CN102820858A - High-frequency signal amplifying circuit for scanning tunnel microscope - Google Patents
High-frequency signal amplifying circuit for scanning tunnel microscope Download PDFInfo
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- CN102820858A CN102820858A CN2012102833608A CN201210283360A CN102820858A CN 102820858 A CN102820858 A CN 102820858A CN 2012102833608 A CN2012102833608 A CN 2012102833608A CN 201210283360 A CN201210283360 A CN 201210283360A CN 102820858 A CN102820858 A CN 102820858A
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Abstract
The invention relates to the technical field of a scanning tunnel microscope of single molecule studying equipment. A high-frequency signal amplifying circuit for the scanning tunnel microscope consists of a scanning tunnel microscope pinpoint, a frequency divider, an impedance matching circuit, a current-voltage converting circuit, a first stage amplifier and a second stage amplifier which are sequentially connected, wherein the first stage amplifier is connected with the current-voltage converting circuit through a coaxial cable and is covered by a Faraday cage; the second stage amplifier is connected with the first stage amplifier through a double-shielding coaxial cable; the impedance matching circuit is an LC oscillating circuit mainly comprising an inductor and a capacitor; and the impedance matching circuit can convert the impedance of a tunnel node to 50 ohm. The high-frequency signal amplifying circuit is reasonable in design, can acquire, transmit and amplify a high-frequency signal which is more than 200MHz, is a new method for transmitting and amplifying the weak high-frequency signal, and can acquire, transmit, and amplify high-frequency signals, such as electron spin on a single molecule.
Description
Technical field
The present invention relates to the PSTM technical field of unimolecule research equipment; Particularly a kind of a kind of high-frequency signal amplifying circuit that is used for PSTM 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
PSTM is the highly sophisticated device that is used for unimolecule research; 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 through needle point; Obtain electric current and analyze, shape characteristic, the electricity that can be used to study molecule are led effect, magnetic etc.But; Because joint place, tunnel is that the impedance between needle point and the sample molecule is very big; Can produce reflection to high-frequency signal and cause distortion, present PSTM can only obtain and transmit the low frequency signal on the molecule, 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 PSTM; Make it can obtain, transmit and amplify the above high-frequency signal of 200MHz, said a kind of high-frequency signal amplifying circuit that is used for PSTM can address this problem.
Summary of the invention
In order to address the above problem; A kind of high-frequency signal amplifying circuit that is used for PSTM of the present invention is through inserting impedance matching circuit; The impedance that tunnel joint place is very big, be needle point with sample molecule between very big 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 present invention adopted is:
A kind of high-frequency signal amplifying circuit that is used for PSTM mainly is made up of needle tip of scanning tunnel microscope, frequency divider, impedance matching circuit, current-voltage conversion circuit, first order amplifier and second level amplifier; Said needle tip of scanning tunnel microscope, frequency divider, impedance matching circuit, current-voltage conversion circuit, first order amplifier are connected with second level amplifier successively; Said first order amplifier is connected with said current-voltage conversion circuit through coaxial cable; Said first order amplifier shrouds with faraday, disturbs with the shielding outer signals; Said second level amplifier is connected with said first order amplifier through double shielded coaxial cable; Said impedance matching circuit is the LC oscillation circuit of mainly being made up of inductance, electric capacity; Said 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, said LC concussion loop is welded on the printed circuit board; Said current-voltage conversion circuit mainly is made up of the coil that is wrapped on the polyrod.
The invention has the beneficial effects as follows:
A kind of high-frequency signal amplifying circuit that is used for PSTM is reasonable in design; Said 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, and is a kind of new method of transmitting and amplifying faint high-frequency signal, can obtain 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 invention:
Fig. 1 is said a kind of high-frequency signal amplifying circuit sketch map that is used for PSTM.
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
Like Fig. 1 is said a kind of high-frequency signal amplifying circuit sketch map that is used for PSTM; Mainly form with second level amplifier (10) by needle tip of scanning tunnel microscope (2), frequency divider (3), impedance matching circuit (4), current-voltage conversion circuit (5), first order amplifier (8); Said needle tip of scanning tunnel microscope (2), frequency divider (3), impedance matching circuit (4), current-voltage conversion circuit (5), first order amplifier (8) are connected with second level amplifier (10) successively; Said first order amplifier (8) is connected with said current-voltage conversion circuit (5) through coaxial cable (6); Said first order amplifier (8) covers with Faraday cage (7), disturbs with the shielding outer signals; Said second level amplifier (10) is connected with said first order amplifier (8) through double shielded coaxial cable (9); Said impedance matching circuit (4) is the LC oscillation circuit of mainly being made up of inductance, electric capacity; Said impedance matching circuit (4) can become 50 ohm with the impedance conversion of tunnel joint; Identical with the input impedance of said first order amplifier (8), reach the effect of coupling, reduced high-frequency signal reflection distortion.
