CN202034982U - Photo-detection circuit used for safety protection of chip - Google Patents
Photo-detection circuit used for safety protection of chip Download PDFInfo
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- CN202034982U CN202034982U CN2011200971712U CN201120097171U CN202034982U CN 202034982 U CN202034982 U CN 202034982U CN 2011200971712 U CN2011200971712 U CN 2011200971712U CN 201120097171 U CN201120097171 U CN 201120097171U CN 202034982 U CN202034982 U CN 202034982U
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- photodiode
- detection circuit
- amplification
- module
- circuit
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Abstract
The utility model provides a photo-detection circuit used for safety protection of a chip and relates to the technical field of photoelectric detection. The photo-detection circuit comprises a photoelectric conversion module, an amplification module, a filter module and an output module. The photo-detection circuit has the structural characteristics that the photoelectric conversion module comprises a main photodiode and an auxiliary photodiode that are integrated, the main photodiode is used for receiving an optical signal, and the auxiliary photodiode is used for releasing the thermocurrent generated by the temperature effect in the main photodiode. The amplification module comprises a multilevel current amplifier and an active adjustable load structure; by adjusting a load digital control terminal, different active load combinations can be achieved to perform step amplification of the current; and the output module adopts a Schmitt trigger to perform latched amplification and filtering of a voltage signal of the circuit. The photo-detection circuit can reduce or eliminate the impact of the thermocurrent on the photodiodes, improves the safety, reduces the signal to noise ratio and has the characteristics that the circuit is simple, the cost is low, and the power consumption is saved.
Description
Technical field
The utility model relates to photoelectric detection technology field, especially for the optical detection circuit of chip security protection.
Background technology
Photoelectric detecting technology combines with electronics by optics and realizes detection to chip sensitization aspect.Utilize photodetector that optical information is converted to electronic information, by electronic technology optical signalling is detected, and the electronic information after will changing carries out signal processing such as circuit amplification, filtering and finally reaches signal of telecommunication output, realizes the purpose that the chip circuit protection detects.In photodetector, adopt the light sensitive diode that is integrated in chip internal, convert light signal to the signal of telecommunication by this light sensitive diode.When photodiode was worked at reverse voltage, dark current was extremely faint; When illumination was arranged, reverse current increased rapidly.Light intensity is big more, and oppositely photocurrent is also big more, thereby light signal is converted to the signal of telecommunication, the signal of telecommunication is carried out filtering amplify, the security protection signal that output obtains detecting.Shine under the situation unglazed, dark current can increase rapidly along with the rising of temperature, and basic exponentially form increases, and makes the low light level detect to become and is difficult to carry out.
In the prior art, as shown in Figure 1, optical detection circuit adopts photoelectric conversion module, amplification filtering module and output module to obtain the output of photoreceptor signal voltage.Referring to Fig. 2, shown the conversion and the circuit amplification process of photodiode in the prior art, the photocurrent that produces of photodiode and produced simultaneously thermocurrent is converted and through amplifying output independently wherein, cause the disabler because of Temperature Influence of light testing result easily, fail safe is not high and the output voltage signal to noise ratio is big.Simultaneously, the amplification filtering module of prior art generally adopts voltage amplifier circuit, electric current during to voltage transitions the resistance in the module can cause a part of thermal noise, influence the sensitivity of photoreceptor signal.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the purpose of this utility model provides a kind of optical detection circuit that is used for the chip security protection.It can reduce or eliminate the influence of thermocurrent to light sensitive diode, improves the fail safe of testing circuit, reduces signal to noise ratio, has the advantages that circuit is simple, with low cost, save power consumption.
In order to reach the foregoing invention purpose, the technical solution of the utility model realizes as follows:
The optical detection circuit that is used for the chip security protection, it comprises photoelectric conversion module, amplification module, filtration module and output module.Its design feature is that described photoelectric conversion module comprises integrated key light electric diode and from photodiode, the key light electric diode carries out the reception of light signal, from photodiode the thermocurrent that temperature effect the key light electric diode produces is discharged.Amplification module comprises multistage current amplifier and the active support structures of adjusting, and by the adjustment to the digital control end of load, obtains different active load combination the carrying out amplifications step by step of electric current; Output module adopts Schmidt trigger that the voltage signal of circuit is latched amplification and filtering.
In above-mentioned optical detection circuit, described key light electric diode with adopt identical active region area from photodiode.
The utility model adopts two integrated photodiodes owing to adopted said structure, effectively reduces the influence of thermocurrent to the photoreceptor signal electric current when receiving incident light, makes photosignal effectively to change.The utility model structure has guaranteed that chip is subjected to the light time in the front, and chip is in the safeguard protection state, guarantees that sensitization is more accurate, more responsive.The amplification step by step and the current limliting of photoelectric current in the utility model can prevent because photoreceptor signal is too strong, electric current is excessive and defective chip.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is a prior art optical detection circuit structural representation;
Fig. 2 is a prior art independent light electric diode opto-electronic conversion schematic diagram;
Fig. 3 is a structural representation of the present utility model;
Fig. 4 is the integrated photodiode opto-electronic conversion schematic diagram of the utility model;
Fig. 5 adjusts circuit block diagram for the utility model photosignal amplifies active load;
Fig. 6 is that the utility model opto-electronic conversion voltage output function realizes block diagram;
Fig. 7 is the utility model photoelectric conversion signal output schematic diagram.
