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GB953035A - Improvements in or relating to time-base circuits employing transistors - Google Patents

Improvements in or relating to time-base circuits employing transistors

Info

Publication number
GB953035A
GB953035A GB2470462A GB2470462A GB953035A GB 953035 A GB953035 A GB 953035A GB 2470462 A GB2470462 A GB 2470462A GB 2470462 A GB2470462 A GB 2470462A GB 953035 A GB953035 A GB 953035A
Authority
GB
United Kingdom
Prior art keywords
voltage
transistor
capacitor
oscillator
sawtooth
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
GB2470462A
Inventor
Brian Ernest Attwood
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.)
Philips Components Ltd
Original Assignee
Mullard 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
Priority to BE624429D priority Critical patent/BE624429A/xx
Priority to NL284944D priority patent/NL284944A/xx
Priority to GB30157/61A priority patent/GB935722A/en
Application filed by Mullard Ltd filed Critical Mullard Ltd
Priority to GB2470462A priority patent/GB953035A/en
Priority to US233670A priority patent/US3229151A/en
Priority to DEN22297A priority patent/DE1203395B/en
Priority to FR914224A priority patent/FR1337740A/en
Priority to GB26184/63A priority patent/GB972757A/en
Publication of GB953035A publication Critical patent/GB953035A/en
Priority to NL6407273A priority patent/NL6407273A/xx
Priority to DE19641489164 priority patent/DE1489164A1/en
Priority to US379260A priority patent/US3286105A/en
Priority to BE649976A priority patent/BE649976A/xx
Priority to FR980412A priority patent/FR86097E/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/80—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements multi-layer diodes
    • 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
    • H03K3/35—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
    • H03K4/50—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor
    • H03K4/54—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor using a single semiconductor device with positive feedback through a transformer, e.g. blocking oscillator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
    • H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor
    • H03K4/69—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as an amplifier
    • H03K4/72—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as an amplifier combined with means for generating the driving pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/83—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices with more than two PN junctions or with more than three electrodes or more than one electrode connected to the same conductivity region
    • H03K4/84—Generators in which the semiconductor device is conducting during the fly-back part of the cycle

Landscapes

  • Details Of Television Scanning (AREA)

Abstract

953,035. Transistor sawtooth circuits. MULLARD Ltd. June 27, 1962, No. 24704/62. Heading H3T. A field time-base circuit for television apparatus comprises a sawtooth oscillator using a semi-conductor device, periodically discharging a capacitor, the residual voltage across the capacitor during each flyback period being cancelled by a backing-off voltage induced into a winding in series with the discharge circuit. The oscillator is D.C. coupled to an output transistor hence the backing-off voltage clamps the base potential of the output transistor. Fig. 2 shows two capacitors C12, C13, charged via resistor R13 and periodically discharged via a blocking oscillator comprising transistor T1 and feed-back transformer Lb1, Lb2. The sawtooth voltage across the capacitors is passed via an optional emitter follower T2 to an amplifier T3 coupled to field deflection coils Ly via capacitor Cy. A flyback pulse induced into winding Lb3 cancels the residual voltage across the blocking oscillator T1 and clamps the base voltage of T3. Lb3 could alternatively be connected in the emitter circuit of T1. The frequency of the blocking oscillator T1 is stabilized by a negative-temperature coefficient resistor R2 as described in Specification 896,024. The output is linearized by feed-back via R16. Further feed-back may be provided via a capacitor and resistor (not shown) in series, connected between the emitter of T2 and the junction of C1, R1. Transistor T1 may be replaced by a controlled PNPN device fed from a stabilized voltage derived from T3 as described in Specification 924,260. Specification 935,722 also is referred to.
GB2470462A 1961-08-21 1962-06-27 Improvements in or relating to time-base circuits employing transistors Expired GB953035A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
BE624429D BE624429A (en) 1961-08-21
NL284944D NL284944A (en) 1961-08-21
GB30157/61A GB935722A (en) 1961-08-21 1961-08-21 Improvements in or relating to time-base circuits employing transistors
GB2470462A GB953035A (en) 1962-06-27 1962-06-27 Improvements in or relating to time-base circuits employing transistors
US233670A US3229151A (en) 1961-08-21 1962-10-29 Transistor field time base deflection circuit
DEN22297A DE1203395B (en) 1961-08-21 1962-10-30 Circuit for vertical magnetic beam deflection of an electron beam tube
FR914224A FR1337740A (en) 1961-08-21 1962-11-02 Vertical deflection circuit
GB26184/63A GB972757A (en) 1961-08-21 1963-07-02 Improvements in or relating to time-base circuits employing transistors
NL6407273A NL6407273A (en) 1961-08-21 1964-06-26
DE19641489164 DE1489164A1 (en) 1961-08-21 1964-06-27 Four-layer semiconductor and application of the same in a relaxation oscillator
US379260A US3286105A (en) 1961-08-21 1964-06-30 Time-base circuit employing four-layer semiconductor switching element having end layer divided into two sections
BE649976A BE649976A (en) 1961-08-21 1964-07-01
FR980412A FR86097E (en) 1961-08-21 1964-07-02 Vertical deflection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2470462A GB953035A (en) 1962-06-27 1962-06-27 Improvements in or relating to time-base circuits employing transistors

Publications (1)

Publication Number Publication Date
GB953035A true GB953035A (en) 1964-03-25

Family

ID=10215940

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2470462A Expired GB953035A (en) 1961-08-21 1962-06-27 Improvements in or relating to time-base circuits employing transistors

Country Status (1)

Country Link
GB (1) GB953035A (en)

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