JPS63102331A - Inspection of semiconductor integrated circuit - Google Patents

Inspection of semiconductor integrated circuit

Info

Publication number
JPS63102331A
JPS63102331A JP61248742A JP24874286A JPS63102331A JP S63102331 A JPS63102331 A JP S63102331A JP 61248742 A JP61248742 A JP 61248742A JP 24874286 A JP24874286 A JP 24874286A JP S63102331 A JPS63102331 A JP S63102331A
Authority
JP
Japan
Prior art keywords
power supply
leakage
block
photoirradiated
supply leakage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP61248742A
Other languages
Japanese (ja)
Inventor
Norimitsu Uematsu
植松 紀光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Priority to JP61248742A priority Critical patent/JPS63102331A/en
Publication of JPS63102331A publication Critical patent/JPS63102331A/en
Pending legal-status Critical Current

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  • Testing Or Measuring Of Semiconductors Or The Like (AREA)
  • Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
  • Tests Of Electronic Circuits (AREA)

Abstract

PURPOSE:To easily detect any defective power supply leakage due to floating node by a method wherein a part of diffused layer of a circuit pattern formed on the surface of a chip of a semiconductor integrated circuit is photoirradiated to detect a leakage current while shifting the photoirradiated positions. CONSTITUTION:A whole chip is theoretically divided into multiple blocks assuming a size corresponding to a photoirradiated space on the chip surface of a device under testing (DUT) 3 as one block. Next, the DUT 3 is impressed with a power supply voltage and an input pattern by a pattern generator 6 and a DC measuring unit 7 to set up a power supply leakage in the measurable state. The power supply leakage is measured by means of irradiating respective blocks by command of a controller 8 to record measured values of power supply leakage and positions of blocks. If there is any block wherein the measured values of power supply leakage are fluctuated by photoirradiation, it may be estimated that a floating node exists in a circuit of the block. Through these procedures, the time required for trouble shooting can be cut down.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、相補型半導体集積回路(以下、CMO8LS
Iと略す)の故障解析に有益な検査方法に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a complementary semiconductor integrated circuit (hereinafter referred to as CMO8LS).
This invention relates to an inspection method that is useful for failure analysis of (abbreviated as I).

従来の技術 CMO8LSIは、そのデバイスの構造上スタンバイ時
の消費電流(以下電源リークと呼ぶ)が、他のデバイス
と比較して、著しく小さいという特長があり、それゆえ
にCMO3LSIを設計する際にはその特長を十分生か
した設計をすべきである。しかしながら、CMO8LS
Iは回路設計によっては、回路内の動作状態によりハイ
インピーダンスのノード(以下フローティングノードと
呼ぶ)が存在する場合がある。
Conventional technology CMO8LSI has a feature that the current consumption during standby (hereinafter referred to as power leakage) is significantly smaller than other devices due to the structure of the device.Therefore, when designing CMO3LSI, it is important to The design should take full advantage of its features. However, CMO8LS
Depending on the circuit design, a high impedance node (hereinafter referred to as a floating node) may exist depending on the operating state of the circuit.

発明が解決しようとする問題点 フローティングノードが形成されている場合、そのノー
ドの電位は不安定であり中間電位になることがある。こ
のような場合、このフローティングノードに接続されて
いる入力ゲートは、PチャネルトランジスタとNチャネ
ルトランジスタが共に導通状態となってしまい、その入
力ゲートの正の電源側から負の電源側に貫通電流が流れ
電源リーク電流の値を増加させてしまうことがある。こ
のような箇所が大規模化してLSIの内部に存在してい
る場合、その箇所を検出することは、大変困難な作業で
ある。
Problems to be Solved by the Invention When a floating node is formed, the potential of the node is unstable and may reach an intermediate potential. In such a case, both the P-channel transistor and the N-channel transistor of the input gate connected to this floating node become conductive, and a through current flows from the positive power supply side of the input gate to the negative power supply side. This may increase the value of power supply leakage current. When such a large-scale location exists inside an LSI, detecting the location is a very difficult task.

従来、このような不良箇所を検出する効果的な解析手法
は見出されていなかった。
Until now, no effective analysis method for detecting such defective locations has been found.

