GB682864A - Improvements relating to circuits for generating sawtooth waveforms - Google Patents

Improvements relating to circuits for generating sawtooth waveforms

Info

Publication number
GB682864A
GB682864A GB1641349A GB1641349A GB682864A GB 682864 A GB682864 A GB 682864A GB 1641349 A GB1641349 A GB 1641349A GB 1641349 A GB1641349 A GB 1641349A GB 682864 A GB682864 A GB 682864A
Authority
GB
United Kingdom
Prior art keywords
voltage
capacitor
saw
tooth
produced
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
GB1641349A
Inventor
Peter Frederic Thoma Stillwell
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB1641349A priority Critical patent/GB682864A/en
Priority to AU34783/50A priority patent/AU151221B1/en
Publication of GB682864A publication Critical patent/GB682864A/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
    • H03K4/90—Linearisation of ramp; Synchronisation of pulses

Abstract

682,864. Saw-tooth generating circuits. ELECTRIC & MUSICAL INDUSTRIES, Ltd. May 24, 1950 [June 21, 1949], No. 16413/49. Class 40 (vi). In a saw-tooth waveform generator of the type in which a capacitor is charged via a resistor from a constant voltage source and periodically rapidly discharged, the linearity of the long flank of the saw-tooth waveform is improved by providing in series with the capacitor and resistor a low impedance voltage source of substantially parabolic waveform. Fig. 1 shows a saw-tooth generator in which capacitor 1 is charged from a source 3 via a resistor 2 and periodically discharged via valve 4 when this valve is rendered conducting by positive-going pulses applied from source 5. The saw-tooth voltage produced across the capacitor which has an exponential curvature to its long flank is integrated by network 8, 9 to produce a low impedance voltage source of voltage (a) across cathode resistor 11. This voltage is thus effectively in series with the voltage across capacitor 1 and thus produces a linear flank to the saw-tooth waveform produced at terminal 13. Fig. 2 shows a modification in which the saw-tooth voltage produced across capacitor 1 is amplified in cathode follower 10 and the voltage produced across resistor 11 is integrated in network 14, 15 so that the parabolic voltage produced across capacitor 14 is effectively in series with the charging voltage source to capacitor 1 and a linear saw-tooth voltage is thus produced. Third order correction may be produced by feeding a voltage to capacitor 1 from the anode of valve 10 via resistor 17.
GB1641349A 1949-06-21 1949-06-21 Improvements relating to circuits for generating sawtooth waveforms Expired GB682864A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1641349A GB682864A (en) 1949-06-21 1949-06-21 Improvements relating to circuits for generating sawtooth waveforms
AU34783/50A AU151221B1 (en) 1949-06-21 1950-06-01 Improvements relating to circuits for generating sawtooth waveforms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1641349A GB682864A (en) 1949-06-21 1949-06-21 Improvements relating to circuits for generating sawtooth waveforms

Publications (1)

Publication Number Publication Date
GB682864A true GB682864A (en) 1952-11-19

Family

ID=10076880

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1641349A Expired GB682864A (en) 1949-06-21 1949-06-21 Improvements relating to circuits for generating sawtooth waveforms

Country Status (2)

Country Link
AU (1) AU151221B1 (en)
GB (1) GB682864A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908774A (en) * 1955-09-16 1959-10-13 Hals Per Jahrmann Cathode-follower for pulse operation
US3975647A (en) * 1974-06-06 1976-08-17 Keishin Matsumoto, Director-General, Agency of Industrial Science and Technology Bootstrap circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908774A (en) * 1955-09-16 1959-10-13 Hals Per Jahrmann Cathode-follower for pulse operation
US3975647A (en) * 1974-06-06 1976-08-17 Keishin Matsumoto, Director-General, Agency of Industrial Science and Technology Bootstrap circuit

Also Published As

Publication number Publication date
AU151221B1 (en) 1950-08-03

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