CN102800667A - Method for solving antenna effect in chip design - Google Patents
Method for solving antenna effect in chip design Download PDFInfo
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- CN102800667A CN102800667A CN201210236253XA CN201210236253A CN102800667A CN 102800667 A CN102800667 A CN 102800667A CN 201210236253X A CN201210236253X A CN 201210236253XA CN 201210236253 A CN201210236253 A CN 201210236253A CN 102800667 A CN102800667 A CN 102800667A
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Abstract
The invention relates to a method and a circuit for solving the problem of antenna effect in a chip design. In some chip designs, an active shield physical protection design needs to be adopted for the purpose of preventing invasive attack to smart card chips. An active shielding layer has a defending effect on both attacks needing physical modification and those damaging partial functions of the chips. An active shielding line adopts a top layer metal and has a relatively long routing, and thus can cause severe antenna effect. When the traditional method of adding a diode is adopted, a relatively large chip area are usually occupied. The method provided by the method adopts a circuit with a transmission gate structure to solve the problem of antenna effect, and the circuit is simple in structure and easy to implement, and by using the method and the circuit, functions of the circuit are not affected.
Description
Technical field
The present invention proposes the Method and circuits that solves antenna effect in a kind of chip design.This invention is applicable to the smart card designs field.
Background technology
Attack method to intelligent card chip is a lot, roughly can be divided three classes, and it is wherein one type that intrusive mood is attacked, and is also referred to as physical attacks.Instrument in the normally used chip reverse engineering comprises and removes Chip Packaging, extraction domain, cutting/connecting circuit.The active shielding layer is to the needs physically modifying, and the attack that destroys the chip partial function all has protection effect.
When the intelligent card chip physical layout design, regular meeting adopts top-level metallic to do the active shielding of entire chip.Suppose that metal wire begins cabling at random in certain starting point of top layer in the design, and be paved with top-level metallic, receive standard cell at certain terminal point through lower metal then and judge.Because receive the grid (suppose that this wires track lengths is 1500mm, girth is 3000mm) of metal-oxide-semiconductor after the top-level metallic cabling is very long, regular according to the ANT in certain technology:
diffTap＝diff?or?tap
Ant_short＝(tap?NOT?poly)NOT?nwell
SRCDRNTAP＝diffTap?NOT?poly
Ant_diode＝SRCDRNTAP?NOT?Ant_short
Gate_ant＝poly?AND?diff
fgate_11＝NET?AREA?RATIO?Gate_ant?Ant_short＝＝0
1) supposes that the standard cell of judging is certain standard cell,, then know that according to the information in the design library AREA (fgate_11) is 2.1x0.15=0.315um^2 like NAND gate.Satisfy the ANT rule, then need AREA (Ant_diode) greater than 20232um^2.If adopt insertion diode (diode area is 1.08umx0.69um) to solve the ANT problem, then need insert 27150.
2) suppose the standard cell of own design decision, its L is increased by 10 times, AREA (fgate_11) is 2.1x1.5=0.315um^2.Satisfy the ANT rule, then need AREA (Ant_diode) greater than 2018um^2.If adopt insertion diode (diode area is 1.08umx0.69um) to solve the ANT problem, then need insert 2708.
From above analysis result, see,, need to add a large amount of diodes or design large-area diode, thereby bring the consumption of area if take this method.
Summary of the invention
To the problems referred to above, what the present invention proposed is a kind of effective solution, can solve antenna effect with less area.
1, in this method, the active shielding line is received the transmission gate circuit of metal-oxide-semiconductor M1 and metal-oxide-semiconductor M2 composition earlier, and then receive the standard cell in the decision circuit 2.Through top-level metallic active shielding line being connect the mode of the metal-oxide-semiconductor drain terminal of transmission gate, rather than the gate end, avoided destruction to the metal-oxide-semiconductor grid, the electric charge that accumulates on the top-level metallic active shielding line simultaneously also is not enough to puncture the junction of transmission gate.On the other hand, according to the antenna effect inspection rule of this technology, AREA this moment (fgate_11) then is 0, does not then have the antenna effect problem.
2, through above analysis, adopt this kind solution, can solve the antenna effect problem that adopts the active shielding physical protection to bring in the intelligent card chip design, can reduce the consumption problem of area in the problem description simultaneously.
Description of drawings
The circuit diagram of Fig. 1 embodiment of the invention chips solved in design antenna effect
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, the present invention is implemented to explain further details below in conjunction with accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as to qualification of the present invention.
As shown in Figure 1, be implementation method overall structure frame diagram of the present invention, this embodiment has comprised (but being not limited to) four functional modules: decision circuitry 1, the active shielding line solves the antenna effect circuit, decision circuit 2.
As shown in Figure 1, the present invention solves the embodiment sketch map of the Method and circuits of antenna effect, and this circuit comprises the transmission gate circuit of (but being not limited to) PMOS and NMOS composition, a TIEL circuit, a TIEH circuit.
