prevents weak signals from being distorted, protects the pre-amplifier from being burnt out when strong signals pass, and has the advantages of low cost and the like.
Description
Technical field
The utility model relates to a kind of low noise broadband preamplifier, is applicable to the measurement of fast pulse ray physics and other small-signal.
Background technology
Often use low noise broadband preamplifier to amplify small-signal in the physical measurement of existing pulse ray.At present domestic and international many mechanisms all carried out relevant research, and many corresponding products are also arranged, the DHPCA-100 current amplifier of the variable gain of the Femto company that often uses for example, its highest 200MHz of bandwidth; Adopt the alternating current-direct current coupled modes; Gain Adjustable; Input noise 500pA/ √ Hz.
But all there is such defective in amplifier in the market: one, existing amplifier background noise when amplifying the following signal of 10mV is bigger, can not satisfy our requirement for faint measured signal.Two, the overvoltage crowbar that lacks of existing amplifier often is damaged by large-signal the time.
Summary of the invention
For solve low noise broadband preamplifier in the prior art amplify easy distortion when the test small-signal and lack overvoltage protection again with strong signal by the time problem of damage easily, the utility model provides a kind of low noise broadband preamplifier that makes the undistorted amplification of small-signal, overvoltage protection.
Technical solution of the present utility model:
A kind of low noise broadband preamplifier; its special character is: it comprises impedance matching circuit, overvoltage crowbar and the amplifying circuit that connects successively; described amplifying circuit comprises integrated operational amplifier A and feedback resistance R5, and described integrated operational amplifier A is low noise high bandwidth Voltage Feedback integrated operational amplifier or low noise high bandwidth current feedback integrated operational amplifier.
Above-mentioned integrated operational amplifier A is integrated transporting discharging AD8099.
Above-mentioned low noise broadband preamplifier also comprises bias set circuti, described bias set circuti comprise bias supply (+VCC/-VCC), semifixed resistor Rw and roughly adjusted rheostat R2, termination integrated operational amplifier A positive input after described semifixed resistor Rw and the roughly adjusted rheostat R2 series connection, another termination bias supply (+VCC/-VCC).
Above-mentioned overvoltage crowbar is the diode D that is attempted by input amplifier.
Above-mentioned diode D is switching diode MIMA141KT1-D.
Above-mentioned impedance matching circuit comprises the input build-out resistor R1 that is attempted by integrated operational amplifier A positive input.
Above-mentioned impedance matching circuit comprises the output build-out resistor R3 that is serially connected in integrated operational amplifier A output.
Above-mentioned amplifying circuit comprises the frequency compensation capacitor C 1 in parallel with feedback resistance R5.
The advantage that the utility model had:
1, the amplifying stage of amplifying circuit of the present utility model adopts low noise high bandwidth voltage or current feedback integrated transporting discharging, and the minimum signal that amplifier amplifies can reach 250 μ V, and small-signal is undistorted.
2, the utility model can bear the overvoltage protection that amplitude surpasses 50V at the input of amplifying circuit and connect diode, prevented large-signal by the time phenomenon that burns out.
3, all components and parts costs of the present utility model are low.
4, the utility model has increased bias set circuti, makes amplifier be output as zero when no input signal.
5, the utility model frequency compensation capacitor C 1 in parallel on feedback resistance R5 has improved the frequency band of amplifier.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model low noise broadband preamplifier.
Fig. 2 is the circuit theory diagrams of the utility model low noise broadband preamplifier.
Reference numeral: U1-bias set circuti; the U2-overvoltage crowbar, the U3-amplifying circuit, R1-imports build-out resistor; the R2-roughly adjusted rheostat; R3-exports build-out resistor, and R4-amplifies resistance, R5-feedback resistance, R6-resistance; the Rw-semifixed resistor; C1-frequency compensation electric capacity, C2-electric capacity, A-integrated operational amplifier.
