CN202696547U - High-frequency signal amplification circuit used for scanning tunnel microscope - Google Patents
High-frequency signal amplification circuit used for scanning tunnel microscope Download PDFInfo
- Publication number
- CN202696547U CN202696547U CN 201220389860 CN201220389860U CN202696547U CN 202696547 U CN202696547 U CN 202696547U CN 201220389860 CN201220389860 CN 201220389860 CN 201220389860 U CN201220389860 U CN 201220389860U CN 202696547 U CN202696547 U CN 202696547U
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- circuit
- scanning tunnel
- tunnel microscope
- stage amplifier
- frequency signal
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Abstract
The utility model relates to the scanning tunnel microscope technology field of single molecule research equipment. A high-frequency signal amplification circuit used for a scanning tunnel microscope is mainly composed of a scanning tunnel microscope needle point, a frequency divider, an impedance match circuit, a current-voltage converting circuit, a first-stage amplifier and a second-stage amplifier, wherein the scanning tunnel microscope needle point, the frequency divider, the impedance match circuit, the current-voltage converting circuit, the first-stage amplifier and the second-stage amplifier are connected in order. The first-stage amplifier is connected with the current-voltage converting circuit through a coaxial cable. The first-stage amplifier is covered by Faraday. The second-stage amplifier is connected with the first-stage amplifier through a double-shield coaxial cable. The impedance match circuit is an LC oscillation loop mainly composed of an inductor and a capacitor. The impedance match circuit enables impedance of a tunnel to be converted to be 50 ohm. The high-frequency signal amplification circuit is reasonable in design, is capable of obtaining, transmitting and amplifying more than 200MHz high-frequency signals, helps to provide a new method for transmission and amplification of weak high-frequency signals, and is capable of obtaining, transmitting and amplifying high frequency signals such as electron spins on molecules.
Description
Technical field
The utility model relates to the scanning tunnel microscope technical field of single molecule study equipment, particularly a kind of a kind of high-frequency signal amplifying circuit for scanning tunnel microscope of amplifying circuit that obtains the high-frequency signal in the sample molecule can obtain, transmits and amplify the above high-frequency signal of 200MHz.
Background technology
Scanning tunnel microscope is the highly sophisticated device for single molecule study, needle point in the instrument is near sample molecule, by principle of quantum mechanics, can produce tunnelling current between molecule and the needle point, electric current spreads out of by needle point, obtain electric current and analyze, shape characteristic, the electricity that can be used for the research molecule be led effect, magnetic etc.But, because joint place, tunnel is that the impedance between needle point and the sample molecule is very large, can produce reflection to high-frequency signal and cause distortion, the low frequency signal on the molecule can only be obtained and transmit to present scanning tunnel microscope, and some faint high-frequency signals can't obtain on the molecule.Want to study the physical propertys such as electron spin of individual molecule, just must reequip scanning tunnel microscope, can obtain, transmit and amplify the above high-frequency signal of 200MHz, described a kind of high-frequency signal amplifying circuit for scanning tunnel microscope can address this problem.
Summary of the invention
In order to address the above problem, a kind of high-frequency signal amplifying circuit for scanning tunnel microscope of the utility model passes through the termination match circuit, the impedance that tunnel joint place is very large, be needle point with sample molecule between very large impedance conversion become 50 ohm, a kind of amplifier that can obtain, transmit and amplify the above high-frequency signal of 200MHz is provided.
The technical scheme that the utility model adopts is:
A kind of high-frequency signal amplifying circuit for scanning tunnel microscope mainly is comprised of needle tip of scanning tunnel microscope, frequency divider, impedance matching circuit, current-voltage conversion circuit, first order amplifier and second level amplifier, described needle tip of scanning tunnel microscope, frequency divider, impedance matching circuit, current-voltage conversion circuit, first order amplifier are connected successively with second level amplifier, described first order amplifier is connected with described current-voltage conversion circuit by coaxial cable, described first order amplifier shrouds with faraday, disturbs with the shielding outer signals; Described second level amplifier is connected with described first order amplifier by double shielded coaxial cable; Described impedance matching circuit is the LC oscillation circuit that mainly is comprised of inductance, electric capacity, described impedance matching circuit can become 50 ohm with the impedance conversion of tunnel joint, identical with the input impedance of first order amplifier, reach the effect of coupling, reduced high-frequency signal reflection distortion, described LC concussion loop is welded on the printed circuit board; Described current-voltage conversion circuit mainly is made of the coil that is wrapped on the polyrod.
The beneficial effects of the utility model are:
A kind of high-frequency signal Design of Amplification Circuit for scanning tunnel microscope is reasonable, described impedance matching circuit can become 50 ohm with the impedance conversion of tunnel joint, reduced high-frequency signal reflection distortion, a kind of amplifying circuit that can obtain, transmit and amplify the above high-frequency signal of 200MHz is provided, be a kind of new method of transmitting and amplifying faint high-frequency signal, can obtain the high frequency signals such as electron spin and transmission and amplification on the individual molecule.
Description of drawings
Further specify below in conjunction with figure of the present utility model:
Fig. 1 is described a kind of high-frequency signal amplifying circuit schematic diagram for scanning tunnel microscope.
