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SE8306584L - FREQUENCY PARTS CIRCUIT - Google Patents

FREQUENCY PARTS CIRCUIT

Info

Publication number
SE8306584L
SE8306584L SE8306584A SE8306584A SE8306584L SE 8306584 L SE8306584 L SE 8306584L SE 8306584 A SE8306584 A SE 8306584A SE 8306584 A SE8306584 A SE 8306584A SE 8306584 L SE8306584 L SE 8306584L
Authority
SE
Sweden
Prior art keywords
unit
frequency
output
control signal
counter
Prior art date
Application number
SE8306584A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE8306584D0 (en
Inventor
H R Chivers
Original Assignee
Grundy & Partners 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 Grundy & Partners Ltd filed Critical Grundy & Partners Ltd
Publication of SE8306584D0 publication Critical patent/SE8306584D0/en
Publication of SE8306584L publication Critical patent/SE8306584L/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
    • H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses
    • H03K23/662—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses by adding or suppressing pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
    • H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses
    • H03K23/667—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses by switching the base during a counting cycle

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

A frequency divider circuit allows a desired long-term output frequency (with acceptable short-term deviations) to be generated from a master crystal oscillating at a higher frequency. A digital monostable divider unit D1 is connected in cascade with another such unit D2 and is supplied with a stable oscillator-controlled frequency input at I. The unit D1 has a period of N cycles, providing the major frequency division component, and the unit D2 provides the desired lower output frequency at O and is controllable for alternative switching after 1 or 3 cycles instead of the normal 2, the sum of the periods (N+2) representing the basic division ratio of the circuit. The output O is connected to the input i of a digital M counter which resets automatically after a count of M, when an output "modify" signal from an output o of the counter is applied at m to the divider unit D2. This signal renders operative a control signal applied to a fast/slow control signal input c1 of the unit D2 so that this unit switches after 1 or 3 cycles, instead of the basic 2, according to the value of the control signal. The M counter is programmable by a programme control signal at c2, so that the value of M can be varied to vary the long-term output frequency. <IMAGE>
SE8306584A 1982-12-04 1983-11-29 FREQUENCY PARTS CIRCUIT SE8306584L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08234655A GB2132047A (en) 1982-12-04 1982-12-04 Frequency divider circuits

Publications (2)

Publication Number Publication Date
SE8306584D0 SE8306584D0 (en) 1983-11-29
SE8306584L true SE8306584L (en) 1984-06-05

Family

ID=10534752

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8306584A SE8306584L (en) 1982-12-04 1983-11-29 FREQUENCY PARTS CIRCUIT

Country Status (3)

Country Link
DE (1) DE3341978A1 (en)
GB (1) GB2132047A (en)
SE (1) SE8306584L (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1396569A (en) * 1971-10-18 1975-06-04 Adret Electronique Variable-ratio electronic counter-divider
JPS5113279A (en) * 1974-07-11 1976-02-02 Suwa Seikosha Kk
US4053739A (en) * 1976-08-11 1977-10-11 Motorola, Inc. Dual modulus programmable counter
DE2910565C3 (en) * 1979-03-17 1981-10-08 Deutsche Itt Industries Gmbh, 7800 Freiburg Measuring or operating circuit for a switchable frequency divider
JPS5718129A (en) * 1980-07-07 1982-01-29 Nec Corp Pulse swallow frequency divider
GB2098372A (en) * 1981-05-08 1982-11-17 Wright Peter Thompson Improvements in television circuits

Also Published As

Publication number Publication date
GB2132047A (en) 1984-06-27
DE3341978A1 (en) 1984-06-07
SE8306584D0 (en) 1983-11-29

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Legal Events

Date Code Title Description
NAV Patent application has lapsed

Ref document number: 8306584-7

Effective date: 19850726