CN207472431U - Realize the passive network module that the spike of GHz single-photon detectors inhibits - Google Patents
Realize the passive network module that the spike of GHz single-photon detectors inhibits Download PDFInfo
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- CN207472431U CN207472431U CN201721438343.1U CN201721438343U CN207472431U CN 207472431 U CN207472431 U CN 207472431U CN 201721438343 U CN201721438343 U CN 201721438343U CN 207472431 U CN207472431 U CN 207472431U
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Abstract
The utility model discloses a kind of passive network modules realized the spike of GHz single-photon detectors and inhibited, using balanced unbalanced transformer, Length discrepancy delay line and the cascade mode of power combiner inhibit the spike in signal, due to above-mentioned balanced unbalanced transformer, Length discrepancy delay line and power combiner can be made of metal routing, so each module is realized by pcb board upward wiring form, compared in the prior art using independent modular unit, its impedance matching effect is good, save the space of modules unit installation, reduce the high cost of each standalone module；The passive network module essence is one piece of PCB unit simultaneously, easy to manufacture.
Description
Technical field
The utility model is related to the signal conditioning circuit technical field of single-photon detector, more particularly to a kind of realization GHz
The passive network module that single-photon detector spike inhibits.
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 to by avalanche diode junction capacity in signal path, and so as to generate spike, amplitude is avalanche signal
Tens times；The modulate circuit of avalanche signal needs to inhibit spike, after guarantee while avalanche signal is amplified
Examination of the terminal circuit to sufficiently small avalanche signal.
Such as Fig. 1, at present, spike is carried out in process of inhibition being to export two-way amplitude using independent power splitter module
Signal equal, phase is identical carries out common-mode signal (spike noise) to two paths of signals using independent difference amplifier and inhibits,
Difference mode signal (avalanche signal) is amplified, the avalanche signal then amplified, and system needs to install independent work(point
The devices such as device and difference amplifier, there are impedance matching effect is poor, module installation occupies larger space and cost is higher
The shortcomings that.
Utility model content
The utility model aim is to provide a kind of passive network mould realized the spike of GHz single-photon detectors and inhibited
Block, to solve in the prior art to extract avalanche signal processing during system need to install independent power splitter and
The devices such as difference amplifier, there are the shortcomings that impedance matching effect is poor, module installation occupancy larger space and cost is higher
Technique effect.
What the technical solution of the utility model was realized in：
A kind of passive network module realized the spike of GHz single-photon detectors and inhibited, including：
Balanced-unbalanced transformer, for by input signal work(point, the two paths of signals amplitude after work(point is equal and phase phase
Poor 180 °, the balanced-unbalanced transformer includes multistage capacitive coupling transmission line, all the way signal input part and two paths of signals
Output terminal；
Signal delay unit, for the two paths of signals delay after the work(point to be differed a cycle, the signal delay
Unit uses two-way Length discrepancy delay line；
Power combing unit, power combiner can be used in the power combing unit, after being synthesized by power combiner, makees
Spike to be repeated cyclically is suppressed, and the avalanche signal occurred at random is retained,
The multistage capacitive coupling transmission line of the balanced-unbalanced transformer and the two-way Length discrepancy of signal delay unit
Using being realized in pcb board upward wiring mode, the power combiner is combined by resistance-type in pcb board upward wiring reality delay line
It is existing, the balanced-unbalanced transformer output terminal connection signal delay cell, the output terminal connection work(of the signal delay unit
Rate synthesis unit.
Preferably, the multistage capacitive coupling transmission line is realized using seven grades of capacitive coupling transmission lines.
Preferably, the two-way Length discrepancy delay line is realized by curved in pcb board upward wiring.
Compared with prior art, the utility model has following advantageous effect：
The passive network module realized GHz single-photon detectors spikes and inhibited of the utility model, using balance-no
Balance converter, Length discrepancy delay line and the cascade mode of power combiner inhibit the spike in signal, by
It can be made of in above-mentioned balanced-unbalanced transformer, Length discrepancy delay line and power combiner metal routing, so each mould
Block is realized by pcb board upward wiring form, compared in the prior art using independent modular unit, impedance matching effect
It is good, the space of modules unit installation is saved, reduces the high cost of each standalone module；The passive network mould simultaneously
Block essence is one piece of PCB unit, easy to manufacture.
Description of the drawings
Fig. 1 is the output signal conditioning circuit schematic diagram of single-photon detector in the prior art；
Fig. 2 is that the passive network modular structure that the realization GHz single-photon detectors spike of the utility model inhibits is shown
It is intended to.
In figure：Balanced-unbalanced transformer 100, capacitive coupling transmission line 101, signal input part 102, signal are defeated all the way
Outlet 103, signal delay unit 200, Length discrepancy delay line 201, power combing unit 300, using power combiner 301.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the utility model is clearly and completely described.
As shown in Fig. 2, a kind of passive network module realized the spike of GHz single-photon detectors and inhibited, including：It is flat
Weighing apparatus-balun 100, for input signal work(to be divided, the two paths of signals amplitude after work(point is equal and phase differs 180 °,
The balanced-unbalanced transformer 100 includes multistage capacitive coupling transmission line 101, all the way signal input part 102 and two-way
Signal output end 103；
Signal delay unit 200, for by the two paths of signals delay difference a cycle after the work(point, the signal to prolong
Slow unit is using two-way Length discrepancy delay line 201, and the two-way Length discrepancy delay line 201 is by curved in pcb board upward wiring reality
It is existing；
Power combing unit 300, the power combing unit 300 can be used power combiner 301, pass through power combiner
After 301 synthesis, it is suppressed as the spike being repeated cyclically, the avalanche signal occurred at random is retained,
The multistage capacitive coupling transmission line 101 of the balanced-unbalanced transformer 100 and signal delay unit 200
Using being realized in pcb board upward wiring mode, the power combiner 301 is closed two-way Length discrepancy delay line equal 201 by resistance-type
Road is in the realization of pcb board upward wiring, the 100 output terminal connection signal delay cell 200 of balanced-unbalanced transformer, the letter
The output terminal connection power combing unit 300 of number delay cell 200.
