GB2007452A - Hysteresis switching circuit - Google Patents

Hysteresis switching circuit

Info

Publication number
GB2007452A
GB2007452A GB7842444A GB7842444A GB2007452A GB 2007452 A GB2007452 A GB 2007452A GB 7842444 A GB7842444 A GB 7842444A GB 7842444 A GB7842444 A GB 7842444A GB 2007452 A GB2007452 A GB 2007452A
Authority
GB
United Kingdom
Prior art keywords
circuit
amplifying transistors
current
current mirror
threshold switch
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
GB7842444A
Other versions
GB2007452B (en
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB2007452A publication Critical patent/GB2007452A/en
Application granted granted Critical
Publication of GB2007452B publication Critical patent/GB2007452B/en
Expired 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
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/018—Coupling arrangements; Interface arrangements using bipolar transistors only
    • H03K19/01806—Interface arrangements
    • H03K19/01818—Interface arrangements for integrated injection logic (I2L)
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/30—Modifications for providing a predetermined threshold before switching
    • 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
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/018—Coupling arrangements; Interface arrangements using bipolar transistors only
    • H03K19/01806—Interface arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Electronic Switches (AREA)
  • Manipulation Of Pulses (AREA)
  • Amplifiers (AREA)
  • Logic Circuits (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Semiconductor Integrated Circuits (AREA)

Abstract

A circuit arrangement for monolithic integrated circuit threshold switch having particular, but not exclusive, application in providing a switching current for an integrated injection logic circuit. In order to avoid the problems of a threshold switch being operated by spurious pulses, the switching range of the threshold circuit is automatically adapted for the supply voltage by adjusting the turn-on voltage so that it is always a fixed voltage difference or interval below the supply voltage irrespective of the variations in the operating voltage. In a typical embodiment, Figure 2, the threshold switch comprises two amplifying transistors (T7, T8) connected in series, a constant current circuit connected to a first current mirror circuit (T1, T2) and via a first diode (D1) to a second current mirror circuit (T3, T4 and T5) which supplies current to the collectors of the two amplifying transistors (T7, T8). The base of a first (T7) of the amplifying transistors is connected to an output of the first current mirror which is connected to an input (E), and, via a second diode (D2), to a second (T8) of the amplifying transistors. The first and second diodes (D1 and D2) determine the lower and upper switching thresholds, respectively. <IMAGE>
GB7842444A 1977-11-02 1978-10-30 Circuit arrangement for a monolithic integrated theresholdswitsh Expired GB2007452B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772748967 DE2748967C2 (en) 1977-11-02 1977-11-02 Circuit arrangement for a monolithically integrated threshold switch

Publications (2)

Publication Number Publication Date
GB2007452A true GB2007452A (en) 1979-05-16
GB2007452B GB2007452B (en) 1982-04-15

Family

ID=6022812

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7842444A Expired GB2007452B (en) 1977-11-02 1978-10-30 Circuit arrangement for a monolithic integrated theresholdswitsh

Country Status (5)

Country Link
JP (1) JPS589608B2 (en)
CA (1) CA1128149A (en)
DE (1) DE2748967C2 (en)
FR (1) FR2408244A1 (en)
GB (1) GB2007452B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931901A1 (en) * 1979-08-07 1981-02-26 Licentia Gmbh Monolithic integrated logic threshold circuit - includes two differential amplifiers with paired transistors of complementary conduction type
JPS56120206A (en) * 1980-02-27 1981-09-21 Nec Corp Transistor circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2309084A1 (en) * 1975-04-22 1976-11-19 Radiotechnique Compelec THRESHOLD DEVICE FOR INTEGRATED LOGIC CIRCUITS

Also Published As

Publication number Publication date
DE2748967B1 (en) 1979-01-25
JPS5472946A (en) 1979-06-11
DE2748967C2 (en) 1983-01-13
FR2408244A1 (en) 1979-06-01
GB2007452B (en) 1982-04-15
FR2408244B1 (en) 1983-10-07
JPS589608B2 (en) 1983-02-22
CA1128149A (en) 1982-07-20

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19921030