Among the figure, 1. sample, 2. needle tip of scanning tunnel microscope, 3. frequency divider, 4. impedance matching circuit, 5. current-voltage conversion circuit, 6. coaxial cable, 7. Faraday cage, 8. first order amplifier, 9. double shielded coaxial cable, 10. second level amplifier, 11. low frequency feedback circuits.
Embodiment
A kind of high-frequency signal amplifying circuit schematic diagram for scanning tunnel microscope as described in such as Fig. 1 being, mainly by needle tip of scanning tunnel microscope (2), frequency divider (3), impedance matching circuit (4), current-voltage conversion circuit (5), first order amplifier (8) forms with second level amplifier (10), described needle tip of scanning tunnel microscope (2), frequency divider (3), impedance matching circuit (4), current-voltage conversion circuit (5), first order amplifier (8) is connected successively with second level amplifier (10), described first order amplifier (8) is connected with described current-voltage conversion circuit (5) by coaxial cable (6), described first order amplifier (8) covers with Faraday cage (7), disturbs with the shielding outer signals; Described second level amplifier (10) is connected with described first order amplifier (8) by double shielded coaxial cable (9); Described impedance matching circuit (4) is the LC oscillation circuit that mainly is comprised of inductance, electric capacity, described impedance matching circuit (4) can become 50 ohm with the impedance conversion of tunnel joint, identical with the input impedance of described first order amplifier (8), reach the effect of coupling, reduced high-frequency signal reflection distortion.
During operation, described needle tip of scanning tunnel microscope (2) moves near sample (1) molecule, produce tunnelling current, electric current is by behind the described frequency divider (3), the low frequency component of described electric current enters described low frequency feedback circuit (11), and low frequency signal is used for the scanning of control needle point.The high fdrequency component of described electric current is converted to 50 ohm by behind the described impedance matching circuit (4) with very large output impedance between the original tunnel joint, and is identical with the input impedance of described first order amplifier (8), reaches the effect of coupling; After described current-voltage conversion circuit (5) is converted into voltage signal with current signal, be input to described first order amplifier (8) by described coaxial cable (6), described first order amplifier (8) places in the described Faraday cage (7), with the impact of the interference of shielding outer signals and stray capacitance; Signal through first order amplifier (8) after, again amplify and export by described double shielded coaxial cable (9) input described second level amplifier (10).
Claims (2)
1. high-frequency signal amplifying circuit that is used for scanning tunnel microscope, mainly by needle tip of scanning tunnel microscope, frequency divider, impedance matching circuit, current-voltage conversion circuit, first order amplifier and second level amplifier form, it is characterized in that: described needle tip of scanning tunnel microscope (2), frequency divider (3), impedance matching circuit (4), current-voltage conversion circuit (5), first order amplifier (8) is connected successively with second level amplifier (10), described first order amplifier (8) is connected with described current-voltage conversion circuit (5) by coaxial cable (6), described first order amplifier (8) covers with Faraday cage (7), and described second level amplifier (10) is connected with described first order amplifier (8) by double shielded coaxial cable (9).
2. described a kind of high-frequency signal amplifying circuit for scanning tunnel microscope according to claim 1, it is characterized in that: described impedance matching circuit (4) is the LC oscillation circuit that mainly is comprised of inductance, electric capacity, and described impedance matching circuit (4) can become 50 ohm with the impedance conversion of tunnel joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220389860 CN202696547U (en) | 2012-07-31 | 2012-07-31 | High-frequency signal amplification circuit used for scanning tunnel microscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220389860 CN202696547U (en) | 2012-07-31 | 2012-07-31 | High-frequency signal amplification circuit used for scanning tunnel microscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202696547U true CN202696547U (en) | 2013-01-23 |
Family
ID=47552099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220389860 Expired - Fee Related CN202696547U (en) | 2012-07-31 | 2012-07-31 | High-frequency signal amplification circuit used for scanning tunnel microscope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202696547U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820858A (en) * | 2012-07-31 | 2012-12-12 | 赵烨梁 | High-frequency signal amplifying circuit for scanning tunnel microscope |
| CN106725464A (en) * | 2017-01-05 | 2017-05-31 | 中国科学院电子学研究所 | Detect the dry electrode system of EEG signals |
| CN106849887A (en) * | 2017-02-28 | 2017-06-13 | 河南师范大学 | Put before a kind of tunnel knot paraller resistanc method PSTM high bandwidth |
-
2012
- 2012-07-31 CN CN 201220389860 patent/CN202696547U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820858A (en) * | 2012-07-31 | 2012-12-12 | 赵烨梁 | High-frequency signal amplifying circuit for scanning tunnel microscope |
| CN106725464A (en) * | 2017-01-05 | 2017-05-31 | 中国科学院电子学研究所 | Detect the dry electrode system of EEG signals |
| CN106849887A (en) * | 2017-02-28 | 2017-06-13 | 河南师范大学 | Put before a kind of tunnel knot paraller resistanc method PSTM high bandwidth |
| CN106849887B (en) * | 2017-02-28 | 2024-03-22 | 河南师范大学 | High-bandwidth front-end of tunnel junction parallel resistance scanning tunnel microscope |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20130731 |