JPS5566147A - Frequency synthesizer - Google Patents
Frequency synthesizerInfo
- Publication number
- JPS5566147A JPS5566147A JP13878778A JP13878778A JPS5566147A JP S5566147 A JPS5566147 A JP S5566147A JP 13878778 A JP13878778 A JP 13878778A JP 13878778 A JP13878778 A JP 13878778A JP S5566147 A JPS5566147 A JP S5566147A
- Authority
- JP
- Japan
- Prior art keywords
- output
- frequency
- oscillator
- counter
- necessary
- 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.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 abstract 2
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
- H03L7/185—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 a mixer in the 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
Landscapes
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To secure selection and output of the necessary and steady frequency by counting the output frequency of the variable frequency oscillator via the signal which gives the necessary gate time and then giving the count value as the division ratio of the programmable divider. CONSTITUTION:The output of voltage control oscillator 1 is divided by programmable divider 2, and the phase comparison is performed at phase comparator 4 between the division output and the reference oscillation output of reference oscillator 3. Then the output of comparator 4 is fed back to oscillator 1 via the LPF and DC amplifier 5 to give control to the frequency of oscillator 1. Frequency counter 7 which counts the output frequency of variable frequency oscillator 6 is installed to such circuit along with latch circuit 9 which latches the output of counter 7. Then the count value of counter 7 is controlled by the timing signal of timing circuit 8 which uses the reference oscillation output of oscillator 3 as the input, and the output of counter 7 is applied as the division ratio of divider 2. Thus the frequency of oscillator 6 is altered, and the frequency of oscillator 1 is selected to the necessary frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13878778A JPS5566147A (en) | 1978-11-13 | 1978-11-13 | Frequency synthesizer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13878778A JPS5566147A (en) | 1978-11-13 | 1978-11-13 | Frequency synthesizer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5566147A true JPS5566147A (en) | 1980-05-19 |
Family
ID=15230192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13878778A Pending JPS5566147A (en) | 1978-11-13 | 1978-11-13 | Frequency synthesizer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5566147A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5249711A (en) * | 1975-10-18 | 1977-04-21 | Trio Kenwood Corp | Synthesizer tuner |
-
1978
- 1978-11-13 JP JP13878778A patent/JPS5566147A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5249711A (en) * | 1975-10-18 | 1977-04-21 | Trio Kenwood Corp | Synthesizer tuner |
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