Embodiment
Referring to Fig. 3, the utility model optical detection circuit comprises photoelectric conversion module, amplification module, filtration module and the output module that connects successively.Photoelectric conversion module comprises the key light electric diode D1 of the integrated identical active region area of employing and from photodiode D2, key light electric diode D1 carries out the reception of light signal, from photodiode D2 the thermocurrent that temperature effect the key light electric diode D1 produces is discharged.Amplification module comprises multistage current amplifier and the active support structures of adjusting, and by the adjustment to the digital control end of load, obtains different active load combination the carrying out amplifications step by step of electric current; Output module adopts Schmidt trigger that the voltage signal of circuit is latched amplification and filtering.
During the utility model work; main light sensitive diode D1 converts the light signal that receives to current signal; produce simultaneously thermocurrent is arranged; and along with temperature raises; thermocurrent sharply increases; utilize and from photodiode D2 the thermocurrent under the same ambient temperature is discharged this moment, only photocurrent handled the numeral output that obtains the photoelectric protection signal, improved the confidence level of signal.Simultaneously, to the light signal that captures amplify, the output of filtering and digital signal.The utility model can add above main light sensitive diode D1 that the barrier layer of metal is to keep its photosensitive property.
Referring to Fig. 4, the utility model amplification module adopts current amplifier that photocurrent is amplified step by step, the progression of amplifying circuit and multiplication factor are partly determined by minimum photocurrent and output active load, simultaneously the amplifying circuit electric current is carried out current limliting, prevent that sensitization intensity is excessive, chip circuit damages.The electric current summation of each current amplification circuit is subjected to the total current Iss restriction of current-limiting circuit part.
Referring to Fig. 5, adopt the photocurrent conversion of signals after active tunable load will amplify to become voltage signal in the utility model.Current signal output Iss_out through after amplifying becomes circuit required voltage signal through the active loading section of adjusting.This active adjustment in the load circuit, adopt n road active load, by control required load is adjusted the circuit active load, photocurrent power according to conversion, obtain different photocurrent intensity, the corresponding different active load adjusted is exported switching current to voltage transitions control, obtains the useful voltage signal.After the pre-amplification of circuit, the circuit photoreceptor signal is carried out the adjusted load control transformation of electric current to voltage, improved the adjustability of circuit and the integrated level of circuit, saved circuit cost.
Referring to Fig. 6, select for use the threshold value comparison circuit that noise signal is suppressed.In this circuit is realized, adopt Schmidt's latch that circuit is carried out filtering and amplify, conversion gained voltage signal is amplified latch output, avoid interference.Improve the integrated level of circuit, simplified circuit.
Referring to Fig. 7, the output voltage of test the utility model under different light intensity.Test result shows that the sensitization safeguard function of chip circuit is good, and under the various luminous intensities of test, by suitable load adjustment, output is applicable to the detection signal of protecting safety of circuit.
Claims (2)
1. the optical detection circuit that is used for the chip security protection, it comprises photoelectric conversion module, amplification module, filtration module and the output module that connects successively, it is characterized in that, described photoelectric conversion module comprises integrated key light electric diode (D1) and from photodiode (D2), key light electric diode (D1) carries out the reception of light signal, from photodiode (D2) thermocurrent that temperature effect the key light electric diode (D1) produces is discharged; Amplification module comprises multistage current amplifier and the active support structures of adjusting, and by the adjustment to the digital control end of load, obtains different active load combination the carrying out amplifications step by step of electric current; Output module adopts Schmidt trigger that the voltage signal of circuit is latched amplification and filtering.
2. optical detection circuit according to claim 1 is characterized in that, described key light electric diode (D1) with adopt identical active region area from photodiode (D2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200971712U CN202034982U (en) | 2011-04-06 | 2011-04-06 | Photo-detection circuit used for safety protection of chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200971712U CN202034982U (en) | 2011-04-06 | 2011-04-06 | Photo-detection circuit used for safety protection of chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202034982U true CN202034982U (en) | 2011-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200971712U Expired - Lifetime CN202034982U (en) | 2011-04-06 | 2011-04-06 | Photo-detection circuit used for safety protection of chip |
Country Status (1)
| Country | Link |
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| CN (1) | CN202034982U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739304A (en) * | 2011-04-06 | 2012-10-17 | 北京同方微电子有限公司 | Light detection circuit used for chip safety protection |
| CN102904647A (en) * | 2012-11-05 | 2013-01-30 | 北京半导体照明科技促进中心 | Light receiving module, light signal processing circuit and light signal processing method |
| US11646276B2 (en) | 2020-08-07 | 2023-05-09 | Shenzhen GOODIX Technology Co., Ltd. | Detection circuit for laser fault injection attack on chip and security chip |
-
2011
- 2011-04-06 CN CN2011200971712U patent/CN202034982U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739304A (en) * | 2011-04-06 | 2012-10-17 | 北京同方微电子有限公司 | Light detection circuit used for chip safety protection |
| CN102904647A (en) * | 2012-11-05 | 2013-01-30 | 北京半导体照明科技促进中心 | Light receiving module, light signal processing circuit and light signal processing method |
| CN102904647B (en) * | 2012-11-05 | 2017-04-12 | 珠海横琴华策光通信科技有限公司 | Light receiving module, light signal processing circuit and light signal processing method |
| US11646276B2 (en) | 2020-08-07 | 2023-05-09 | Shenzhen GOODIX Technology Co., Ltd. | Detection circuit for laser fault injection attack on chip and security chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111109 |