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JPS5714758A - Characteristic measuring instrument of semiconductor - Google Patents

Characteristic measuring instrument of semiconductor

Info

Publication number
JPS5714758A
JPS5714758A JP8981080A JP8981080A JPS5714758A JP S5714758 A JPS5714758 A JP S5714758A JP 8981080 A JP8981080 A JP 8981080A JP 8981080 A JP8981080 A JP 8981080A JP S5714758 A JPS5714758 A JP S5714758A
Authority
JP
Japan
Prior art keywords
amplifier
output side
tolerance
constitution
semiconductor
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
JP8981080A
Other languages
Japanese (ja)
Inventor
Junichi Shimoda
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 Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8981080A priority Critical patent/JPS5714758A/en
Publication of JPS5714758A publication Critical patent/JPS5714758A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/26—Testing of individual semiconductor devices
    • G01R31/2607—Circuits therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)

Abstract

PURPOSE:To prevent damage of amplifier by setting attenuators on the front stage of the amplifier to adjust the level of signals inputted by variation of impedance on the output side. CONSTITUTION:An amplifier 12 is connected on the output side of the high-frequency oscillator 10 through a circulator 13 and a continuously variable type attenuator 19, and a measuring transistor 18 and an output voltmeter 17 are connected to the output side of the amplifier 12 through a directional coupling 14. If input side of the TR18 is short-circuited, load impedance against the amplifier 12 becomes small and amplifier may be broken because the maximum output power exceeds the tolerance. In this case, attenuation is controlled by the attenuator 19 by using the negative feedback loop NF1 so that the maximum output power does not exceed the tolerance. Therefore, by this constitution, damage of amplifier can be prevented.
JP8981080A 1980-07-01 1980-07-01 Characteristic measuring instrument of semiconductor Pending JPS5714758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8981080A JPS5714758A (en) 1980-07-01 1980-07-01 Characteristic measuring instrument of semiconductor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8981080A JPS5714758A (en) 1980-07-01 1980-07-01 Characteristic measuring instrument of semiconductor

Publications (1)

Publication Number Publication Date
JPS5714758A true JPS5714758A (en) 1982-01-26

Family

ID=13981073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8981080A Pending JPS5714758A (en) 1980-07-01 1980-07-01 Characteristic measuring instrument of semiconductor

Country Status (1)

Country Link
JP (1) JPS5714758A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5650238A (en) * 1994-08-01 1997-07-22 Nkk Corporation Zinc-electroplated steel sheet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5650238A (en) * 1994-08-01 1997-07-22 Nkk Corporation Zinc-electroplated steel sheet
US5810991A (en) * 1994-08-01 1998-09-22 Nkk Corporation Zinc-electroplated steel sheet and method thereof

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