Embodiment
Figure 1 shows that the schematic block circuit diagram of low noise broadband preamplifier, comprise
Bias set circuti,Impedance matching circuit, overvoltage crowbar and amplifying circuit, impedance matching circuit comprise input build-out resistor R1 and output build-out resistor R3.
Figure 2 shows that the schematic block circuit diagram of low noise broadband preamplifier.Amplifying circuit comprises integrated operational amplifier A, feedback resistance R5, the frequency compensation capacitor C 1 in parallel with feedback resistance R5.
In order to finish the undistorted amplification to small-signal, the integrated operational amplifier A of amplifying circuit adopts low noise high bandwidth voltage or current feedback integrated transporting discharging, preferred low-noise high bandwidth Voltage Feedback integrated transporting discharging AD8099.
Bias set circuti comprise bias supply (+VCC/-VCC), semifixed resistor Rw and roughly adjusted rheostat R2, termination integrated operational amplifier A positive input after semifixed resistor Rw and the roughly adjusted rheostat R2 series connection, another termination bias supply (+VCC/-VCC), regulate resistance R 2 and be used for coarse adjustment, its value is about 100k Ω; Semifixed resistor Rw is used for fine setting, and its value is about 10k Ω.Regulate resistance R 2 and semifixed resistor Rw and form bias set circuti, make amplifier when no input signal, be output as zero.During debugging, if during overvoltage crowbar output signal generation forward bias, bias supply meets negative supply-VCC, if during the biasing of protector output signal generation negative sense, bias supply meets positive supply VCC.
In order to make amplifier not cause damage because of the impact of overvoltage signal; guarantee the safety of amplifier and do not influence measured signal; at the input of amplifying circuit and be connected to switching diode MIMA141KT1-D as overvoltage crowbar; it utilizes the switching characteristic of fast recovery diode; when input signal is big; the conducting of protection diode forward, and be clamped at the forward conduction pressure, thus the amplifier of the amplifying circuit of protection back is not damaged by big voltage.
For in input during small-signal, the input impedance of integrated operational amplifier does not produce reflection to circuit, at integrated operational amplifier A positive input and meet input build-out resistor R1, at integrated operational amplifier A output serial connection output build-out resistor R3.Build-out resistor R1 is in parallel with protection tube D in input, when input signal less and when protective effect not taking place, the input impedance of whole amplifier and the impedance phase of measuring circuit are mated.The characteristic impedance of coaxial cable slotted line has the branch of 50 Ω and 75 Ω, is generally 50 Ω, and input build-out resistor R1 also selects 50 Ω usually for use.
In order to improve the frequency band of amplifier, frequency compensation capacitor C 1 in parallel on feedback resistance R5.
Claims (8)
1. low noise broadband preamplifier; it is characterized in that: it comprises impedance matching circuit, overvoltage crowbar and the amplifying circuit that connects successively; described amplifying circuit comprises integrated operational amplifier (A) and feedback resistance (R5), and described integrated operational amplifier (A) is low noise high bandwidth Voltage Feedback integrated operational amplifier or low noise high bandwidth current feedback integrated operational amplifier.
2. low noise according to claim 1 broadband preamplifier is characterized in that: described integrated operational amplifier (A) is integrated transporting discharging AD8099.
3. low noise according to claim 1 and 2 broadband preamplifier, it is characterized in that: described low noise broadband preamplifier also comprises bias set circuti, described bias set circuti comprise bias supply (+VCC/-VCC), semifixed resistor (Rw) and roughly adjusted rheostat (R2), termination integrated operational amplifier (A) positive input after described semifixed resistor (Rw) and roughly adjusted rheostat (R2) series connection, another termination bias supply (+VCC/-VCC).
4. low noise according to claim 3 broadband preamplifier is characterized in that: described overvoltage crowbar is the diode (D) that is attempted by input amplifier.
5. low noise according to claim 4 broadband preamplifier is characterized in that: described diode (D) is switching diode MIMA141KT1-D.
6. low noise according to claim 3 broadband preamplifier is characterized in that: described impedance matching circuit comprises the input build-out resistor (R1) that is attempted by integrated operational amplifier (A) positive input.
7. low noise according to claim 6 broadband preamplifier is characterized in that: described impedance matching circuit comprises the output build-out resistor (R3) that is serially connected in integrated operational amplifier (A) output.
8. low noise according to claim 3 broadband preamplifier is characterized in that: described amplifying circuit comprises the frequency compensation electric capacity (C1) in parallel with feedback resistance (R5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200338173U CN201536350U (en) | 2009-07-07 | 2009-07-07 | Low noise wideband pre-amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200338173U CN201536350U (en) | 2009-07-07 | 2009-07-07 | Low noise wideband pre-amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201536350U true CN201536350U (en) | 2010-07-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200338173U Expired - Lifetime CN201536350U (en) | 2009-07-07 | 2009-07-07 | Low noise wideband pre-amplifier |
Country Status (1)
| Country | Link |
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| CN (1) | CN201536350U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394609A (en) * | 2011-10-25 | 2012-03-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Spike pulse voltage amplifier |
| CN103023441A (en) * | 2012-12-06 | 2013-04-03 | 北京中科汉天下电子技术有限公司 | Bandwidth regulating method for radio frequency power amplifier and radio frequency power amplifier |
| CN103888084A (en) * | 2014-03-25 | 2014-06-25 | 中国科学院空间科学与应用研究中心 | Integrated pre-amplifier used for charged particle detector |
| CN104734001A (en) * | 2015-03-30 | 2015-06-24 | 中国科学院微电子研究所 | Narrow pulse driving circuit |
| CN104931996A (en) * | 2015-06-12 | 2015-09-23 | 西北核技术研究所 | Signal conditioning system of large-dynamic short pulses in radiation detection |
| CN108737932A (en) * | 2018-05-23 | 2018-11-02 | 努比亚技术有限公司 | Terminal anti-utter long and high-pitched sounds method, terminal and computer readable storage medium |
| CN109861647A (en) * | 2017-11-30 | 2019-06-07 | 北京汇冠触摸技术有限公司 | A kind of low noise high-precision amplification circuit |
-
2009
- 2009-07-07 CN CN2009200338173U patent/CN201536350U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394609A (en) * | 2011-10-25 | 2012-03-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Spike pulse voltage amplifier |
| CN102394609B (en) * | 2011-10-25 | 2014-06-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Spike pulse voltage amplifier |
| CN103023441A (en) * | 2012-12-06 | 2013-04-03 | 北京中科汉天下电子技术有限公司 | Bandwidth regulating method for radio frequency power amplifier and radio frequency power amplifier |
| CN103888084A (en) * | 2014-03-25 | 2014-06-25 | 中国科学院空间科学与应用研究中心 | Integrated pre-amplifier used for charged particle detector |
| CN103888084B (en) * | 2014-03-25 | 2016-08-24 | 中国科学院空间科学与应用研究中心 | A kind of integrated preamplifier for charged particle detector |
| CN104734001A (en) * | 2015-03-30 | 2015-06-24 | 中国科学院微电子研究所 | Narrow pulse driving circuit |
| CN104931996A (en) * | 2015-06-12 | 2015-09-23 | 西北核技术研究所 | Signal conditioning system of large-dynamic short pulses in radiation detection |
| CN104931996B (en) * | 2015-06-12 | 2018-06-19 | 西北核技术研究所 | The signal condition system of Larger Dynamic fast pulse in radiation detection |
| CN109861647A (en) * | 2017-11-30 | 2019-06-07 | 北京汇冠触摸技术有限公司 | A kind of low noise high-precision amplification circuit |
| CN108737932A (en) * | 2018-05-23 | 2018-11-02 | 努比亚技术有限公司 | Terminal anti-utter long and high-pitched sounds method, terminal and computer readable storage medium |
| CN108737932B (en) * | 2018-05-23 | 2021-03-26 | 努比亚技术有限公司 | Terminal squeaking prevention method, terminal and computer readable storage medium |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100728 |
|
| CX01 | Expiry of patent term |