During operation; Said needle tip of scanning tunnel microscope (2) moves near sample (1) molecule, produces tunnelling current, and electric current is through behind the said frequency divider (3); The low frequency component of said electric current gets into said low frequency feedback circuit (11), and low frequency signal is used to control the scanning of needle point.The high fdrequency component of said electric current converts very big output impedance between the original tunnel joint into 50 ohm through behind the said impedance matching circuit (4), and is identical with the input impedance of said first order amplifier (8), reaches the effect of coupling; After said current-voltage conversion circuit (5) is converted into voltage signal with current signal; Be input to said first order amplifier (8) through said coaxial cable (6); Said first order amplifier (8) places in the said Faraday cage (7), with the influence of interference of shielding outer signals and stray capacitance; Signal through first order amplifier (8) after, amplify once more and export through said double shielded coaxial cable (9) input said second level amplifier (10).
Claims (2)
1. high-frequency signal amplifying circuit that is used for PSTM; Mainly form by needle tip of scanning tunnel microscope, frequency divider, impedance matching circuit, current-voltage conversion circuit, first order amplifier and second level amplifier; It is characterized in that: said needle tip of scanning tunnel microscope (2), frequency divider (3), impedance matching circuit (4), current-voltage conversion circuit (5), first order amplifier (8) are connected with second level amplifier (10) successively; Said first order amplifier (8) is connected with said current-voltage conversion circuit (5) through coaxial cable (6); Said first order amplifier (8) covers with Faraday cage (7), and said second level amplifier (10) is connected with said first order amplifier (8) through double shielded coaxial cable (9).
2. according to the said a kind of high-frequency signal amplifying circuit that is used for PSTM of claim 1; It is characterized in that: said impedance matching circuit (4) is the LC oscillation circuit of mainly being made up of inductance, electric capacity, and said 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 |
|---|---|---|---|
| CN2012102833608A CN102820858A (en) | 2012-07-31 | 2012-07-31 | High-frequency signal amplifying circuit for scanning tunnel microscope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102833608A CN102820858A (en) | 2012-07-31 | 2012-07-31 | High-frequency signal amplifying circuit for scanning tunnel microscope |
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| CN102820858A true CN102820858A (en) | 2012-12-12 |
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| CN2012102833608A Pending CN102820858A (en) | 2012-07-31 | 2012-07-31 | High-frequency signal amplifying circuit for scanning tunnel microscope |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2273080Y (en) * | 1996-10-21 | 1998-01-21 | 余伯利 | High-frequency wide-band amplifier for indoor special cable TV |
| CN2392189Y (en) * | 1999-11-10 | 2000-08-16 | 中国科学院金属研究所 | Scanning channel telscope work function information imaging device |
| CN2487155Y (en) * | 2001-07-12 | 2002-04-17 | 沈国泰 | Photoelectric multiplexing tube weak pulse signal processing circuit |
| CN101308080A (en) * | 2008-06-12 | 2008-11-19 | 北京航空航天大学 | Data acquisition processing system applies to atomic force microscope |
| CN101465618A (en) * | 2007-12-19 | 2009-06-24 | 中国科学院微电子研究所 | Ultra-wideband low-noise amplifier with double input paths |
| CN101997489A (en) * | 2010-10-15 | 2011-03-30 | 中兴通讯股份有限公司 | Amplifier and implementation method thereof |
| CN202696547U (en) * | 2012-07-31 | 2013-01-23 | 赵烨梁 | High-frequency signal amplification circuit used for scanning tunnel microscope |
-
2012
- 2012-07-31 CN CN2012102833608A patent/CN102820858A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2273080Y (en) * | 1996-10-21 | 1998-01-21 | 余伯利 | High-frequency wide-band amplifier for indoor special cable TV |
| CN2392189Y (en) * | 1999-11-10 | 2000-08-16 | 中国科学院金属研究所 | Scanning channel telscope work function information imaging device |
| CN2487155Y (en) * | 2001-07-12 | 2002-04-17 | 沈国泰 | Photoelectric multiplexing tube weak pulse signal processing circuit |
| CN101465618A (en) * | 2007-12-19 | 2009-06-24 | 中国科学院微电子研究所 | Ultra-wideband low-noise amplifier with double input paths |
| CN101308080A (en) * | 2008-06-12 | 2008-11-19 | 北京航空航天大学 | Data acquisition processing system applies to atomic force microscope |
| CN101997489A (en) * | 2010-10-15 | 2011-03-30 | 中兴通讯股份有限公司 | Amplifier and implementation method thereof |
| CN202696547U (en) * | 2012-07-31 | 2013-01-23 | 赵烨梁 | High-frequency signal amplification circuit used for scanning tunnel microscope |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Application publication date: 20121212 |