CN207070022U - The amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier - Google Patents
The amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier Download PDFInfo
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- CN207070022U CN207070022U CN201721095136.0U CN201721095136U CN207070022U CN 207070022 U CN207070022 U CN 207070022U CN 201721095136 U CN201721095136 U CN 201721095136U CN 207070022 U CN207070022 U CN 207070022U
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- 230000005764 inhibitory process Effects 0.000 title claims abstract description 17
- 238000012421 spiking Methods 0.000 claims abstract description 7
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- 230000003321 amplification Effects 0.000 description 10
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
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Abstract
A kind of amplifying circuit that high-frequency signal common mode inhibition is realized based on Current feedback amplifier, it is made up of the cascade of n levels magnifier, wherein, n >=1, the magnifier per one-level forms by two current feedback type op amplifiers, current feedback type op amplifier B1 input in the same direction connection spiking source, current feedback type op amplifier A1 input in the same direction connection avalanche signal source (avalanche signal can be superimposed upon on spike signal), current feedback type op amplifier An output end and current feedback type op amplifier Bn output end connect two inputs of a radio-frequency transformer T respectively.The utility model solves the technological deficiency that high difference mode gain can not be realized using radio frequency amplifier, has the characteristics of common-mode rejection ratio is high；Its high bandwidth characteristic meets the requirement of high frequency signals, solves the problems, such as, because Current feedback gain is limited, also to have reached the purpose for realizing that avalanche signal is screened in high precision by the way of cascaded gain.
Description
Technical field
The high speed analog signal modulate circuit technical field of single-photon detector is the utility model is related to, it is more particularly to a kind of
The amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier.
Background technology
In quantum key distribution system (QKD), the dark count rate of the single-photon detector based on avalanche diode, rear arteries and veins
Rush performance of the parameters such as counting rate and dead time both limited by avalanche signal modulate circuit.Due under gating patterns, gating
Signal is coupled in signal path by avalanche diode junction capacity, and so as to produce spike, its amplitude is avalanche signal
Tens times；The modulate circuit of avalanche signal is while avalanche signal is amplified, it is necessary to suppress to spike, after guarantee
Examination of the terminal circuit to sufficiently small avalanche signal.A kind of method often used, it is to produce a consistent spike signal,
Differential amplification is carried out with avalanche diode output signal, spike is subjected to common mode inhibition, to obtain avalanche signal.
Spike and avalanche signal are high-frequency signal, while signal amplifies, and eliminate common-mode signal, only with
Radio frequency amplifier can not be completed.Need to design the differential amplifier circuit that common-mode rejection ratio is higher than 40dB.But enter in RF application
The first power of row subtracts each other, then the method for radio frequency amplification, and the frequency characteristic of its gain is by discrete parameter strong influence, it is impossible to reaches
The requirement of common mode inhibition, and first carry out radio frequency amplification and subtract each other again, due to limitation of the common-mode signal to dynamic range, it is impossible to reach high
The requirement of difference mode gain.
Utility model content
The utility model purpose is to provide a kind of realizes putting for high-frequency signal common mode inhibition based on Current feedback amplifier
Big circuit, use the magnifier of tandem type using substitute radio frequency amplifying circuit as single-photon detector output signal
Modulate circuit, the amplification of large gain can be carried out to avalanche signal, and eliminate the spike as common-mode signal, reach realization snow
Collapse the technique effect of signal high precision examination.
What the technical solution of the utility model was realized in：
A kind of amplifying circuit that high-frequency signal common mode inhibition is realized based on Current feedback amplifier, electricity is amplified by n levels instrument
Road cascade is formed, wherein, n >=1, the magnifier per one-level is by two current feedback type op amplifier groups
Into reverse input end and the output end of the current feedback type op amplifier are connected with feedback resistance Rf, the same one-level instrument
The reverse input end of two current feedback type op amplifiers of table amplifying circuit is connected by gain resistor Rg and electric capacity Cg
Connect, first order magnifier includes current feedback type op amplifier A1, current feedback type op amplifier B1, the electricity
Regenerative operation amplifier B1 input in the same direction connection spiking source is flowed, the current feedback type op amplifier A1's is same
Include current feedback type op with avalanche signal source, the afterbody magnifier to input connection spiking source
Amplifier An, current feedback type op amplifier Bn, the current feedback type op amplifier An output end and electric current are anti-
Feedback formula operational amplifier Bn output end connects two inputs of a radio-frequency transformer T respectively.
