JPS57154930A - Schmitt circuit - Google Patents

Schmitt circuit

Info

Publication number
JPS57154930A
JPS57154930A JP4109081A JP4109081A JPS57154930A JP S57154930 A JPS57154930 A JP S57154930A JP 4109081 A JP4109081 A JP 4109081A JP 4109081 A JP4109081 A JP 4109081A JP S57154930 A JPS57154930 A JP S57154930A
Authority
JP
Japan
Prior art keywords
voltage
turned
trs
vdd
current flows
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
JP4109081A
Other languages
Japanese (ja)
Inventor
Takao Nano
Shinichi Miyake
Akio Murayama
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Sanyo Denki 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP4109081A priority Critical patent/JPS57154930A/en
Publication of JPS57154930A publication Critical patent/JPS57154930A/en
Pending 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
    • H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
    • H03K3/356—Bistable circuits
    • H03K3/3565—Bistables with hysteresis, e.g. Schmitt trigger

Landscapes

  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To fix the threshold voltage for a Schmitt circuit using an MOS transistor, by lowering forcibly the voltage at the transistor joint while the input voltage varies from zero volt through the threshold voltage. CONSTITUTION:The MOS transistor TR2 and TR3 are turned off when the input voltage VIN is at zero volt, and voltages V1 and V2 are increased by TR1 and TR4 to be set at VDD-Vt1 and VDD-Vt1-Vt4 (Vtn: threshold voltage of TRn). Thus a TR7 is turned on and the voltage V1 becomes equal to the voltage V3, and the current flows constantly through Trs 1, 6 and 7 to avoid the floating state of the voltage V1 as well as to prevent the effect of the noise or leakage. When the input voltage VIN reaches Vt3 from zero, the current flows to TRs 3 and 4. Thus the voltage V2 drops and the voltage V1 is fixed. With further increase of the voltage VIN, the TR2 is turned on to set the V1 and V2 at a level close to the earth potential.
JP4109081A 1981-03-19 1981-03-19 Schmitt circuit Pending JPS57154930A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4109081A JPS57154930A (en) 1981-03-19 1981-03-19 Schmitt circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4109081A JPS57154930A (en) 1981-03-19 1981-03-19 Schmitt circuit

Publications (1)

Publication Number Publication Date
JPS57154930A true JPS57154930A (en) 1982-09-24

Family

ID=12598767

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4109081A Pending JPS57154930A (en) 1981-03-19 1981-03-19 Schmitt circuit

Country Status (1)

Country Link
JP (1) JPS57154930A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0669985U (en) * 1993-03-15 1994-09-30 フェンス工業株式会社 Luminous indicator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0669985U (en) * 1993-03-15 1994-09-30 フェンス工業株式会社 Luminous indicator

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