JPS5570113A - Differential amplifier - Google Patents

Differential amplifier

Info

Publication number
JPS5570113A
JPS5570113A JP14375178A JP14375178A JPS5570113A JP S5570113 A JPS5570113 A JP S5570113A JP 14375178 A JP14375178 A JP 14375178A JP 14375178 A JP14375178 A JP 14375178A JP S5570113 A JPS5570113 A JP S5570113A
Authority
JP
Japan
Prior art keywords
voltage
difference
power source
constant
fet212
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
JP14375178A
Other languages
Japanese (ja)
Inventor
Tatsuji Asakawa
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP14375178A priority Critical patent/JPS5570113A/en
Publication of JPS5570113A publication Critical patent/JPS5570113A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To secure the constant voltage free from the power source dependence by supplying the constant voltage produced by the difference of the different threshold voltage to the gate voltage of the constant power source transistor. CONSTITUTION:MOSFET210 and 211 of the bias circuit are formed with the same characteristics and the same geometric dimensions. And differential input MOSFET 212 and 213 feature the different threshold characteristics, and its output VBO feature the value obtained by adding the difference of the threshold voltage of FET212 and 213 to bias voltage TG. Then MOSFET214 and 202 are turned to the elements of the same characteristics and same geometric dimensions, and so is with MOSFET 215 and 201. Thus the output VB features the value obtained by adding the difference between the threshold voltage of FET212 and 213 to power voltage VSS, and the difference of different threshold voltage of FET212 and 213 is supplied to the gate voltage of constant power source MOSFET203. As a result, the constant voltage free from the power source dependence can be obtained.
JP14375178A 1978-11-21 1978-11-21 Differential amplifier Pending JPS5570113A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14375178A JPS5570113A (en) 1978-11-21 1978-11-21 Differential amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14375178A JPS5570113A (en) 1978-11-21 1978-11-21 Differential amplifier

Publications (1)

Publication Number Publication Date
JPS5570113A true JPS5570113A (en) 1980-05-27

Family

ID=15346162

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14375178A Pending JPS5570113A (en) 1978-11-21 1978-11-21 Differential amplifier

Country Status (1)

Country Link
JP (1) JPS5570113A (en)

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