IE41787B1 - Oscillator circuit - Google Patents

Oscillator circuit

Info

Publication number
IE41787B1
IE41787B1 IE174075A IE174075A IE41787B1 IE 41787 B1 IE41787 B1 IE 41787B1 IE 174075 A IE174075 A IE 174075A IE 174075 A IE174075 A IE 174075A IE 41787 B1 IE41787 B1 IE 41787B1
Authority
IE
Ireland
Prior art keywords
oscillator
cmos
gate
output
amplifier
Prior art date
Application number
IE174075A
Other versions
IE41787L (en
Original Assignee
Int Standard Electric 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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of IE41787L publication Critical patent/IE41787L/en
Publication of IE41787B1 publication Critical patent/IE41787B1/en

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
    • H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
    • H03K3/354—Astable circuits
    • 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
    • H03K3/027—Generators characterised by the type of circuit or by the means used for producing pulses by the use of logic circuits, with internal or external positive feedback
    • H03K3/03—Astable circuits

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

1486220 Semi-conductor oscillator STANDARD TELEPHONES & CABLES Ltd 19 Aug 1975 [29 Aug 1974] 37766/74 Heading H3T In an oscillator with positive feedback via a frequency determining L-C network, and also with a resistive feedback loop, the amplifier comprises a CMOS gate or inverter biased to work in its linear mode. IC1a may be a NAND or NOR gate or inverter with feedback resistor R1 setting the bias for linear working; L, C1, C2, C4 form the frequency determining network; R2 and C2 may in some applications be omitted. A second similar gate or inverter 101b, preferably integrated with the first, may form an output buffer. The oscillator may be used in telephone push-button subsets.

Description

This invention relates to electrical oscillator circuits, and in particular to oscillators in which the active element is a CMOS device.
According to the invention there is provided an oscillator circuit whose active element is a linear amplifier formed hy a complementary metal oxide silicon (CMOS) gate or CMOS inverter so biased as to act as a linear amplifier, a resistive feedback loop coupled between the input and the output of the amplifier, and a frequency determining inductive-capacitive feedback loop adapted to provide positive feedback from the output to the input of the amplifier at the oscillator frequency.
An embodiment of the invention will now be described with reference to the 10 accompanying drawing which shows an oscillator arrangement employing a CMOS device as the active element.
The circuit includes an amplifier ICIa, a frequency determining feedback network comprising inductor L and capacitors Cl, C2, and C4, and an output buffer ICIb. The amplifier and the buffer may advantageously be contained in a single integrated circuit package.
ICIa is a CMOS NOR or NAND gate or an inverting element which is biased via resistor Rl connected between the input and the output of the gate. The output buffer circuit ICIb is also a CMOS NOR or NAND gate or CMOS inverting element.
Both CMOS inverters or gates are operated within their linear range.
The oscillator circuit has particular application in push-button telephone -241787 subsets or other apparatus which employs CMOS circuitry. For example the circuit may be employed as a tone generator, a waveform generator or a clock oscillator. In some applications the resistor R2 and the capacitor C2 may be omitted from the circuit.

Claims (5)

1. An oscillator circuit whose active element is a linear amplifier formed by a complementary metal oxide silicon (CMOS) gate or CMOS inverter so biased as to act as a linear amplifier, a resistive feedback loop coupled between the input 5 and the output of the amplifier, and a frequency determining inductive-capacitive feedback loop adapted to provide positive feedback from the output to the input of the amplifier at the oscillator frequency.
2. An oscillator circuit as claimed in claim 1, and wherein an output buffer for the oscillator has its input connected to an output from the linear amplifier of 10 the oscillator, and wherein the output buffer is formed by a CMOS gate or CMOS inverter biased so that it acts as a linear amplifier.
3. A circuit as claimed in claim 1, and in which the first and second CMOS gates or CMOS inverters are contained in a single integrated circuit package.
4. An oscillator circuit substantially as described herein with reference to 15 the accompanying drawing.
5. A telephone subset when fitted with one or more oscillator circuits as claimed in any one of the preceding claims.
IE174075A 1974-08-29 1975-08-05 Oscillator circuit IE41787B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3776674A GB1486220A (en) 1974-08-29 1974-08-29 Oscillator circuit

Publications (2)

Publication Number Publication Date
IE41787L IE41787L (en) 1976-02-29
IE41787B1 true IE41787B1 (en) 1980-03-26

Family

ID=10398866

Family Applications (1)

Application Number Title Priority Date Filing Date
IE174075A IE41787B1 (en) 1974-08-29 1975-08-05 Oscillator circuit

Country Status (4)

Country Link
FR (1) FR2283580A1 (en)
GB (1) GB1486220A (en)
HK (1) HK23278A (en)
IE (1) IE41787B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272736A (en) * 1979-06-11 1981-06-09 Motorola, Inc. Start stop oscillator having fixed starting phase
JP2519703B2 (en) * 1987-02-04 1996-07-31 株式会社東芝 Oscillator circuit

Also Published As

Publication number Publication date
GB1486220A (en) 1977-09-21
HK23278A (en) 1978-05-12
FR2283580B1 (en) 1980-12-19
IE41787L (en) 1976-02-29
FR2283580A1 (en) 1976-03-26

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