JPS5610266A - Current amplification factor measuring circuit - Google Patents

Current amplification factor measuring circuit

Info

Publication number
JPS5610266A
JPS5610266A JP8603579A JP8603579A JPS5610266A JP S5610266 A JPS5610266 A JP S5610266A JP 8603579 A JP8603579 A JP 8603579A JP 8603579 A JP8603579 A JP 8603579A JP S5610266 A JPS5610266 A JP S5610266A
Authority
JP
Japan
Prior art keywords
base
comparator
amplifier
amplification factor
current
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
JP8603579A
Other languages
Japanese (ja)
Inventor
Takeshi Yamano
Junichi Mihashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8603579A priority Critical patent/JPS5610266A/en
Publication of JPS5610266A publication Critical patent/JPS5610266A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To measure the current amplification factor of a bipolar transistor omitting an ammeter and at high speed by using an amplifier and a comparator composed of operational amplifiers.
CONSTITUTION: The collector, base and emitter of an NPN bipolar transistor 4 are connected to a collector terminal 1, a base terminal 2 and an emitter terminal 3 respectively. If a positive voltage is applied to the base of the NPN bipolar transistor 4 through the base terminal 2, the NPN bipolar transistor 4 is turned on and voltages appear at the output of an amplifier A1 and the noninverting input of a comparator A2. When the output of the amplifier A1 and the noninverting input voltage of the comparator A2 becomes the output of the amplifier A1 corresponding to a required current that flows through the collector terminal 1 and the noninverting input voltage of the comparator A2 equal to the inverting input voltage of the comparator A2, a base current will become constant. A current amplification factor can be determined from the base current corresponding to the required current that flows through the collector terminal 1.
COPYRIGHT: (C)1981,JPO&Japio
JP8603579A 1979-07-04 1979-07-04 Current amplification factor measuring circuit Pending JPS5610266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8603579A JPS5610266A (en) 1979-07-04 1979-07-04 Current amplification factor measuring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8603579A JPS5610266A (en) 1979-07-04 1979-07-04 Current amplification factor measuring circuit

Publications (1)

Publication Number Publication Date
JPS5610266A true JPS5610266A (en) 1981-02-02

Family

ID=13875405

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8603579A Pending JPS5610266A (en) 1979-07-04 1979-07-04 Current amplification factor measuring circuit

Country Status (1)

Country Link
JP (1) JPS5610266A (en)

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