JPS57123719A - Variable reference voltage type comparator - Google Patents

Variable reference voltage type comparator

Info

Publication number
JPS57123719A
JPS57123719A JP56007923A JP792381A JPS57123719A JP S57123719 A JPS57123719 A JP S57123719A JP 56007923 A JP56007923 A JP 56007923A JP 792381 A JP792381 A JP 792381A JP S57123719 A JPS57123719 A JP S57123719A
Authority
JP
Japan
Prior art keywords
voltage
turns
reference voltage
switching
equivalent
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.)
Granted
Application number
JP56007923A
Other languages
Japanese (ja)
Other versions
JPH0241208B2 (en
Inventor
Yoshinori Kuroki
Junjiro Kitano
Ichiro Ohigata
Kuniyasu Kawarada
Toshio Hayashi
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.)
Hitachi Ltd
NTT Inc
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone 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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP56007923A priority Critical patent/JPS57123719A/en
Publication of JPS57123719A publication Critical patent/JPS57123719A/en
Publication of JPH0241208B2 publication Critical patent/JPH0241208B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
    • H03K3/0233—Bistable circuits
    • H03K3/02337—Bistables with hysteresis, e.g. Schmitt trigger

Landscapes

  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To prevent oscillation by performing switching operation fast by composing the 2nd switch of an equivalent PNPN switch circuit in a comparator which has hysteresis characteristics through the switching of the 1st and 2nd switches. CONSTITUTION:When an input voltage E is higher than a reference voltage Vt1 obtained through the voltage division of resistances R11 and R12, a transistor TR11 turns on, a TR12 turns off, and a TR17, therefore, turns off, so that any voltage is developed at an output terminal. When the voltage drops below the voltage Vt1, the TR11 turns off and the TR12 also turns off. This inversion is performed rapidly because a TR13 constituting an equivalent PNPN switch circuit also operates in cooperation, and a resistance R13 is inserted in parallel to the R11, so that the reference voltage applied to the base of the TR12 rises up to a Vt2. When the voltage E rises above the voltage Vt2, the TR11 turns on, and the TRs 12, 13 and 17 turn off to make the reference voltage drop down to the Vt1, ceasing the output voltage. The switching of the reference voltage is performed simultaneously with the on-off operation of the TR12, so oscillation never occurs.
JP56007923A 1981-01-23 1981-01-23 Variable reference voltage type comparator Granted JPS57123719A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56007923A JPS57123719A (en) 1981-01-23 1981-01-23 Variable reference voltage type comparator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56007923A JPS57123719A (en) 1981-01-23 1981-01-23 Variable reference voltage type comparator

Publications (2)

Publication Number Publication Date
JPS57123719A true JPS57123719A (en) 1982-08-02
JPH0241208B2 JPH0241208B2 (en) 1990-09-17

Family

ID=11679042

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56007923A Granted JPS57123719A (en) 1981-01-23 1981-01-23 Variable reference voltage type comparator

Country Status (1)

Country Link
JP (1) JPS57123719A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6053065U (en) * 1983-09-21 1985-04-13 株式会社東芝 voltage comparison circuit
JPS616773U (en) * 1984-06-19 1986-01-16 株式会社東芝 voltage comparison circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4852456A (en) * 1971-11-05 1973-07-23
JPS516454A (en) * 1974-07-04 1976-01-20 Mitsubishi Electric Corp
JPS5146055A (en) * 1974-08-21 1976-04-20 Rca Corp
JPS5547732A (en) * 1978-09-30 1980-04-04 Toshiba Corp Oscillation circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4852456A (en) * 1971-11-05 1973-07-23
JPS516454A (en) * 1974-07-04 1976-01-20 Mitsubishi Electric Corp
JPS5146055A (en) * 1974-08-21 1976-04-20 Rca Corp
JPS5547732A (en) * 1978-09-30 1980-04-04 Toshiba Corp Oscillation circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6053065U (en) * 1983-09-21 1985-04-13 株式会社東芝 voltage comparison circuit
JPS616773U (en) * 1984-06-19 1986-01-16 株式会社東芝 voltage comparison circuit

Also Published As

Publication number Publication date
JPH0241208B2 (en) 1990-09-17

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