GB970320A - Improvements in or relating to saw-tooth waveform generators - Google Patents

Improvements in or relating to saw-tooth waveform generators

Info

Publication number
GB970320A
GB970320A GB3723361A GB3723361A GB970320A GB 970320 A GB970320 A GB 970320A GB 3723361 A GB3723361 A GB 3723361A GB 3723361 A GB3723361 A GB 3723361A GB 970320 A GB970320 A GB 970320A
Authority
GB
United Kingdom
Prior art keywords
transistor
capacitor
resistor
constant current
positive feedback
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
GB3723361A
Inventor
Anthony Norman Heightman
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB3723361A priority Critical patent/GB970320A/en
Publication of GB970320A publication Critical patent/GB970320A/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
    • H03K4/48—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

Landscapes

  • Details Of Television Scanning (AREA)
  • Dc-Dc Converters (AREA)

Abstract

970,320. Transistor sawtooth circuits. MARCONI CO. Ltd. June 21, 1962 [Oct. 17, 1961], No. 37233/61. Heading H3T. A sawtooth generator comprises a capacitor charged via a constant current transistor and discharged via a further transistor, the linearity being controlled by positive feedback. As shown, capacitor 10 is charged via transistor 1 having a degenerative emitter resistor 5 so as to pass approximately constant current and periodically discharged by transistor 2. Positive feedback is taken from an adjustable resistor in the collector circuit of an emitter follower 3. The resistor may be adjusted to provide a linear waveform or one with an upward curvature at the output 13. The output impedance may be zero or even negative. A potential divider 18, 19, 20 is provided to ensure that sufficient charge is present in capacitor 10 at the beginning of each sweep for linear operation of transistor 3. Components 19, 20 may be replaced by a Zener or conventional diode (Fig. 5, not shown).
GB3723361A 1961-10-17 1961-10-17 Improvements in or relating to saw-tooth waveform generators Expired GB970320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3723361A GB970320A (en) 1961-10-17 1961-10-17 Improvements in or relating to saw-tooth waveform generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3723361A GB970320A (en) 1961-10-17 1961-10-17 Improvements in or relating to saw-tooth waveform generators

Publications (1)

Publication Number Publication Date
GB970320A true GB970320A (en) 1964-09-16

Family

ID=10394841

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3723361A Expired GB970320A (en) 1961-10-17 1961-10-17 Improvements in or relating to saw-tooth waveform generators

Country Status (1)

Country Link
GB (1) GB970320A (en)

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