本発明は、上記のようなフローティングノードに起因し
た電源リーク不良の故障箇所を検出することの可能な検
査手段を提供するものである。
The present invention provides an inspection means capable of detecting a failure location of a power leak failure caused by a floating node as described above.

問題点を解決するための手段 本発明は、CMO8LSIのデバイスのチップ表面に形
成されている回路パターンの拡散層の一部に光を照射さ
せ、電源リークの値を検査する方法で、光の照射位置を
移動させながら電源リークの値を測定し、故障箇所を検
出する方法である。
Means for Solving the Problems The present invention is a method for inspecting the value of power leakage by irradiating a part of the diffusion layer of a circuit pattern formed on the chip surface of a CMO8LSI device with light. This method measures the power leakage value while moving the device and detects the location of the failure.

作用 本発明によると、半導体のPn接合に光を照射した時に
光起電力が生じ、これを利用して、フローティングノー
ドの位置を検出することが可能である。CMO8LSI
の場合、P型板散層に光が照射されるとその拡散層内に
正孔が発生し正の電圧を生ずる。またN型拡散層に光が
照射された場合はその拡散層内に電子が発生し負の電圧
を生ずる。この作用を利用して回路内のフローティング
ノードに接続されているP型またはN型拡散層に光を照
射し、フローティングノードの電位を強制的に変化させ
、その時の電源リーク電流の変化を検出することができ
る。
Effects According to the present invention, a photovoltaic force is generated when a Pn junction of a semiconductor is irradiated with light, and by using this, it is possible to detect the position of a floating node. CMO8LSI
In this case, when the P-type plate diffusion layer is irradiated with light, holes are generated within the diffusion layer and a positive voltage is generated. Furthermore, when the N-type diffusion layer is irradiated with light, electrons are generated within the diffusion layer and a negative voltage is generated. Using this effect, light is irradiated onto the P-type or N-type diffusion layer connected to the floating node in the circuit, the potential of the floating node is forcibly changed, and the change in power supply leakage current at that time is detected. be able to.

実施例 本発明による一実施例を説明する。Example An embodiment according to the present invention will be described.

図面は、本発明の検査方法を実施するための装置である
。同図で、1は光源、2はスポット状の光、3は被測定
デバイス(以下DUTと呼ぶ)、4はX−Yステージ、
5はX−Yステージ位置制御装置、6はパターンジェネ
レータ、7はDC測定ユニット、8はコントローラ、9
は出力装置である。また、X−Yステージ位置制御装置
5、パターンジェネレータ6、DC測定ユニット7、出
力袋N9はケーブルによってコントローラ8と接続され
る。またDUT3の周辺は光シールド用ボックス10に
よって光シールドされる。
The drawing shows an apparatus for carrying out the inspection method of the present invention. In the figure, 1 is a light source, 2 is a spot of light, 3 is a device under test (hereinafter referred to as DUT), 4 is an X-Y stage,
5 is an X-Y stage position control device, 6 is a pattern generator, 7 is a DC measurement unit, 8 is a controller, 9
is the output device. Further, the X-Y stage position control device 5, pattern generator 6, DC measurement unit 7, and output bag N9 are connected to the controller 8 by a cable. Further, the periphery of the DUT 3 is optically shielded by an optical shielding box 10.

次に、この図面の装置を用いて、本発明の方法について
説明する。
Next, the method of the present invention will be explained using the apparatus shown in this drawing.

DUT3のチップ表面上に照射される光の照射面積に相
当する大きさを1ブロツクとして、チップ全体を理論上
、多数にブロック分けする。このときX−Yステージを
移動させてブロック分けした各ブロック内にだけ光が照
射されるようにX−Yステージ位置制御装置5によって
、X−Yステージを移動させる座標位置をコントローラ
8で制御して、同コントローラ8の指示によって任意の
ブロックに光が照射できるようにしてお(。次にパター
ンジェネレータ6とDC測定ユニット7により、DUT
3に電源電圧と入カバターンを印加して電源リークを測
定できる状態にセットする。
Theoretically, the entire chip is divided into a large number of blocks, with each block having a size corresponding to the irradiation area of the light irradiated onto the chip surface of the DUT 3. At this time, the coordinate position to which the X-Y stage is moved is controlled by the controller 8 by the X-Y stage position control device 5 so that the X-Y stage is moved and the light is irradiated only within each divided block. Then, the pattern generator 6 and DC measurement unit 7 are used to irradiate light onto any block according to instructions from the controller 8.
Apply the power supply voltage and input cover turn to 3 and set it to a state where power leakage can be measured.

