JPH04256354A - Semiconductor device - Google Patents

Semiconductor device

Info

Publication number
JPH04256354A
JPH04256354A JP1786691A JP1786691A JPH04256354A JP H04256354 A JPH04256354 A JP H04256354A JP 1786691 A JP1786691 A JP 1786691A JP 1786691 A JP1786691 A JP 1786691A JP H04256354 A JPH04256354 A JP H04256354A
Authority
JP
Japan
Prior art keywords
resistance
polysilicon
resistor
length
sheet
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
JP1786691A
Other languages
Japanese (ja)
Inventor
Toshiyuki Watanabe
敏幸 渡辺
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.)
NEC Yamagata Ltd
Original Assignee
NEC Yamagata Ltd
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 NEC Yamagata Ltd filed Critical NEC Yamagata Ltd
Priority to JP1786691A priority Critical patent/JPH04256354A/en
Publication of JPH04256354A publication Critical patent/JPH04256354A/en
Pending legal-status Critical Current

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  • Semiconductor Integrated Circuits (AREA)

Abstract

PURPOSE:To increase the area of a polysilicon resistance whose resistance value is small and to enhance the electrostatic breakdown strength and the resistance accuracy of the resistance by a method wherein a plurality of resistances which are composed of a polysilicon layer and whose sheet resistance is different are built in. CONSTITUTION:A plurality of resistances 1, 2 which are composed of a polysilicon layer and whose sheet resistance is different are built in. For example, the following are formed: a resistance R1 which has been connected between an input end and a base for a transistor TR; and a resistance R2 which has been connected between the base and an emitter for the transistor TR. R2=2XR1 is set. In this case, when the sheet resistance rhos of a polysilicon resistance 2 corresponding to the resistance R2 is set at AOMEGA/square, ions are implanted selectively into a polysilicon resistance 1 corresponding to the resistance R1 and the sheet resistance rhos of the polysilicon resistance 1 is made small at 1/2AOMEGA/square. Thereby, the length L1 of the polysilicon resistance 1 is made the same length as the length L2 of the polysilicon resistance 2.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、半導体装置に関し、特
にポリシリコン層からなる抵抗素子(以下ポリシリコン
抵抗と記す)を有する半導体装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor device, and more particularly to a semiconductor device having a resistive element made of a polysilicon layer (hereinafter referred to as a polysilicon resistor).

【0002】0002

【従来の技術】従来のポリシリコン抵抗を内蔵する半導
体装置は、図3に示すようにトランジスタTRの入力端
とベース間に接続した抵抗R1とトランジスタTRのベ
ースとエミッタ間に接続した抵抗R2とを備えている。
2. Description of the Related Art A conventional semiconductor device incorporating a polysilicon resistor has a resistor R1 connected between the input terminal and the base of a transistor TR, and a resistor R2 connected between the base and emitter of the transistor TR, as shown in FIG. It is equipped with

【0003】この半導体装置は図4に示すように抵抗R
1に相当するポリシリコン抵抗1と抵抗R2に相当する
ポリシリコン抵抗2のシート抵抗ρS は同一である。
This semiconductor device has a resistor R as shown in FIG.
The sheet resistances ρS of polysilicon resistor 1 corresponding to R1 and polysilicon resistor 2 corresponding to resistor R2 are the same.

【0004】従って、抵抗R1及びR2は、ポリシリコ
ン抵抗1の長さをL1、ポリシリコン抵抗2の長さをL
2、ポリシリコン抵抗1,2の幅をWとするとR1=ρ
S ×L1/W R2=ρS ×L2/W となり、R1<R2である場合は、L1<L2となる。
Therefore, the length of the resistors R1 and R2 is L1, the length of the polysilicon resistor 1 is L1, and the length of the polysilicon resistor 2 is L1.
2. If the width of polysilicon resistors 1 and 2 is W, then R1=ρ
S×L1/W R2=ρS×L2/W, and when R1<R2, L1<L2.

【0005】上式からは、抵抗値を変えるためのパラメ
ータとしてポリシリコン抵抗の幅Wがあるが、極端に細
くした場合は、ポリシリコン層をパターニングするフォ
トリソグラフィーのばらつきによりポリシリコン抵抗の
幅Wの寸法がばらつき、抵抗精度が悪くなる。また、逆
に太くした場合は、チップサイズが大きくなるため一定
の最適化されたポリシリコン抵抗の幅Wで作成する。
From the above equation, the width W of the polysilicon resistor is a parameter for changing the resistance value, but if it is made extremely thin, the width W of the polysilicon resistor will change due to variations in the photolithography used to pattern the polysilicon layer. The dimensions of the resistor vary, resulting in poor resistance accuracy. On the other hand, if the resistor is made thicker, the chip size becomes larger, so the polysilicon resistor is manufactured with a constant and optimized width W.

【0006】[0006]

【発明が解決しようとする課題】この従来のポリシリコ
ン抵抗では、R1<R2となる抵抗値の場合、抵抗R1
に相当するポリシリコン抵抗の面積が小さくなるため静
電破壊強度が弱くなり、また抵抗R1に相当するポリシ
リコン抵抗の長さL1が短かくなるため、抵抗R1の抵
抗精度が悪くなるという問題点があった。
[Problems to be Solved by the Invention] In this conventional polysilicon resistor, when the resistance value is R1<R2, the resistance R1
Since the area of the polysilicon resistor corresponding to resistor R1 becomes smaller, the electrostatic breakdown strength becomes weaker, and the length L1 of the polysilicon resistor corresponding to resistor R1 becomes shorter, so the resistance accuracy of resistor R1 deteriorates. was there.

【0007】[0007]

【課題を解決するための手段】本発明の半導体装置は、
ポリシリコン層からなり且つ異なるシート抵抗を有する
複数の抵抗を内蔵して構成される。
[Means for Solving the Problems] A semiconductor device of the present invention includes:
It is made of a polysilicon layer and includes a plurality of built-in resistors having different sheet resistances.

【0008】[0008]

【実施例】次に、本発明について図面を参照して説明す
る。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

【0009】図1は本発明の第1の実施例を示すレイア
ウト図である。
FIG. 1 is a layout diagram showing a first embodiment of the present invention.

【0010】図1に示すように、図3の等価回路におけ
るR2=2×R1すなわちR1<R2の関係が成立する
例を示している。抵抗R2に相当するポリシリコン抵抗
2のシート抵抗ρS をAΩ/□とすると、抵抗R1に
相当するポリシリコン抵抗1に選択的にイオン注入を追
加してポリシリコン抵抗1のシート抵抗ρS を1/2
AΩ/□と小さくすることにより、ポリシリコン抵抗1
の長さL1は、シート抵抗ρS をAΩ/□とした場合
の2倍の長さとすることができ、ポリシリコン抵抗2の
長さL2と同じ長さにすることができる。
As shown in FIG. 1, an example is shown in which the relationship R2=2×R1, that is, R1<R2 in the equivalent circuit of FIG. 3 holds true. If the sheet resistance ρS of the polysilicon resistor 2 corresponding to the resistor R2 is AΩ/□, then ion implantation is selectively added to the polysilicon resistor 1 corresponding to the resistor R1 to reduce the sheet resistance ρS of the polysilicon resistor 1 to 1/ 2
By reducing AΩ/□, polysilicon resistance 1
The length L1 can be twice the length when the sheet resistance ρS is AΩ/□, and can be made the same length as the length L2 of the polysilicon resistor 2.

【0011】図2は、本発明の第2の実施例を示すレイ
アウト図である。
FIG. 2 is a layout diagram showing a second embodiment of the present invention.

【0012】図2に示すように、第1の実施例と同じく
抵抗値が、R2=2×R1の関係にある例を示す。
As shown in FIG. 2, an example is shown in which the resistance values have the relationship R2=2×R1, as in the first embodiment.

【0013】ポリシリコン抵抗1のシート抵抗ρS を
ポリシリコン抵抗2の1/4とすることにより、ポリシ
リコン抵抗1のポリシリコン長さL1はポリシリコン抵
抗2のポリシリコン長さL2の2倍にすることができ、
ポリシリコン抵抗1の面積を抵抗値が小さいにもかかわ
らず2倍とすることができる。
By setting the sheet resistance ρS of polysilicon resistor 1 to 1/4 of polysilicon resistor 2, the polysilicon length L1 of polysilicon resistor 1 becomes twice the polysilicon length L2 of polysilicon resistor 2. can,
The area of polysilicon resistor 1 can be doubled despite its small resistance value.

【0014】[0014]

【発明の効果】以上説明したように本発明は、異なるシ
ート抵抗を有する複数のポリシリコン抵抗を備えること
により、小さい抵抗値となるポリシリコン抵抗のシート
抵抗を小さくして、抵抗値の小さいポリシリコン抵抗の
面積を大きくすることができるため、静電破壊強度,抵
抗精度を向上させることができる。
Effects of the Invention As explained above, the present invention provides a plurality of polysilicon resistors having different sheet resistances, thereby reducing the sheet resistance of the polysilicon resistor having a low resistance value, and thereby reducing the sheet resistance of the polysilicon resistor having a low resistance value. Since the area of the silicon resistor can be increased, electrostatic breakdown strength and resistance accuracy can be improved.

【0015】図3に示す抵抗内蔵トランジスタの抵抗R
1の面積による静電破壊強度実測データ(C=200p
F)を以下に示す。
Resistance R of the transistor with a built-in resistor shown in FIG.
Electrostatic breakdown strength actual measurement data by area of 1 (C=200p
F) is shown below.