Preferably, the amplifying circuit is made up of the cascade of three-level magnifier.
Preferably, the current feedback type op amplifier uses OPA695, THS3202 or THS4304.
Compared with prior art, the utility model has following beneficial effect：
The amplifying circuit of the present utility model that high-frequency signal common mode inhibition is realized based on Current feedback amplifier, is solved and adopted
The elimination to common-mode signal can not be completed with radio frequency amplifier, and using differential amplification electricity of the common-mode rejection ratio higher than 40dB
Road, the frequency characteristic of its gain is by discrete parameter strong influence, it is impossible to the defects of reaching the requirement of common mode inhibition, this practicality
It is new to realize that the differential mode of high-frequency signal amplifies using magnifier structure, radio frequency amplification is compared, has common-mode rejection ratio high
The characteristics of；Using current feedback type op amplifier as the element in magnifier knot, voltage feedback is compared
Operational amplifier, its high bandwidth characteristic meet the requirement of high frequency signals, meanwhile, solved by the way of cascaded gain
Due to Current feedback gain it is limited the problem of, high-frequency signal is amplified using current feedback type op amplifier, its frequency
Rate stability of characteristics, bandwidth are solely dependent upon feedback resistance, in addition, the utility model is again cut common-mode signal using the amplification of first differential mode
The effective suppression common mode signal of method and noise, while spike as common-mode signal is eliminated, also reached realization
The purpose that avalanche signal is screened in high precision.
Brief description of the drawings
Fig. 1 is the circuit for the amplifying circuit that the utility model realizes high-frequency signal common mode inhibition based on Current feedback amplifier
Figure.
In figure：Magnifier 100, current feedback type op amplifier 110.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the utility model is clearly and completely described.
As shown in figure 1, a kind of amplifying circuit that high-frequency signal common mode inhibition is realized based on Current feedback amplifier, by n levels
The cascade of magnifier 100 is formed, wherein, n >=1, the magnifier 100 per one-level is by two current feedbacks
Formula operational amplifier 110 is composed in parallel, and the reverse input end of the current feedback type op amplifier 110 is connected with output end
Feedback resistance Rf, the reverse input end of two current feedback type op amplifiers 110 of the same one-level magnifier 100
By gain resistor Rg and electric capacity Cg connections, first order magnifier include current feedback type op amplifier A1,
Current feedback type op amplifier B1, the current feedback type op amplifier B1 input in the same direction connection spiking source,
Input in the same direction connection spiking source and avalanche signal source, the afterbody of the current feedback type op amplifier A1
Magnifier 100 includes current feedback type op amplifier An, current feedback type op amplifier Bn, the current feedback
Formula operational amplifier A n output end and current feedback type op amplifier Bn output end connect a radio-frequency transformer T respectively
Two inputs.Yield value wherein at different levels is determined that feedback resistance Rf/ gains are electric by feedback resistance Rf/ gain resistors Rg value
The ratio range for hindering Rg is depended in bandwidth and the suitable scope of gain.
In the instrument structure for amplifying, n-th grade of output voltage is represented by with input voltage relation：
(n+1)th grade of input voltage is represented by with n-th grade of output voltage relation：
After iterative calculation：
First order input is represented by：
3rd level exports to be represented by with S1, S2 relation：
The tandem type magnifier, only the avalanche signal as difference mode signal is amplified, not to conduct
The spike signal of common-mode signal is amplified
The output stage is by 1:1 radio-frequency transformer is formed, and such as Fig. 1 connected modes, realizes subtracting each other for A3 and B3 signals, therefore
Output end signal is：
Uo=(8k3-4k2-2k)S2
Wherein：U is signal voltage, K=Rf/Rg, S '1For S1Pass through junction capacity CcIt is coupled to the spike of input stage, S2
For avalanche signal.