電源リークの測定値はコントローラ8からの指示があれ
ば、常に測定値をこのコントローラ8に送信できるよう
にセットする。以上の状態で、1ブロツクずつ光を照射
していき、その時の電源リークの測定値とブロックの位
置を記録してい(。
The measured value of the power supply leak is set so that it can always be sent to the controller 8 if there is an instruction from the controller 8. In the above state, light is irradiated one block at a time, and the measured value of power leakage and the position of the block are recorded (.

光を照射したことによって電源リーク値の測定値が変化
したブロックがあれば、そのブロック内の回路にフロー
ティングノードが存在していることが推定できる。
If there is a block in which the measured value of the power leakage value changes due to irradiation with light, it can be estimated that a floating node exists in the circuit within that block.

発明の効果 本発明によれば、CMO3LSIのチップ内の回路のフ
ローティングノードを容易に検出することができ、故障
解析に要する時間を大幅に削減することができる。
Effects of the Invention According to the present invention, floating nodes in circuits within a CMO3LSI chip can be easily detected, and the time required for failure analysis can be significantly reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明を実施するための検査装置概要図である。 1・・・・・・光源、2・・・・・・光源から出力され
る光、3・・・・・・被測定デバイス、4・・・・・・
X−Yステージ、5・・・・・・X−Yステージ位置制
御装置、6・・・・・・パターンジェネレータ、7・・
・・・・DC測定ユニット、8・・・・・・コントロー
ラ、9・・・・・・出力装置、10・・・・・・光シー
ルド用ボックス・
The drawing is a schematic diagram of an inspection device for implementing the present invention. 1...Light source, 2...Light output from the light source, 3...Device under test, 4...
X-Y stage, 5... X-Y stage position control device, 6... Pattern generator, 7...
...DC measurement unit, 8...Controller, 9...Output device, 10...Light shield box.

Claims (1)

【特許請求の範囲】[Claims] 半導体集積回路のチップ表面に形成されている回路パタ
ーンの拡散層の一部分に光を照射し、この光の照射位置
を移動させながら、リーク電流を検査することを特徴と
する半導体集積回路の検査方法。
A method for inspecting a semiconductor integrated circuit, characterized by irradiating a portion of a diffusion layer of a circuit pattern formed on a chip surface of a semiconductor integrated circuit with light, and inspecting leakage current while moving the irradiation position of the light. .
JP61248742A 1986-10-20 1986-10-20 Inspection of semiconductor integrated circuit Pending JPS63102331A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61248742A JPS63102331A (en) 1986-10-20 1986-10-20 Inspection of semiconductor integrated circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61248742A JPS63102331A (en) 1986-10-20 1986-10-20 Inspection of semiconductor integrated circuit

Publications (1)

Publication Number Publication Date
JPS63102331A true JPS63102331A (en) 1988-05-07

Family

ID=17182686

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61248742A Pending JPS63102331A (en) 1986-10-20 1986-10-20 Inspection of semiconductor integrated circuit

Country Status (1)

Country Link
JP (1) JPS63102331A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010056278A (en) * 2008-08-28 2010-03-11 Seiko Epson Corp Semiconductor device inspecting method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5721832A (en) * 1980-07-15 1982-02-04 Toshiba Corp Measuring apparatus for semiconductor
JPS5780731A (en) * 1980-11-07 1982-05-20 Toshiba Corp Detecting device for improper semiconductor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5721832A (en) * 1980-07-15 1982-02-04 Toshiba Corp Measuring apparatus for semiconductor
JPS5780731A (en) * 1980-11-07 1982-05-20 Toshiba Corp Detecting device for improper semiconductor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010056278A (en) * 2008-08-28 2010-03-11 Seiko Epson Corp Semiconductor device inspecting method

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