GB1395163A - Voltage level responsive circuits - Google Patents

Voltage level responsive circuits

Info

Publication number
GB1395163A
GB1395163A GB4537071A GB4537071A GB1395163A GB 1395163 A GB1395163 A GB 1395163A GB 4537071 A GB4537071 A GB 4537071A GB 4537071 A GB4537071 A GB 4537071A GB 1395163 A GB1395163 A GB 1395163A
Authority
GB
United Kingdom
Prior art keywords
signal
threshold level
base
level
thresholding
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.)
Expired
Application number
GB4537071A
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.)
Gemalto Terminals Ltd
Original Assignee
Solartron Electronic Group 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 Solartron Electronic Group Ltd filed Critical Solartron Electronic Group Ltd
Priority to GB4537071A priority Critical patent/GB1395163A/en
Priority to FR7234020A priority patent/FR2155355A5/fr
Publication of GB1395163A publication Critical patent/GB1395163A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/20—Cathode-ray oscilloscopes
    • G01R13/22—Circuits therefor
    • G01R13/24—Time-base deflection circuits
    • 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
    • H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
    • H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
    • H03K3/2893—Bistables with hysteresis, e.g. Schmitt trigger
    • H03K3/2897—Bistables with hysteresis, e.g. Schmitt trigger with an input circuit of differential configuration

Abstract

1395163 Pulse thresholding circuits SOLARTRON ELECTRONIC GROUP Ltd 25 Sept 1972 [29 Sept 1971] 45370/71 Heading H3T In a circuit for thresholding a signal at the mid-level between its peak values, the threshold level is derived by alternately discharging a charge storage device through respective paths to the greater of erect and inverted versions of the difference between the signal and the threshold level, the latter being derived from one of the paths and being such that the discharge through the two paths is equal. In the time-base triggering circuit shown, the input signal from terminal 12 is applied to one input of a comparator TR3, TR4 and a threshold level is applied to the other so as to produce at the two collectors erect and inverted versions of the difference between the signal and the threshold level. These are used to discharge a capacitor C1 through the base-emitter diodes of TR5 and TR6 to whichever version is the larger. The voltage developed across R6 in response to the current in one discharge path is used after smoothing by C2, C3, R7 as the threshold level at a base of TR4 and the effect of this loop is to equalize the currents in TR5 and TR6 so that the mid-level is achieved. The threshold voltage is also applied to one input of a comparator TR1, TR2 to effect thresholding of the signal applied at 12 and the resulting output is squared in circuit 22 to produce a triggering signal for the time base generator 24. The voltage at the emitters of TR5 and TR6 represents the peak-to-peak amplitude of the signal and this may be used to cause the time base to free-run if the signal amplitude is below a given value.
GB4537071A 1971-09-29 1971-09-29 Voltage level responsive circuits Expired GB1395163A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4537071A GB1395163A (en) 1971-09-29 1971-09-29 Voltage level responsive circuits
FR7234020A FR2155355A5 (en) 1971-09-29 1972-09-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4537071A GB1395163A (en) 1971-09-29 1971-09-29 Voltage level responsive circuits

Publications (1)

Publication Number Publication Date
GB1395163A true GB1395163A (en) 1975-05-21

Family

ID=10436968

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4537071A Expired GB1395163A (en) 1971-09-29 1971-09-29 Voltage level responsive circuits

Country Status (2)

Country Link
FR (1) FR2155355A5 (en)
GB (1) GB1395163A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440894A2 (en) * 1989-12-30 1991-08-14 Robert Bosch Gmbh Trigger circuit with self-adjusting reference value

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57206125A (en) * 1981-06-15 1982-12-17 Toshiba Corp Hysteresis circuit
ATE129108T1 (en) * 1990-07-04 1995-10-15 Siemens Ag CIRCUIT ARRANGEMENT FOR A LEVEL CONVERTER FOR CONVERTING TTL INPUT SIGNALS INTO ECL OUTPUT SIGNALS.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440894A2 (en) * 1989-12-30 1991-08-14 Robert Bosch Gmbh Trigger circuit with self-adjusting reference value
EP0440894A3 (en) * 1989-12-30 1991-10-16 Robert Bosch Gmbh Trigger circuit with self-adjusting reference value

Also Published As

Publication number Publication date
FR2155355A5 (en) 1973-05-18

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees