GB1528814A - Electrical signal generators - Google Patents

Electrical signal generators

Info

Publication number
GB1528814A
GB1528814A GB5037975A GB5037975A GB1528814A GB 1528814 A GB1528814 A GB 1528814A GB 5037975 A GB5037975 A GB 5037975A GB 5037975 A GB5037975 A GB 5037975A GB 1528814 A GB1528814 A GB 1528814A
Authority
GB
United Kingdom
Prior art keywords
frequency
counter
generator
range
change
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
GB5037975A
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.)
Aeroflex Burnham Ltd
Original Assignee
Racal Instruments 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 Racal Instruments Ltd filed Critical Racal Instruments Ltd
Priority to GB5037975A priority Critical patent/GB1528814A/en
Priority to FR7636697A priority patent/FR2335094A1/en
Priority to DE19762655138 priority patent/DE2655138A1/en
Priority to JP14827176A priority patent/JPS5296857A/en
Priority to US05/855,300 priority patent/US4147993A/en
Publication of GB1528814A publication Critical patent/GB1528814A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H03J5/0272—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

1528814 Frequency synthesizers RACAL INSTRUMENTS Ltd 28 Oct 1976 [9 Dec 1975] 50379/75 Heading H3A [Also in Division G4] A signal generator comprises an adjustable frequency generator e.g. a phase lock loop arrangement (Figs. la, 1b not shown), a control arrangement 160, 182 for adjustably pre-selecting the size of a desired step change in the generator output frequency without causing such change and an initiating device 162, 168 operative when activated to cause a step change in the output frequency. The generator arrangement includes a programmable divider 42 whose division ratio is define by the count of a counter 174. In response to the operation of a frequency change control 162, an up/down detector sets the counter 174 to count up or down and a device 178 is also enabled to open a gate 176 so that clock pulses are applied to the counter 174 and to a further counter 182 defining the step size and set by the control switches 82, 160. The gate 176 is closed when the counter 182 reaches zero count. A memory 190 and a single step unit 196 prevents the frequency generator going out of its control range. A range switch 82 enable selection of the desired output frequency range and interpolation between frequency steps in each range is also optionally obtainable. The generator output may also be amplitude or frequency modulated as in Figs. 1a, 1b (not shown).
GB5037975A 1975-12-09 1975-12-09 Electrical signal generators Expired GB1528814A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB5037975A GB1528814A (en) 1975-12-09 1975-12-09 Electrical signal generators
FR7636697A FR2335094A1 (en) 1975-12-09 1976-12-06 ELECTRIC SIGNAL GENERATOR
DE19762655138 DE2655138A1 (en) 1975-12-09 1976-12-06 ELECTRIC SIGNAL GENERATOR
JP14827176A JPS5296857A (en) 1975-12-09 1976-12-09 Electric signal generator
US05/855,300 US4147993A (en) 1975-12-09 1977-11-28 Electrical signal generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5037975A GB1528814A (en) 1975-12-09 1975-12-09 Electrical signal generators

Publications (1)

Publication Number Publication Date
GB1528814A true GB1528814A (en) 1978-10-18

Family

ID=10455703

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5037975A Expired GB1528814A (en) 1975-12-09 1975-12-09 Electrical signal generators

Country Status (4)

Country Link
JP (1) JPS5296857A (en)
DE (1) DE2655138A1 (en)
FR (1) FR2335094A1 (en)
GB (1) GB1528814A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188804A (en) * 1986-04-04 1987-10-07 Plessey Co Plc Frequency synthesiser
US4862109A (en) * 1986-04-04 1989-08-29 Plessey Overseas Limited Processor controlled phase locked loop multi-band frequency synthesizer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023371A (en) * 1958-03-07 1962-02-27 Thompson Ramo Wooldridge Inc Precision variable frequency generator
DE1591814C3 (en) * 1967-09-13 1982-03-18 Wandel & Goltermann Gmbh & Co, 7412 Eningen Frequency decade generator
DE1932764B2 (en) * 1969-06-27 1970-12-17 Siemens Ag Circuit for the optional quasi-continuous tuning of a decadic frequency synthesizer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188804A (en) * 1986-04-04 1987-10-07 Plessey Co Plc Frequency synthesiser
US4862109A (en) * 1986-04-04 1989-08-29 Plessey Overseas Limited Processor controlled phase locked loop multi-band frequency synthesizer
GB2188804B (en) * 1986-04-04 1989-12-28 Plessey Co Plc Frequency synthesiser

Also Published As

Publication number Publication date
JPS5296857A (en) 1977-08-15
DE2655138A1 (en) 1977-06-23
FR2335094B1 (en) 1982-01-08
FR2335094A1 (en) 1977-07-08

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Legal Events

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