GB2008879A - Relaxation oscillator - Google Patents

Relaxation oscillator

Info

Publication number
GB2008879A
GB2008879A GB7841751A GB7841751A GB2008879A GB 2008879 A GB2008879 A GB 2008879A GB 7841751 A GB7841751 A GB 7841751A GB 7841751 A GB7841751 A GB 7841751A GB 2008879 A GB2008879 A GB 2008879A
Authority
GB
United Kingdom
Prior art keywords
capacitor
voltage
fet
level
charge
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.)
Granted
Application number
GB7841751A
Other versions
GB2008879B (en
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Priority to US05/958,018 priority Critical patent/US4219787A/en
Publication of GB2008879A publication Critical patent/GB2008879A/en
Application granted granted Critical
Publication of GB2008879B publication Critical patent/GB2008879B/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
    • H03K4/501—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 the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator
    • H03K4/502—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 the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator the capacitor being charged from a constant-current source
    • 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

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)
  • Manipulation Of Pulses (AREA)
  • Dc-Dc Converters (AREA)

Abstract

In a relaxation oscillator having its frequency determined by the charge rate of a capacitor (C1), a switch means (12) is controlled through a field effect transistor (Q1) to discharge the capacitor at a predetermined charge level when channel current through the FET (Q1) is reduced as voltage across the capacitor approaches the voltage supply level (+ V). The charge rate of the capacitor (C1) is substantially unaffected by the FET (Q1) and substantially no power is drawn to control the switch means (12) while the capacitor is charging. A duty cycle output can also be accomplished from this oscillator without substantially affecting the low power attributes thereof. In effect, the level of charge on the capacitor (C1) is sensed indirectly from the difference between the voltage across it and the supply voltage (+ V) for the capacitor charging circuit (11), rather than directly from the voltage across the capacitor itself as in the prior art. The amplitude and frequency of the oscillations can thereby depend primarily on the supply voltage (+ V) rather than restrictively on the threshold voltage of the FET (Q1). <IMAGE>
GB7841751A 1977-11-25 1978-10-24 Relaxation oscillator Expired GB2008879B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/958,018 US4219787A (en) 1977-11-25 1978-11-06 Relaxation oscillator not restricted by FET threshold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4912677 1977-11-25

Publications (2)

Publication Number Publication Date
GB2008879A true GB2008879A (en) 1979-06-06
GB2008879B GB2008879B (en) 1982-05-19

Family

ID=10451243

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7841751A Expired GB2008879B (en) 1977-11-25 1978-10-24 Relaxation oscillator

Country Status (4)

Country Link
JP (1) JPS5482956A (en)
DE (1) DE2850933C3 (en)
FR (1) FR2410396A1 (en)
GB (1) GB2008879B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128715C2 (en) * 1981-07-21 1984-10-11 Telefunken electronic GmbH, 7100 Heilbronn Circuit arrangement
GB2146502B (en) * 1983-08-31 1987-07-01 Nat Semiconductor Corp Internal high voltage (vpp) rise control circuit
JPH01177505U (en) * 1988-05-24 1989-12-19
JP6852374B2 (en) 2016-12-07 2021-03-31 富士ゼロックス株式会社 Image processing equipment and programs

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533722Y2 (en) * 1971-11-26 1980-08-11
JPS4874772A (en) * 1971-12-29 1973-10-08
DE2450921C3 (en) * 1974-10-25 1981-10-15 Siemens AG, 1000 Berlin und 8000 München MOS integrated circuit arrangement for a pulse generator
US3995232A (en) * 1975-05-02 1976-11-30 National Semiconductor Corporation Integrated circuit oscillator
US4001722A (en) * 1975-05-19 1977-01-04 National Semiconductor Corporation Integrated circuit relaxation oscillator

Also Published As

Publication number Publication date
FR2410396B1 (en) 1984-01-20
DE2850933C3 (en) 1982-01-21
DE2850933B2 (en) 1981-05-21
GB2008879B (en) 1982-05-19
JPS6155808B2 (en) 1986-11-29
DE2850933A1 (en) 1979-05-31
FR2410396A1 (en) 1979-06-22
JPS5482956A (en) 1979-07-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee