JPH11204736A - Input protecting circuit - Google Patents

Input protecting circuit

Info

Publication number
JPH11204736A
JPH11204736A JP742198A JP742198A JPH11204736A JP H11204736 A JPH11204736 A JP H11204736A JP 742198 A JP742198 A JP 742198A JP 742198 A JP742198 A JP 742198A JP H11204736 A JPH11204736 A JP H11204736A
Authority
JP
Japan
Prior art keywords
resistor
diodes
input
circuit
impedance matching
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.)
Granted
Application number
JP742198A
Other languages
Japanese (ja)
Other versions
JP3137258B2 (en
Inventor
Hideshi Tsumura
英志 津村
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP10007421A priority Critical patent/JP3137258B2/en
Publication of JPH11204736A publication Critical patent/JPH11204736A/en
Application granted granted Critical
Publication of JP3137258B2 publication Critical patent/JP3137258B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To improve both an electrostatic withstand voltage and an operating speed in the input protecting circuit of an IC. SOLUTION: Two diodes D3 and D4 are provided at the other side of an impedance matching resistance R1 so that the R1 , D3 , and D4 can function as a protecting circuit, and an electrostatic withstand voltage as a whole IC can be improved while being linked with a protecting circuit (R, D1 , and D2 ) on a signal main path. The diodes D3 and D4 are connected through a matching resistance R1 with an input terminal 1, so that the effect of the parasitic capacities of those diodes D3 and D4 on a high frequency signal inputted to the input terminal 1 can be reduced. Moreover, it is necessary for a terminal bias terminal 2 to obtain low impedance when a large capacity is connected, and the parasitic capacities of the diodes D3 and D4 can fulfill this necessity, and a result desired for a circuit operation can be obtained.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は集積回路(IC)の
入力保護回路に関し、特にGHz 帯の速度の高速信号を
扱う集積回路であってインピーダンス整合された入力端
子に対する静電保護を行う入力保護回路に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input protection circuit for an integrated circuit (IC), and more particularly to an input protection circuit for handling a high-speed signal in the GHz band, which performs electrostatic protection for an impedance-matched input terminal. Circuit.

【0002】[0002]

【従来の技術】この種の高速信号を扱うICの入力保護
回路は図2のように構成されていた。
2. Description of the Related Art An input protection circuit of an IC for handling such a high-speed signal has been configured as shown in FIG.

【0003】高速信号の伝送系では、50Ωの伝送イン
ピーダンスが一般的に用いられる。そのためICの入力
端子1も50Ωに整合する必要があるため、入力に50
Ωの抵抗(インピーダンスマッチング抵抗)R1の一端
が直接的に接続される。このマッチング抵抗R1の他端
は終端バイアス端子2としてIC外部に導かれており、
このバイアス端子2にはバイアスが供給される。例えば
伝送信号が−0.8V/−1.8VのいわゆるECLレ
ベルに適合した信号の場合には、このバイアス端子1に
−2Vを印加することで、DC的にも正常な整合回路を
構成できる。
In a high-speed signal transmission system, a transmission impedance of 50Ω is generally used. Therefore, the input terminal 1 of the IC also needs to be matched to 50Ω, so that 50
One end of a Ω resistor (impedance matching resistor) R1 is directly connected. The other end of the matching resistor R1 is guided outside the IC as a terminating bias terminal 2,
A bias is supplied to the bias terminal 2. For example, if the transmission signal is a signal conforming to the so-called ECL level of -0.8 V / -1.8 V, by applying -2 V to the bias terminal 1, a normal matching circuit can be constructed in terms of DC. .

【0004】さらに、入力端子1とIC内部の回路との
間には、静電保護用の抵抗Rと、2つのダイオードD
1 ,D2 から構成される静電保護回路が設けられてい
る。この静電保護回路は、過大な入力が入力端子1に入
力されると、抵抗Rにより過大電流を吸収し、それぞれ
正負の電源に接続された2つのダイオードD1 ,D2
より過大電圧を吸収する。
Further, a resistance R for electrostatic protection and two diodes D are provided between the input terminal 1 and a circuit inside the IC.
1, the electrostatic protection circuit composed of D 2 is provided. In this electrostatic protection circuit, when an excessive input is input to an input terminal 1, an excessive current is absorbed by a resistor R, and an excessive voltage is absorbed by two diodes D 1 and D 2 connected to positive and negative power supplies, respectively. I do.

【0005】[0005]

【発明が解決しようとする課題】前記従来の入力保護回
路による静電保護を適切に機能させるためには、抵抗R
と2つのダイオードD1 ,D2 とに、それぞれ必要な性
能が要求される。すなわち、抵抗RについてはIC内に
形成される抵抗素子を用いるが、この素子の面積が小さ
いと、過大な静電電流パルスに耐えられず、焼損してし
まう。同様に2つのダイオードD1 ,D2 についても、
そのデバイス面積が小さいと、規定の静電エネルギーに
耐えられない。ここで規定の静電エネルギーとは、例え
ばMIL規格では500Vの静電エネルギーに相当す
る。
In order for the electrostatic protection by the conventional input protection circuit to function properly, a resistor R is required.
And two diodes D 1 and D 2 are required to have required performance. That is, although a resistor element formed in an IC is used for the resistor R, if the area of the element is small, the element cannot withstand an excessively large electrostatic current pulse and burns out. Similarly, for the two diodes D 1 and D 2 ,
If the device area is small, it cannot withstand the prescribed electrostatic energy. Here, the prescribed electrostatic energy corresponds to, for example, 500 V electrostatic energy in the MIL standard.

【0006】静電保護(静電耐圧)を高めるためには、
抵抗Rおよび2つのダイオードD1,D2 を物理的に大き
く形成する必要があるが、その場合には、これらの素子
に付随する寄生容量、寄生インダクタンスなどが、この
ICの高周波特性に影響を及ぼし、GHz帯での動作が
不安定になってしまう。
In order to increase the electrostatic protection (electrostatic withstand voltage),
It is necessary to form the resistor R and the two diodes D 1 and D 2 physically large. In such a case, the parasitic capacitance and the parasitic inductance associated with these elements affect the high-frequency characteristics of the IC. As a result, the operation in the GHz band becomes unstable.

【0007】具体的には、抵抗Rについては、R=20
0Ω(L=20μm、W=50μmの注入抵抗)、2つ
のダイオードDi(i=1,2)については、Di (V
th=−0.4V、Lg =0.8μm、Wg =25μm×
4fingerで計100μm)を用いているが、このICの
動作速度は1GHzが限度で、かつその静電耐圧は70
0V程度というものであった。したがって、静電耐圧を
向上させれば動作速度の上限が低くなり、動作速度を向
上させれば静電耐圧が低下してしまうことになり、静電
耐圧および動作速度の両方を向上させることは困難であ
った。
Specifically, for the resistor R, R = 20
0Ω (L = 20μm, W = 50μm injection resistance), the two diodes Di (i = 1, 2) is, D i (V
th = −0.4 V, Lg = 0.8 μm, Wg = 25 μm ×
4 fingers, a total of 100 μm) is used, but the operation speed of this IC is limited to 1 GHz, and its electrostatic withstand voltage is 70 GHz.
It was about 0V. Therefore, if the electrostatic withstand voltage is improved, the upper limit of the operating speed is lowered, and if the operating speed is improved, the electrostatic withstand voltage is reduced, and it is impossible to improve both the electrostatic withstand voltage and the operating speed. It was difficult.

【0008】そこで本発明の目的は、以上のような問題
を解消した入力保護回路を提供することにある。
It is an object of the present invention to provide an input protection circuit which solves the above problems.

【0009】[0009]

【課題を解決するための手段】上記目的を達成するた
め、請求項1の発明は、信号が入力される入力端子に一
端が接続され集積回路の内部回路に他端が接続された静
電保護用抵抗と、前記入力端子に一端が接続されたイン
ピーダンスマッチング抵抗と、カソードが正側電極にア
ノードが前記静電保護用抵抗の他端に接続された第1の
ダイオードと、アノードが負側電極にカソードが前記静
電保護用抵抗の他端に接続された第2のダイオードと、
カソードが正側電極にアノードが前記インピーダンスマ
ッチング抵抗の他端に接続された第3のダイオードと、
アノードが負側電極にカソードが前記インピーダンスマ
ッチング抵抗の他端に接続された第4のダイオードとを
具えたことを特徴とする。
In order to achieve the above object, according to a first aspect of the present invention, there is provided an electrostatic protection device having one end connected to an input terminal to which a signal is input and the other end connected to an internal circuit of an integrated circuit. Resistance, an impedance matching resistor having one end connected to the input terminal, a first diode having a cathode connected to the positive electrode and an anode connected to the other end of the electrostatic protection resistor, and an anode connected to the negative electrode. A second diode having a cathode connected to the other end of the electrostatic protection resistor;
A third diode having a cathode connected to the positive electrode and an anode connected to the other end of the impedance matching resistor;
A fourth diode having an anode connected to the negative electrode and a cathode connected to the other end of the impedance matching resistor.

