GB1333534A - Variable-freqeuncy generator - Google Patents
Variable-freqeuncy generatorInfo
- Publication number
- GB1333534A GB1333534A GB964572A GB964572A GB1333534A GB 1333534 A GB1333534 A GB 1333534A GB 964572 A GB964572 A GB 964572A GB 964572 A GB964572 A GB 964572A GB 1333534 A GB1333534 A GB 1333534A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- frequency
- divider
- counter
- signal
- 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
Links
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 239000013642 negative control Substances 0.000 abstract 1
- 239000013641 positive control Substances 0.000 abstract 1
Classifications
-
- 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
- H03L7/187—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 using means for coarse tuning the voltage controlled oscillator of the loop
- H03L7/189—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 using means for coarse tuning the voltage controlled oscillator of the loop comprising a D/A converter for generating a coarse tuning voltage
-
- 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
- H03L7/197—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 numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division
- H03L7/1972—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 numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division for reducing the locking time interval
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
1333534 Frequency generators THOMSONCSF 1 March 1972 [2 March 1971] 9645/72 Heading H3A A frequency generator for generating frequencies of the form NFr, where N is a variable integer and Fr a stable reference frequency, comprises a stable device for delivering the frequency Fr and a second stable frequency k.Fr, where k is an integer greater than 1, a variable-frequency oscillator of output frequency F, a main circuit comprising dividing means for deriving from the oscillator output a signal of frequency F/N and also comprising means for locking the frequency F/N to the frequency Fr, an auxiliary circuit, comprising dividing means for deriving from the output signal F a signal of frequency F/q, q being equal to N/k + e, where e is zero or small as compared with N/k, and also comprising further means for delivering an error signal proportional to the algebraical difference between the duration of the periods respectively corresponding to the frequencies F/q and k.Fr, and control means for, for each frequency N.Fr to be generated, causing the auxiliary and main circuits to operate successively. In an embodiment, the desired frequency F appears at output 20, Fig. 1, of variable frequency oscillator 1, the frequency of which is controlled by control circuit 6. A stabilized reference frequency oscillator 7 is also provided. The output from oscillator 1 is also fed to decimally-controlled divider 3, while oscillator 7 feeds reference divider 8 which comprises two seriesconnected counters whose outputs are alternately connected by a switch to a bi-stable circuit providing the reference divider output; the first counter produces one output pulse for Z/2 pulses from oscillator 7, while the second counter produces one output pulse for k pulses from the first counter. A comparator 5 provides an output 55 to control circuit 6 and has a first input derived from divider 3 over monostable trigger 4, and two further inputs 51, 52 respectively derived from divider 8 directly and via a monostable trigger 9. The division ratio of divider 3 is set up by selecting device 13 either via electronic switch 11 or switch 12, via OR gates (shown as dots): device 13 operates under control of remote control receiver 14, outputs 41 of which define the frequency to be set up while output 40 provides a synchronizing output which is applied to two-output bi-stable trigger 15, to OR gate 2 and to a reset input of a counter 18. OR gate 2 provides an output resetting dividers 3, 23. The output from monostable trigger 4 also energizes a further monostable trigger 16, the output from which is fed to counter 18 and OR gate 2. Selecting device 13 produces a third output which is converted to analogue form in digital-to-analogue converter 10. The control circuit 6 comprises an addition circuit with storage properties which produces the sum of the output signal from converter 10 and the signal resulting from integration of successive output signals from comparator 5; it is constituted by two AND gates 53, 54, Fig. 2, inverter 56 and resistor 57, terminal 60 being coupled by capacitor 62, 65 to the base of emitter-follower 63 which provides the output at terminal 61. Operation.