GB883442A - Improvements in or relating to frequency divider circuit arrangements using transistors - Google Patents

Improvements in or relating to frequency divider circuit arrangements using transistors

Info

Publication number
GB883442A
GB883442A GB856659A GB856659A GB883442A GB 883442 A GB883442 A GB 883442A GB 856659 A GB856659 A GB 856659A GB 856659 A GB856659 A GB 856659A GB 883442 A GB883442 A GB 883442A
Authority
GB
United Kingdom
Prior art keywords
transistor
conducting
capacitor
circuit
resistor
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
GB856659A
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh GmbH
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 Fernseh GmbH filed Critical Fernseh GmbH
Publication of GB883442A publication Critical patent/GB883442A/en
Expired 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
    • H03K3/26—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
    • H03K3/282—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 astable
    • H03K3/2823—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 astable using two active transistor of the same conductivity type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/00006—Changing the frequency

Abstract

883,442. Transistor pulse frequency-dividing circuits. FERNSEH G.m.b.H. March 12, 1959 [March 12, 1958], No. 8566/59. Class 40(6). A pulse frequency divider comprises two transistors 11, 21 reciprocally coupled through series resistor-capacitor combinations 16, 14 and 26, 24 to operate as a free-running multivibrator circuit, the junctions of the resistor 16 and capacitor 14 and of the resistor 26 and capacitor 24 being connected through diodes 9, 10 respectively to the output of a differentiating circuit comprising capacitor 7 and resistor 8 to the input of which the rectangular-pulse waveform whose frequency is to be divided is applied. Assuming, for example, that transistor 11 is conducting and bottomed while transistor 21 is non-conducting, negative spikes arising from the differentiated input waveform V1 will be applied through diode 9 and capacitor 14 to the base electrode of transistor 21; no pulses are passed by diode 10 which is blocked off by the large negative potential appearing at the collector electrode of transistor 21. Since transistor 21 is cut off, its base is at a positive potential which is decaying exponentially towards -E 1 ; when it falls to a value such that the application of a negative spike reduces the base potential to zero, transistor 21 conducts and transistor 11 is cut off owing to the cumulative effect of the positive feedback between the two transistors. The base electrode of transistor 11 is now at an exponentially decaying positive potential and negative spikes are applied thereto through the diode 10 and capacitor 24 until its potential reaches such a value that the spike is able to cause transistor 11 to conduct whereupon transistor 21 is rendered non-conducting once more. In the arrangement illustrated the component values are so chosen in relation to the applied input voltage waveform that transistor 21 remains non-conducting for the period covered by three negative voltage spikes while transistor 11 remains non-conducting for a period covered by two such spikes so that the circuit effects an overall frequency-dividing ratio of 5. In the circuit illustrated starting is ensured by switching on the collector voltage -E before the base bias voltage -E1. In an alternative arrangement, Fig. 5 (not shown), the resistor 5 is returned to a tapping point on the collector resistance 15 to provide some asymmetry in the circuit and thereby ensure starting. Fig. 1 shows a circuit not falling within the scope of the invention comprising a freerunning multivibrator to which the input pulse waveform is applied through capacitors 2 and 3 which are chosen to have such values in relation to the resistors 4, 5 that differentiated pulses appear at the bases of the transistors 11, 21, these being amplified by whichever transistor is conducting and applied to the base of non-conductive transistor to control the instant at which it commences conducting.
GB856659A 1958-03-12 1959-03-12 Improvements in or relating to frequency divider circuit arrangements using transistors Expired GB883442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF25231A DE1051325B (en) 1958-03-12 1958-03-12 Self-oscillating transistor multivibrator as a frequency divider

Publications (1)

Publication Number Publication Date
GB883442A true GB883442A (en) 1961-11-29

Family

ID=7091540

Family Applications (1)

Application Number Title Priority Date Filing Date
GB856659A Expired GB883442A (en) 1958-03-12 1959-03-12 Improvements in or relating to frequency divider circuit arrangements using transistors

Country Status (4)

Country Link
DE (1) DE1051325B (en)
FR (1) FR1217475A (en)
GB (1) GB883442A (en)
NL (1) NL237031A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183454A (en) * 1961-04-24 1965-05-11 Autophon Ag Circuit for providing sequences of pulses and intervals
DE1174832B (en) * 1962-08-31 1964-07-30 Siemens Ag Monostable multivibrator for generating an output pulse with a pulse duration that depends on the amplitude of a trigger pulse
DE1208339B (en) * 1962-12-22 1966-01-05 Bosch Gmbh Robert Monostable multivibrator
DE102004059535B4 (en) * 2004-12-09 2007-12-06 Infineon Technologies Ag frequency divider

Also Published As

Publication number Publication date
NL237031A (en)
DE1051325B (en) 1959-02-26
FR1217475A (en) 1960-05-04

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