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JPS5462766A - Logic circuit of current change-over type - Google Patents

Logic circuit of current change-over type

Info

Publication number
JPS5462766A
JPS5462766A JP12939077A JP12939077A JPS5462766A JP S5462766 A JPS5462766 A JP S5462766A JP 12939077 A JP12939077 A JP 12939077A JP 12939077 A JP12939077 A JP 12939077A JP S5462766 A JPS5462766 A JP S5462766A
Authority
JP
Japan
Prior art keywords
voltage
constant
supply
generating circuit
current supply
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
JP12939077A
Other languages
Japanese (ja)
Inventor
Takahisa Nishimura
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 JP12939077A priority Critical patent/JPS5462766A/en
Publication of JPS5462766A publication Critical patent/JPS5462766A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
    • H03K19/08—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices
    • H03K19/082—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices using bipolar transistors
    • H03K19/086—Emitter coupled logic

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Logic Circuits (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To reduce varition in output voltage owing to the voltage variation of an external voltage supply, by interposing a constant-volatage generating circuit between the external positive voltage supply and one terminal of a load connected to collectors of several transistors for current switching. CONSTITUTION:The constant-voltage generating circuit depending upon the ground potential is interposed between one terminal of load Rc and external positive voltage supply (potential Vcc) in the circuit, several couples of Trs of which are supplied with a reference voltage at their bases and with an input signal voltage at bases and are connected in common to a constant-current supply at emitters. The constant-voltage generating circuit and constant-current supply consist of Trs Q1 and Q2, TrQ3 operating as a constant-current supply, and resistances R1 to R5. Here, denoting the forward junction voltage by VBE results in that the emitter potential of high-level output VHO=TrQ2 of the logic circuit is nearly (R1+R2 +R3)VBE/R3 and low-level output VOL is nearly VHO-R2RcVBE/R3R5, so that the output voltage will be under little influence of power voltage Vcc.
JP12939077A 1977-10-27 1977-10-27 Logic circuit of current change-over type Pending JPS5462766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12939077A JPS5462766A (en) 1977-10-27 1977-10-27 Logic circuit of current change-over type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12939077A JPS5462766A (en) 1977-10-27 1977-10-27 Logic circuit of current change-over type

Publications (1)

Publication Number Publication Date
JPS5462766A true JPS5462766A (en) 1979-05-21

Family

ID=15008386

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12939077A Pending JPS5462766A (en) 1977-10-27 1977-10-27 Logic circuit of current change-over type

Country Status (1)

Country Link
JP (1) JPS5462766A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02123822A (en) * 1988-10-03 1990-05-11 Internatl Business Mach Corp <Ibm> Logic circuit and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02123822A (en) * 1988-10-03 1990-05-11 Internatl Business Mach Corp <Ibm> Logic circuit and control method thereof

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