The operation principle that solves the antenna effect circuit is described as follows; Through top-level metallic active shielding line being connect the mode of the metal-oxide-semiconductor drain terminal of transmission gate; Rather than gate end; Avoided the destruction to the metal-oxide-semiconductor grid, the electric charge that accumulates on the top-level metallic active shielding line simultaneously also is not enough to puncture the junction of transmission gate.On the other hand, according to the antenna effect inspection rule of this technology, AREA this moment (fgate_11) then is 0, does not then have the antenna effect problem.
In sum; Solve the Method and circuits of antenna effect in a kind of chip design provided by the invention; The antenna effect problem that adopts the active shielding physical protection to bring in the intelligent card chip design can be solved, the consumption problem of area in the problem description can be reduced simultaneously.
Claims (1)
1. solve the method for antenna effect in the chip design; It is characterized in that; This method is through connecing the active shielding line metal-oxide-semiconductor drain terminal of transmission gate circuit; Rather than the gate end, avoided destruction to the metal-oxide-semiconductor grid, the electric charge that accumulates on the active shielding line simultaneously also is not enough to puncture the junction of transmission gate; On the other hand, according to antenna effect inspection rule, this moment, area consumption was 0, solved antenna effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210236253XA CN102800667A (en) | 2012-07-04 | 2012-07-04 | Method for solving antenna effect in chip design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210236253XA CN102800667A (en) | 2012-07-04 | 2012-07-04 | Method for solving antenna effect in chip design |
Publications (1)
| Publication Number | Publication Date |
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| CN102800667A true CN102800667A (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210236253XA Pending CN102800667A (en) | 2012-07-04 | 2012-07-04 | Method for solving antenna effect in chip design |
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| CN (1) | CN102800667A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118829A (en) * | 2015-09-18 | 2015-12-02 | 芯佰微电子（北京）有限公司 | Protecting circuit to remove antenna effect of active shielding layer |
| CN106096498A (en) * | 2016-05-26 | 2016-11-09 | 深圳华视微电子有限公司 | Fingerprint circuit and ID generation unit thereof on a kind of sheet based on antenna effect |
| CN107122567A (en) * | 2017-05-23 | 2017-09-01 | 上海华虹宏力半导体制造有限公司 | Module carries out antenna effect inspection method before being incorporated to |
| CN110363032A (en) * | 2019-07-24 | 2019-10-22 | 北京智芯微电子科技有限公司 | The active shield layer circuit of safety chip |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5959311A (en) * | 1998-07-08 | 1999-09-28 | United Microelectronics Corp. | Structure of an antenna effect monitor |
| US20010010093A1 (en) * | 2000-01-25 | 2001-07-26 | Nec Corporation | Layout design method |
| TW479292B (en) * | 2001-03-14 | 2002-03-11 | Taiwan Semiconductor Mfg | Method and apparatus to prevent damage to MOS device from antenna effect |
| CN101083264A (en) * | 2006-06-02 | 2007-12-05 | 中芯国际集成电路制造(上海)有限公司 | Proctive circuit of metal-oxide-semiconductor transistor and its producing method |
-
2012
- 2012-07-04 CN CN201210236253XA patent/CN102800667A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5959311A (en) * | 1998-07-08 | 1999-09-28 | United Microelectronics Corp. | Structure of an antenna effect monitor |
| US20010010093A1 (en) * | 2000-01-25 | 2001-07-26 | Nec Corporation | Layout design method |
| TW479292B (en) * | 2001-03-14 | 2002-03-11 | Taiwan Semiconductor Mfg | Method and apparatus to prevent damage to MOS device from antenna effect |
| CN101083264A (en) * | 2006-06-02 | 2007-12-05 | 中芯国际集成电路制造(上海)有限公司 | Proctive circuit of metal-oxide-semiconductor transistor and its producing method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118829A (en) * | 2015-09-18 | 2015-12-02 | 芯佰微电子（北京）有限公司 | Protecting circuit to remove antenna effect of active shielding layer |
| CN106096498A (en) * | 2016-05-26 | 2016-11-09 | 深圳华视微电子有限公司 | Fingerprint circuit and ID generation unit thereof on a kind of sheet based on antenna effect |
| CN106096498B (en) * | 2016-05-26 | 2019-03-26 | 深圳华视微电子有限公司 | A kind of on piece fingerprint circuit and its ID generation unit based on antenna effect |
| CN107122567A (en) * | 2017-05-23 | 2017-09-01 | 上海华虹宏力半导体制造有限公司 | Module carries out antenna effect inspection method before being incorporated to |
| CN110363032A (en) * | 2019-07-24 | 2019-10-22 | 北京智芯微电子科技有限公司 | The active shield layer circuit of safety chip |
| CN110363032B (en) * | 2019-07-24 | 2021-03-12 | 北京智芯微电子科技有限公司 | Active shielding layer circuit of safety chip |
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Address after: 102209 Beijing, Beiqijia, the future of science and technology in the south area of China electronic network security and information technology industry base C building, Applicant after: Beijing CEC Huada Electronic Design Co., Ltd. Address before: 100102 Beijing City, Chaoyang District Lize two Road No. 2, Wangjing science and Technology Park A block five layer Applicant before: Beijing CEC Huada Electronic Design Co., Ltd. |
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Application publication date: 20121128 |