-Upon selection of a new frequency a sync. pulse, on terminal 40, occurring at time t 0 (Fig. 3) resets counter 18 and also, via OR gate 2, dividers 3, 8; it also trips trigger circuit 15 whereby AND gate 17 is blocked, switch 12 opened and switch 11 closed, so that divider 3 is given the division ratio g=N/K. It causes the production of the frequency kFr at the output of reference divider 8. Selecting device 13 supplies an input to converter 10 which applies a control signal to oscillator 1 whereby it produces a frequency (Fe+#F) approximately equal to the desired frequency Fe. Let α be the absolute maximum value of #F/Fe and let L=α#, where L is the duration of the quasistable state of each of the monostable circuits 4, 9, 16. The variable divider 3 produces at time t<SP>1</SP> a short pulse which is converted into a pulse I 1 of length L by trigger circuit 4; the time t<SP>1</SP>-t 0 = 1/(Fe+#F). The pulse I 1 is applied to the monostable trigger 16 which, having an output differentiator, supplies a short pulse at time L following the trailing edge of I 1 , i.e. at time t<SP>1</SP> + 2L=t 1 ; this pulse is supplied through gate 17 to OR gate 2 to reset dividers 3, 8, and also to counter 18. At output 51 there appears between time t 0 and t 1 a signal R 1 , whereas, due to monostable trigger 9, there appears at input 52 a signal R 1 <SP>1</SP>: pairs of simultaneous signals obtained in the same fashion as R 1 and R 1 <SP>1</SP> are applied to the respective inputs of comparator 5 until counter 18 has been supplied at input 28 with the number of pulses corresponding to the desired number m of pairs of simultaneous signals; whereupon counter 18 supplies a signal which trips trigger circuit 15 into its other state. If m= 1 counter 18 reduces to a single trigger circuit which trips trigger circuit 15 at instant t 1 . When trigger circuit 15 is tripped, gate 17 is blocked, inhibiting feeding of counter 18, and also supply of reset signals to dividers 3, 8; switch 11 is blocked and switch 12 unblocked, changing the ratio of divider 3 to N, and tripping the switch in divider 8, so as to produce the frequency Fr at its output. Consequently after instant t 1 , the variable divider 3 supplies short pulses of frequency F/N which are converted by trigger circuit 4 to pulses I 2 of length L; reference divider 8 supplies a rectangular waveform R 2 of frequency Fr and periodicity Tr, while trigger circuit 9 supplies a signal R 2 <SP>1</SP>. If then #F = O, t<SP>1</SP> = (t 0 + #) and the comparator 5 will produce no output; if #F is positive t<SP>1</SP><(t 0 + #) and the comparator produces a positive control output, whereas if #F is negative t<SP>1</SP>>(t 0 +#) and a negative control signal is produced.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7107133A FR2128056B1 (en) | 1971-03-02 | 1971-03-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1333534A true GB1333534A (en) | 1973-10-10 |
Family
ID=9072749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB964572A Expired GB1333534A (en) | 1971-03-02 | 1972-03-01 | Variable-freqeuncy generator |
Country Status (9)
Country | Link |
---|---|
BE (1) | BE780113A (en) |
DE (1) | DE2209385C2 (en) |
ES (1) | ES400258A1 (en) |
FR (1) | FR2128056B1 (en) |
GB (1) | GB1333534A (en) |
IT (1) | IT948767B (en) |
NL (1) | NL7202601A (en) |
NO (1) | NO133052C (en) |
SE (1) | SE369651B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5202906A (en) * | 1986-12-23 | 1993-04-13 | Nippon Telegraph And Telephone Company | Frequency divider which has a variable length first cycle by changing a division ratio after the first cycle and a frequency synthesizer using same |
US5220684A (en) * | 1990-01-29 | 1993-06-15 | Kabushiki Kaisha Toshiba | Channel selecting circuit |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3939709A1 (en) * | 1989-12-01 | 1991-06-06 | Bosch Gmbh Robert | METHOD FOR TUNING A RADIO TRANSMITTER AND / OR RECEIVER |
DE4017491C2 (en) * | 1990-05-31 | 2002-05-08 | Siemens Ag | tuning |
JP3033654B2 (en) * | 1993-08-23 | 2000-04-17 | 日本電気株式会社 | PLL frequency synthesizer |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1067454A (en) * | 1963-06-21 | 1967-05-03 | Plessey Uk Ltd | Improvements in or relating to controlled frequency electrical oscillation generators |
US3588732A (en) * | 1969-01-16 | 1971-06-28 | Collins Radio Co | Frequency synthesizer |
-
1971
- 1971-03-02 FR FR7107133A patent/FR2128056B1/fr not_active Expired
-
1972
- 1972-02-28 DE DE19722209385 patent/DE2209385C2/en not_active Expired
- 1972-02-28 NO NO59972A patent/NO133052C/no unknown
- 1972-02-29 IT IT4863272A patent/IT948767B/en active
- 1972-02-29 NL NL7202601A patent/NL7202601A/xx not_active Application Discontinuation
- 1972-02-29 ES ES400258A patent/ES400258A1/en not_active Expired
- 1972-03-01 GB GB964572A patent/GB1333534A/en not_active Expired
- 1972-03-01 SE SE261272A patent/SE369651B/xx unknown
- 1972-03-02 BE BE780113A patent/BE780113A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5202906A (en) * | 1986-12-23 | 1993-04-13 | Nippon Telegraph And Telephone Company | Frequency divider which has a variable length first cycle by changing a division ratio after the first cycle and a frequency synthesizer using same |
US5220684A (en) * | 1990-01-29 | 1993-06-15 | Kabushiki Kaisha Toshiba | Channel selecting circuit |
Also Published As
Publication number | Publication date |
---|---|
FR2128056B1 (en) | 1974-04-26 |
IT948767B (en) | 1973-06-11 |
NO133052C (en) | 1976-02-25 |
SE369651B (en) | 1974-09-09 |
DE2209385A1 (en) | 1972-09-07 |
BE780113A (en) | 1972-07-03 |
NO133052B (en) | 1975-11-17 |
NL7202601A (en) | 1972-09-05 |
FR2128056A1 (en) | 1972-10-20 |
ES400258A1 (en) | 1975-01-01 |
DE2209385C2 (en) | 1981-12-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |