JP2012257214A - 半導体装置とその動作方法 - Google Patents
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- 229910052782 aluminium Inorganic materials 0.000 description 2
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- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical class [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
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- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0219—Electrical interface; User interface
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
- G01J1/14—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means using comparison with a surface of graded brightness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
- G01J1/28—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source
- G01J1/30—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors
- G01J1/32—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors adapted for automatic variation of the measured or reference value
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
- H01L31/09—Devices sensitive to infrared, visible or ultraviolet radiation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
- H03F3/082—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light with FET's
Abstract
【解決手段】半導体装置に備えるスタンバイ回路をトランジスタ一つのみで構成し、該トランジスタに供給する電圧を切り替えることで、半導体装置の出力電流を制御する。これにより、スタンバイ状態での半導体装置の出力電流をほぼゼロにすることができるため、消費電力の低減が可能になる。なお、トランジスタの半導体層に酸化物半導体を用いることで、リーク電流を極小に抑えることができる。
【選択図】図1
Description
図1を用いて、本発明の半導体装置100について説明する。図1は本発明の半導体装置100の構成例を示す回路図である。本実施の形態では、図1における光電変換部101は、半導体装置100全体の消費電力を制御できるスタンバイ回路、光エネルギーを電気エネルギーに変換する光電変換素子、該光電変換素子で発生した微小な検出電流を増幅する電流増幅回路、をそれぞれ少なくとも一つ含むものとする。
<通常の動作状態(期間T1)>(図5参照。)
フォトダイオード103に光10が入射すると、光10の照度に応じてフォトダイオード103に電流が発生し、これをフォトダイオード103の検出電流IPDiとする。また、通常の動作状態(期間T1)では、第2の端子12に低電源電圧(Vss)が供給される。この時、トランジスタ106(nch)はオフ状態となる。トランジスタ106がオフ状態となっても、わずかにリーク電流が発生し、これをスタンバイ回路116の出力電流ISTB(リーク電流)とする。従って、参照側のトランジスタ104に流れる電流を、参照電流IREFとすると、参照電流IREFは、検出電流IPDiと出力電流ISTB(リーク電流)との差で表すこともできる。トランジスタ104に参照電流IREFが流れることで、参照側のトランジスタ104のゲート端子に電圧VGATEが発生する。参照側のトランジスタ104のゲート端子とミラー側のトランジスタ105(105_1〜105_n)のゲート端子のそれぞれとは、電気的に接続されているため、ミラー側のトランジスタ105(105_1〜105_n)のゲート端子のそれぞれにもまた、電圧VGATEが発生することになる。
これより、ミラー側のトランジスタ105(105_1〜105_n)のそれぞれに流れる電流を、ミラー電流Imirrorとすると、ミラー電流Imirrorは、参照電流IREFと等しくなる。(参照側のトランジスタ104とミラー側のトランジスタ105(105_1〜105_n)は同一の電気特性を有する。)従って、第3の端子13より得られる出力電流IOUTは、参照電流IREF(ミラー電流Imirror)とカレントミラー回路120に用いられたトランジスタの合計個数との積で表すことができる。
フォトダイオード103に光10が入射すると、光10の照度に応じてフォトダイオード103に電流が発生し、これをフォトダイオード103の検出電流IPDiとする。また、スタンバイ状態(期間T2)では、第2の端子12に高電源電圧(Vdd)が供給される。この時、トランジスタ106(nch)はオン状態となり、トランジスタ106にはスタンバイ回路116の出力電流ISTBが流れる。トランジスタ106がオン状態となるため、フォトダイオード103に発生した検出電流IPDiがトランジスタ106を流れることになる。即ち、スタンバイ状態(期間T2)では、スタンバイ回路116の出力電流ISTBとフォトダイオード103に発生した検出電流IPDiとが等しくなる。なお、この検出電流IPDiは非常に微小である。
本実施の形態では、実施の形態1において、In−Sn−Zn−O膜を酸化物半導体膜に用いたトランジスタの一例について、図9を用いて説明する。
(a―A)2+(b―B)2+(c―C)2≦r2
を満たすことを言い、rは、例えば、0.05とすればよい。他の酸化物でも同様である。
11 端子
12 端子
13 端子
14 端子
15 端子
100 半導体装置
101 光電変換部
102 抵抗素子
103 フォトダイオード
104 トランジスタ
105 トランジスタ
106 トランジスタ
107 容量素子
108 カレントミラー回路
116 スタンバイ回路
120 カレントミラー回路
400 基板
402 下地絶縁膜
404 保護絶縁膜
406 酸化物半導体膜
408 ゲート絶縁膜
410 ゲート電極
412 側壁絶縁膜
414 電極
416 層間絶縁膜
418 配線
600 基板
602 下地絶縁膜
606 酸化物半導体膜
608 ゲート絶縁膜
610 ゲート電極
614 電極
616 層間絶縁膜
618 配線
620 保護膜
Claims (5)
- 光電変換素子と、該光電変換素子で発生した電流を増幅する電流増幅回路と、スタンバイ回路とを有する光電変換部を有し、
前記光電変換部は、第1の端子、第2の端子、及び第3の端子を有し、
前記第1の端子には、電源電圧が供給され、
前記第2の端子には、抵抗素子が電気的に接続され、
前記第3の端子は、前記スタンバイ回路と電気的に接続されていることを特徴とする半導体装置。 - 請求項1において、前記電流増幅回路は、カレントミラー回路であることを特徴とする半導体装置。
- 請求項1または請求項2において、前記スタンバイ回路は、酸化物半導体層を有するトランジスタであることを特徴とする半導体装置。
- 請求項1乃至3のいずれか一において、さらに容量素子を有し、容量素子の一方の端子は、前記抵抗素子の一方の端子と電気的に接続されていることを特徴とする半導体装置。
- 請求項1乃至4のいずれか一において、前記スタンバイ回路は、前記電流増幅回路と電気的に接続されていることを特徴とする半導体装置。
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JPH01289381A (ja) * | 1988-05-17 | 1989-11-21 | Seiko Epson Corp | 増幅型固体撮像装置 |
JP2009047688A (ja) * | 2007-07-25 | 2009-03-05 | Semiconductor Energy Lab Co Ltd | 光電変換装置及びその光電変換装置を具備する電子機器 |
JP2009260503A (ja) * | 2008-04-14 | 2009-11-05 | Sharp Corp | 受光アンプ素子、光ピックアップ、およびそれを備える光ディスク記録再生装置 |
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JP2019009448A (ja) * | 2013-03-01 | 2019-01-17 | 株式会社半導体エネルギー研究所 | 半導体装置 |
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KR20120127254A (ko) | 2012-11-21 |
JP2016129364A (ja) | 2016-07-14 |
US9048788B2 (en) | 2015-06-02 |
JP6293176B2 (ja) | 2018-03-14 |
US20120286143A1 (en) | 2012-11-15 |
US20150263680A1 (en) | 2015-09-17 |
US9742362B2 (en) | 2017-08-22 |
KR102066749B1 (ko) | 2020-01-15 |
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