In embodiment of the present utility model, amplifying circuit is made up of the cascade of three-level magnifier 100, current feedback fortune
The bandwidth of amplifier 110 is calculated in more than GHz, using chip：OPA695, THS3202 or THS4304 can reach.Feedback resistance Rf
Resistance is required to determine by current feedback type op amplifier bandwidth, as chosen THS3202 as the electric current in instrument structure for amplifying
Regenerative operation amplifier, bandwidth requirement 1GHz, then feedback resistance Rf resistances are in 280 Ω or so.Gain resistor Rg resistances are by list
Stage gain determines, because the gain of current feedback type op amplifier is limited, the utility model will be set to 10 per one step gain, increase
Beneficial resistance Rg is 56 Ω or so, wherein K=Rf/Rg=280/56 ≈ 3.Electric capacity Cg capacitances choose 10nF, in the utility model institute
In the high-frequency signal bandwidth of processing, its feedback resistance Rf is much smaller than gain resistor Rg, and wherein one step gain is set to 10, three-stage cascade
It is then 1000.
The amplifying circuit of the present utility model that high-frequency signal common mode inhibition is realized based on Current feedback amplifier, is solved and adopted
The elimination to common-mode signal can not be completed with radio frequency amplifier, and using differential amplification electricity of the common-mode rejection ratio higher than 40dB
Road, the frequency characteristic of its gain is by discrete parameter strong influence, it is impossible to the defects of reaching the requirement of common mode inhibition, this practicality
It is new to realize that the differential mode of high-frequency signal amplifies using magnifier structure, radio frequency amplification is compared, has common-mode rejection ratio high
The characteristics of；Using current feedback type op amplifier as the element in magnifier knot, voltage feedback is compared
Operational amplifier, its high bandwidth characteristic meet the requirement of high frequency signals, meanwhile, solved by the way of cascaded gain
Due to Current feedback gain it is limited the problem of, high-frequency signal is amplified using current feedback type op amplifier, its frequency
Rate stability of characteristics, bandwidth are solely dependent upon feedback resistance, in addition, the utility model is again cut common-mode signal using the amplification of first differential mode
The effective suppression common mode signal of method and noise, while spike as common-mode signal is eliminated, also reached realization
The purpose that avalanche signal is screened in high precision.
Claims (3)
1. a kind of amplifying circuit that high-frequency signal common mode inhibition is realized based on Current feedback amplifier, it is characterised in that by n level instrument
The cascade of table amplifying circuit is formed, wherein, n >=1, the magnifier per one-level is put by two current feedback type ops
Big device composition, reverse input end and the output end of the current feedback type op amplifier are connected with feedback resistance Rf, described same
The reverse input end of two current feedback type op amplifiers of one-level magnifier passes through gain resistor Rg and electricity
Holding Cg connections, first order magnifier includes current feedback type op amplifier A1, current feedback type op amplifier B1,
The input in the same direction connection spiking source of the current feedback type op amplifier B1, the current feedback type op amplifier
A1 input in the same direction connection spiking source and avalanche signal source, the afterbody magnifier includes current feedback
Formula operational amplifier A n, current feedback type op amplifier Bn, the output end of the current feedback type op amplifier An and
Current feedback type op amplifier Bn output end connects two inputs of a radio-frequency transformer T respectively.
2. realizing the amplifying circuit of high-frequency signal common mode inhibition based on Current feedback amplifier as claimed in claim 1, it is special
Sign is that the amplifying circuit is made up of the cascade of three-level magnifier.
3. the amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier as claimed in claim 1 or 2, its
It is characterised by, the current feedback type op amplifier uses OPA695, THS3202 or THS4304.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721095136.0U CN207070022U (en) | 2017-08-30 | 2017-08-30 | The amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721095136.0U CN207070022U (en) | 2017-08-30 | 2017-08-30 | The amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier |
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| Publication Number | Publication Date |
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| CN207070022U true CN207070022U (en) | 2018-03-02 |
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| CN201721095136.0U Withdrawn - After Issue CN207070022U (en) | 2017-08-30 | 2017-08-30 | The amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425820A (en) * | 2017-08-30 | 2017-12-01 | 浙江九州量子信息技术股份有限公司 | The amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier |
-
2017
- 2017-08-30 CN CN201721095136.0U patent/CN207070022U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425820A (en) * | 2017-08-30 | 2017-12-01 | 浙江九州量子信息技术股份有限公司 | The amplifying circuit of high-frequency signal common mode inhibition is realized based on Current feedback amplifier |
| CN107425820B (en) * | 2017-08-30 | 2024-02-09 | 浙江九州量子信息技术股份有限公司 | Amplifying circuit for realizing common mode rejection of high-frequency signals based on current feedback type operational amplifier |
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