Embodiment
The three parts of the passive network module are realized by PCB trace, wherein balanced-unbalanced transformer 100 by
Seven grades of capacitive coupling transmission lines 101 realize that Length discrepancy delay line 201 is realized by snakelike cabling, and power combiner 301 then passes through
Resistance-type combining cabling is realized.
The passive network module cabling is controlled using 50 ohmages, preferably realizes impedance matching, anti-stop signal
Reflection distortion.
The passive network module operation principle：Avalanche signal and spike noise signal enter balance-injustice together
The uneven end of weighing apparatus converter 100, is exported by two-way balance end, and amplitude is equal, and phase differs 180 °；Length discrepancy delay line
201 cause in-phase end signal compared with reverse side delay a cycle；After power combiner 301, as the point being repeated cyclically
Peak pulse is suppressed, and the avalanche signal occurred at random is retained.
The amplitude and phase unbalance degree of the balanced-unbalanced transformer 100 are extremely low, amplitude imbalance degree 0.1dB,
1 ° of phase unbalance degree, resulting common-mode rejection ratio are 45dB, ensure that and inhibit ratio to the high of spike.
The Length discrepancy delay line 201, is realized by PCB trace, and the difference L of the wherein track lengths of two paths of signals is
Wherein T is the signal period, and C is vacuum light speed, and ε is averaged relative dielectric constant for PCB.
The amplitude of the power combiner 301 is extremely low with phase unbalance degree, ensure that and inhibits ratio to the high of spike.
Firstth, it compares and is subtracted each other to eliminate spike noise, this practicality using one symmetrical signal of external input
The novel two paths of signals for subtracting each other is originated from signal all the way, and the matching degree higher of signal, spike inhibition is more
It is good.
Secondth, the utility model realizes signal processing using passive network, does not introduce active noise, greatly improves noise
Than especially in bandwidth applications, advantage is more obvious.
Third, the utility model are using the amplitude balanced-unbalanced transformer and power combing low with phase unbalance degree
Device, common-mode rejection ratio is high, is better than transformer or difference amplifier to the elimination effect of spike.
The passive network module realized GHz single-photon detectors spikes and inhibited of the utility model, using balance-no
Balance converter, Length discrepancy delay line and the cascade mode of power combiner inhibit the spike in signal, by
It can be made of in above-mentioned balanced-unbalanced transformer, Length discrepancy delay line and power combiner metal routing, so each mould
Block is realized by pcb board upward wiring form, compared in the prior art using independent modular unit, impedance matching effect
It is good, the space of modules unit installation is saved, reduces the high cost of each standalone module；The passive network mould simultaneously
Block essence is one piece of PCB unit, easy to manufacture.
Claims (3)
1. a kind of passive network module realized the spike of GHz single-photon detectors and inhibited, which is characterized in that including：
Balanced-unbalanced transformer, for input signal work(to be divided, the two paths of signals amplitude after work(point is equal and phase differs
180 °, the balanced-unbalanced transformer is including multistage capacitive coupling transmission line, signal input part and two paths of signals are defeated all the way
Outlet；
Signal delay unit, for the two paths of signals delay after the work(point to be differed a cycle, the signal delay unit
Using two-way Length discrepancy delay line；
Power combing unit, power combiner can be used in the power combing unit, after being synthesized by power combiner, as week
The spike that phase property repeats is suppressed, and the avalanche signal occurred at random is retained,
The two-way Length discrepancy delay of the multistage capacitive coupling transmission line and signal delay unit of the balanced-unbalanced transformer
Using being realized in pcb board upward wiring mode, the power combiner by resistance-type is combined and is realized in pcb board upward wiring line,
The balanced-unbalanced transformer output terminal connection signal delay cell, the output terminal connection power of the signal delay unit
Synthesis unit.
2. realizing the passive network module that the spike of GHz single-photon detectors inhibits as described in claim 1, feature exists
In the multistage capacitive coupling transmission line is realized using seven grades of capacitive coupling transmission lines.
3. the passive network module that the spike of GHz single-photon detectors inhibits is realized as claimed in claim 1 or 2, it is special
Sign is that the two-way Length discrepancy delay line is realized by curved in pcb board upward wiring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721438343.1U CN207472431U (en) | 2017-11-01 | 2017-11-01 | Realize the passive network module that the spike of GHz single-photon detectors inhibits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721438343.1U CN207472431U (en) | 2017-11-01 | 2017-11-01 | Realize the passive network module that the spike of GHz single-photon detectors inhibits |
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| Publication Number | Publication Date |
|---|---|
| CN207472431U true CN207472431U (en) | 2018-06-08 |
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| CN201721438343.1U Active CN207472431U (en) | 2017-11-01 | 2017-11-01 | Realize the passive network module that the spike of GHz single-photon detectors inhibits |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806932A (en) * | 2017-11-01 | 2018-03-16 | 浙江九州量子信息技术股份有限公司 | A kind of passive network module realized the spike of GHz single-photon detectors and suppressed |
-
2017
- 2017-11-01 CN CN201721438343.1U patent/CN207472431U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806932A (en) * | 2017-11-01 | 2018-03-16 | 浙江九州量子信息技术股份有限公司 | A kind of passive network module realized the spike of GHz single-photon detectors and suppressed |
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