【0010】また請求項2の発明は、請求項1におい
て、前記集積回路が化合物半導体を材料とする電解効果
トランジスタを能動素子として含むことを特徴とする。
A second aspect of the present invention is characterized in that, in the first aspect, the integrated circuit includes a field effect transistor using a compound semiconductor as a material as an active element.

【0011】さらに請求項3の発明は、請求項1におい
て、前記静電保護用抵抗および前記インピーダンスマッ
チング抵抗の少なくとも一方が、不純物をイオン注入す
ることにより形成された注入抵抗で構成されていること
を特徴とする。
According to a third aspect of the present invention, in the first aspect, at least one of the electrostatic protection resistor and the impedance matching resistor is formed by an injection resistor formed by ion-implanting an impurity. It is characterized by.

【0012】さらに請求項4の発明は、請求項1におい
て、前記インピーダンスマッチング抵抗の他端が集積回
路外部に導かれていることを特徴とする。
Further, the invention of claim 4 is characterized in that, in claim 1, the other end of the impedance matching resistor is led outside the integrated circuit.

【0013】さらに請求項5の発明は、前記第3および
第4のダイオードの大きさは前記第1および第2のダイ
オードの大きさ以上の大きさであることを特徴とする。
Further, the invention according to claim 5 is characterized in that the size of the third and fourth diodes is larger than the size of the first and second diodes.

【0014】[0014]

【発明の実施の形態】図1は本発明の実施形態の回路図
を示す。本実施形態においては、信号主経路上の保護回
路、すなわち、抵抗Rおよび2つのダイオードD1 ,D
2 (従来の図2と同様)の他に、さらにマッチング抵抗
R1および2つのダイオードD3 ,D4 を加えて静電保
護回路を構成する。
FIG. 1 is a circuit diagram showing an embodiment of the present invention. In the present embodiment, the protection circuit on the signal main path, that is, the resistor R and the two diodes D 1 and D 1
2 (similar to the conventional FIG. 2), a matching resistor R1 and two diodes D 3 and D 4 are further added to form an electrostatic protection circuit.

【0015】図1において、1は入力端子、Rは入力端
子1に一端が接続され他端がIC内部回路に接続された
静電保護用の抵抗、R1は入力端子1に一端が接続され
たインピーダンスマッチング抵抗である。D1 ,D2
静電保護用のダイオードであって、D1 のアノードおよ
びD2 のカソードは抵抗Rの他端に共通接続され、D1
のカソードは正側電源(Vdd)におよびD2 のアノード
は負側電源(Vss)に各々接続されている。そして、D
3 ,D4 は他の静電保護用のダイオードであって、D3
のアノードおよびD4 のカソードはマッチング抵抗R1
の他端に共通接続され、D3 のカソードは正側電源(V
dd)におよびD4 のアノードは負側電源(Vss)に各々
接続されている。この2つのダイオードD3 ,D4 の接
続形態は2つのダイオードD1 ,D2 の接続形態と何等
変わる点はない。このように、2つのダイオードD3
4 をインピーダンスマッチング抵抗R1の他端側に設
けることによって、R1、D3 ,D4 も保護回路として
機能することになり、信号主経路上の保護回路と協働し
てIC全体としての静電耐圧を向上させる。
In FIG. 1, 1 is an input terminal, R is an electrostatic protection resistor having one end connected to the input terminal 1 and the other end connected to an IC internal circuit, and R1 is connected to the input terminal 1 at one end. This is an impedance matching resistor. D 1, D 2 is a diode for electrostatic discharge protection, the cathode of the anode and D 2 of D 1 are commonly connected to the other end of the resistor R, D 1
The cathode the anode of the positive side power source (Vdd) to and D 2 are respectively connected to the negative supply (Vss). And D
3 and D 4 are other diodes for electrostatic protection, and D 3
The cathode of the anode and D 4 matching resistor R1
Are commonly connected to the other end of the cathode of D 3 is the positive side power source (V
The anode of the dd) and D 4 are respectively connected to the negative supply (Vss). The connection form of these two diodes D 3 and D 4 is not different from the connection form of the two diodes D 1 and D 2 . Thus, two diodes D 3 ,
By providing the D 4 on the other end of the impedance matching resistor R1, R1, D 3, D 4 becomes to function as a protection circuit, the static overall IC in cooperation with the protective circuit on the signal main path Improve the withstand voltage.

【0016】2つのダイオードD3 ,D4 のデバイス面
積としては、例えば、Lg =0.8μm、Wg =25μ
m×4fingerで計100μmのものを用いることができ
る(具体例として、ダイオードD1 ,D2 のデバイス面
積は前述した通りであり、抵抗Rも前述した通りであ
る)。2つのダイオードD3 ,D4 のデバイス面積を信
号主経路上の保護回路の2つのダイオードD1 ,D2
それと同等以上に設定することで、IC全体としての静
電耐圧が一層向上する。上記例においては、1100V
の静電耐圧が得られた。また、2つのダイオードD3
4 はマッチング抵抗R1を介して入力端子1に接続さ
れているので、入力端子1に入力された高周波信号に対
してこれらのダイオードD3 ,D4 の寄生容量が与える
影響は皆無となり、さらには、通常この終端バイアス端
子2は大きな容量を接続して低インピーダンス化を図る
必要があるので、ダイオードD3 ,D4 の寄生容量は、
この必要性を満たすことができ、回路動作的に好ましい
結果を及ぼす。
The device area of the two diodes D 3 and D 4 is, for example, Lg = 0.8 μm and Wg = 25 μm.
An m × 4 finger having a total of 100 μm can be used (as a specific example, the device areas of the diodes D 1 and D 2 are as described above, and the resistance R is as described above). By setting the device area of the two diodes D 3 and D 4 to be equal to or greater than that of the two diodes D 1 and D 2 of the protection circuit on the main signal path, the electrostatic withstand voltage of the entire IC is further improved. In the above example, 1100V
Was obtained. Also, two diodes D 3 ,
Since D 4 is connected to the input terminal 1 through the matching resistor R1, the influence of the parasitic capacitance of the diodes D 3, D 4 is given to the input to the input terminal 1 RF signal becomes nil, further Usually, it is necessary to connect a large capacitance to the terminating bias terminal 2 to reduce the impedance, so that the parasitic capacitance of the diodes D 3 and D 4 is
This need can be met and has favorable circuit operation results.

【0017】本発明の入力保護回路を適用できるICと
しては、種々あるが、例えば、光通信用レーザダイオー
ド(LD)駆動回路、同受信前置増幅器、同受信主増幅
器等の信号速度が年々高速化している分野におけるIC
が挙げられる。特にLD駆動回路は、その駆動波形の素
直さからユニポーラ系のデバイスを用いる必要に迫られ
ているが、代表的なデバイスである化合物半導体を主材
料とするFETは、一般的に静電破壊に弱いデバイスで
あるが、それらのデバイスを使用したICに対し、本発
明入力保護回路を適用することは、高周波性能の劣化を
伴うことなく、静電耐圧を高めるのに非常に効果的であ
る。
There are various ICs to which the input protection circuit of the present invention can be applied. For example, the signal speed of a laser diode (LD) drive circuit for optical communication, a reception preamplifier, a reception main amplifier, and the like is increasing year by year. In the field of growing
Is mentioned. In particular, LD drive circuits are required to use unipolar devices due to the simplicity of their drive waveforms, but FETs, which are typically made of compound semiconductors as the main material, generally suffer from electrostatic breakdown. Although it is a weak device, applying the input protection circuit of the present invention to an IC using such a device is very effective in increasing the electrostatic withstand voltage without deteriorating the high frequency performance.

【0018】[0018]

【発明の効果】以上説明したように、本発明によれば、
ICの入力保護回路において静電耐圧および動作速度の
両方を向上させることができる。
As described above, according to the present invention,
In the input protection circuit of the IC, both the electrostatic withstand voltage and the operation speed can be improved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施形態の回路図である。FIG. 1 is a circuit diagram of an embodiment of the present invention.

【図2】従来の入力保護回路図である。FIG. 2 is a diagram of a conventional input protection circuit.

【符号の説明】[Explanation of symbols]

1 入力端子 2 終端バイアス端子 R 静電保護用の抵抗 R1 インピーダンスマッチング抵抗 D1 ,D2 ,D3 ,D4 ダイオードDESCRIPTION OF SYMBOLS 1 Input terminal 2 Termination bias terminal R Resistance for electrostatic protection R1 Impedance matching resistance D 1 , D 2 , D 3 , D 4 Diode

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 信号が入力される入力端子に一端が接続
され集積回路の内部回路に他端が接続された静電保護用
抵抗と、前記入力端子に一端が接続されたインピーダン
スマッチング抵抗と、カソードが正側電極にアノードが
前記静電保護用抵抗の他端に接続された第1のダイオー
ドと、アノードが負側電極にカソードが前記静電保護用
抵抗の他端に接続された第2のダイオードと、カソード
が正側電極にアノードが前記インピーダンスマッチング
抵抗の他端に接続された第3のダイオードと、アノード
が負側電極にカソードが前記インピーダンスマッチング
抵抗の他端に接続された第4のダイオードとを具えたこ
とを特徴とする入力保護回路。
1. An electrostatic protection resistor having one end connected to an input terminal to which a signal is input and the other end connected to an internal circuit of an integrated circuit; an impedance matching resistor having one end connected to the input terminal; A first diode having a cathode connected to the positive electrode and an anode connected to the other end of the electrostatic protection resistor; and a second diode having an anode connected to the negative electrode and the cathode connected to the other end of the electrostatic protection resistor. A third diode having a cathode connected to the positive electrode and an anode connected to the other end of the impedance matching resistor, and a fourth diode having an anode connected to the negative electrode and the cathode connected to the other end of the impedance matching resistor. An input protection circuit comprising: a diode;
【請求項2】 請求項1において、 前記集積回路が化合物半導体を材料とする電解効果トラ
ンジスタを能動素子として含むことを特徴とする入力保
護回路。
2. The input protection circuit according to claim 1, wherein the integrated circuit includes a field effect transistor using a compound semiconductor as a material as an active element.
【請求項3】 請求項1において、 前記静電保護用抵抗および前記インピーダンスマッチン
グ抵抗の少なくとも一方が、不純物をイオン注入するこ
とにより形成された注入抵抗で構成されていることを特
徴とする入力保護回路。
3. The input protection according to claim 1, wherein at least one of the electrostatic protection resistor and the impedance matching resistor is formed by an injection resistor formed by ion-implanting an impurity. circuit.
【請求項4】 請求項1において、 前記インピーダンスマッチング抵抗の他端が集積回路外
部に導かれていることを特徴とする入力保護回路。
4. The input protection circuit according to claim 1, wherein the other end of the impedance matching resistor is led outside the integrated circuit.
【請求項5】 前記第3および第4のダイオードの大き
さは前記第1および第2のダイオードの大きさ以上の大
きさであることを特徴とする入力保護回路。
5. The input protection circuit according to claim 1, wherein the size of the third and fourth diodes is larger than the size of the first and second diodes.
JP10007421A 1998-01-19 1998-01-19 Input protection circuit Expired - Fee Related JP3137258B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10007421A JP3137258B2 (en) 1998-01-19 1998-01-19 Input protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10007421A JP3137258B2 (en) 1998-01-19 1998-01-19 Input protection circuit

Publications (2)

Publication Number Publication Date
JPH11204736A true JPH11204736A (en) 1999-07-30
JP3137258B2 JP3137258B2 (en) 2001-02-19

Family

ID=11665417

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10007421A Expired - Fee Related JP3137258B2 (en) 1998-01-19 1998-01-19 Input protection circuit

Country Status (1)

Country Link
JP (1) JP3137258B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103378088A (en) * 2012-04-28 2013-10-30 上海华虹Nec电子有限公司 Polycrystalline silicon diode electrostatic protection structure
CN111656467A (en) * 2018-02-07 2020-09-11 国际商业机器公司 Electrostatic protection device
CN114499458A (en) * 2021-02-19 2022-05-13 中国科学院微电子研究所 Input front end matching circuit and input front end matching circuit signal chain structure

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Publication number Priority date Publication date Assignee Title
CN103378088A (en) * 2012-04-28 2013-10-30 上海华虹Nec电子有限公司 Polycrystalline silicon diode electrostatic protection structure
CN111656467A (en) * 2018-02-07 2020-09-11 国际商业机器公司 Electrostatic protection device
JP2021513738A (en) * 2018-02-07 2021-05-27 インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Machines Corporation Electrostatic protection devices and integrated circuits to protect electronic circuit input ports
CN114499458A (en) * 2021-02-19 2022-05-13 中国科学院微电子研究所 Input front end matching circuit and input front end matching circuit signal chain structure

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