【0016】(a)実測値1 ポリシリコン抵抗幅が15μm,ポリシリコン抵抗長さ
が75μmでポリシリコン抵抗面積が1125μm2 
のとき静電破壊強度は340Vであり、 (b)実測値2 ポリシリコン抵抗幅が15μm,ポリシリコン抵抗長さ
が150μmでポリシリコン抵抗面積が2250μm2
 のとき静電破壊強度は410Vであり、(c)実測値
3 ポリシリコン抵抗幅が15μm,ポリシリコン抵抗長さ
が165μmでポリシリコン抵抗面積が2475μm2
 のとき静電破壊強度は455Vであり、(d)実測値
4 ポリシリコン抵抗幅が15μm,ポリシリコン抵抗長さ
が330μmでポリシリコン抵抗面積が4950μm2
 のとき静電破壊強度は570Vであった。
(a) Actual measurement value 1 The polysilicon resistance width is 15 μm, the polysilicon resistance length is 75 μm, and the polysilicon resistance area is 1125 μm2.
When the electrostatic breakdown strength is 340V, (b) Actual measurement value 2 The polysilicon resistance width is 15μm, the polysilicon resistance length is 150μm, and the polysilicon resistance area is 2250μm2
When the electrostatic breakdown strength is 410V, (c) actual measurement value 3, the polysilicon resistance width is 15 μm, the polysilicon resistance length is 165 μm, and the polysilicon resistance area is 2475 μm2.
When the electrostatic breakdown strength is 455V, (d) Actual measurement value 4 The polysilicon resistance width is 15μm, the polysilicon resistance length is 330μm, and the polysilicon resistance area is 4950μm2
At this time, the electrostatic breakdown strength was 570V.

【0017】以上の実測データよりポリシリコン抵抗の
面積を大きくすれば、静電破壊強度を向上できることが
わかる。
From the above measured data, it can be seen that the electrostatic breakdown strength can be improved by increasing the area of the polysilicon resistor.

【0018】また、抵抗精度もフォトリソグラフィーに
おけるポリシリコン抵抗の長さLのばらつきをΔLとす
ると抵抗精度はΔL/Lとなり、ΔLはポリシリコン抵
抗長さLに関係なく一定であるため、ポリシリコン抵抗
のシート抵抗ρS を小さくしLを大きくすることによ
って、抵抗精度を向上できる。
Furthermore, if the variation in length L of the polysilicon resistor in photolithography is ΔL, then the resistance accuracy is ΔL/L, and since ΔL is constant regardless of the length L of the polysilicon resistor, By decreasing the sheet resistance ρS of the resistor and increasing L, the resistance accuracy can be improved.

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

【図1】本発明の第1の実施例を示すレイアウト図であ
る。
FIG. 1 is a layout diagram showing a first embodiment of the present invention.

【図2】本発明の第2の実施例を示すレイアウト図であ
る。
FIG. 2 is a layout diagram showing a second embodiment of the present invention.

【図3】従来の半導体装置の一例を示す回路図である。FIG. 3 is a circuit diagram showing an example of a conventional semiconductor device.

【図4】従来の半導体装置の一例を示すレイアウト図で
ある。
FIG. 4 is a layout diagram showing an example of a conventional semiconductor device.

【符号の説明】[Explanation of symbols]

1,2    ポリシリコン抵抗 3    ベースボンディングパッド 4    ベース電極 5    エミッタ電極 6    ベース拡散領域 7    エミッタ拡散領域 1, 2 Polysilicon resistor 3 Base bonding pad 4 Base electrode 5 Emitter electrode 6 Base diffusion region 7 Emitter diffusion region

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  ポリシリコン層からなり且つ異なるシ
ート抵抗を有する複数の抵抗を内蔵することを特徴とす
る半導体装置。
1. A semiconductor device comprising a plurality of built-in resistors made of a polysilicon layer and having different sheet resistances.
JP1786691A 1991-02-08 1991-02-08 Semiconductor device Pending JPH04256354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1786691A JPH04256354A (en) 1991-02-08 1991-02-08 Semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1786691A JPH04256354A (en) 1991-02-08 1991-02-08 Semiconductor device

Publications (1)

Publication Number Publication Date
JPH04256354A true JPH04256354A (en) 1992-09-11

Family

ID=11955588

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1786691A Pending JPH04256354A (en) 1991-02-08 1991-02-08 Semiconductor device

Country Status (1)

Country Link
JP (1) JPH04256354A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6031263A (en) * 1983-08-01 1985-02-18 Nec Corp Semiconductor integrated circuit device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6031263A (en) * 1983-08-01 1985-02-18 Nec Corp Semiconductor integrated circuit device

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Effective date: 19970805