JPS56104549A - Correction method for variation of intermediate frequency selecting element - Google Patents
Correction method for variation of intermediate frequency selecting elementInfo
- Publication number
- JPS56104549A JPS56104549A JP793280A JP793280A JPS56104549A JP S56104549 A JPS56104549 A JP S56104549A JP 793280 A JP793280 A JP 793280A JP 793280 A JP793280 A JP 793280A JP S56104549 A JPS56104549 A JP S56104549A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- prescaler
- programmable
- local oscillator
- intermediate frequency
- 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
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
- H03J5/0281—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 the digital values being held in an auxiliary non erasable memory
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To correct variance of the frequency characteristic of the IF filter, by changing the programmable frequency division ratio according to variance of the selecting (tuning) element of the intermediate frequency amplifying stage. CONSTITUTION:The output signal of local oscillator 3 has the frequency divided by programmable frequency divider 10 and prescaler 9 and is compared with reference frequency fL of quartz oscillator 12 in frequency and phase. The output of comparator 11 controls local oscillator 3 through LPF13. Since the PLL loop is formed by the local oscillator, the prescaler, the programmable frequency devider, and the phase comparator in this manner, expression of relation f0=N.P.fL (f0: the local frequency, N: the programmable frequency division ration, fL: the reference frequency, P: the frequency division ratio of the prescaler) is satisfied. If fL=2.5kHz and P=20 are satisfied f0 is changed by 50kHz by changing N by only 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP793280A JPS56104549A (en) | 1980-01-24 | 1980-01-24 | Correction method for variation of intermediate frequency selecting element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP793280A JPS56104549A (en) | 1980-01-24 | 1980-01-24 | Correction method for variation of intermediate frequency selecting element |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56104549A true JPS56104549A (en) | 1981-08-20 |
Family
ID=11679284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP793280A Pending JPS56104549A (en) | 1980-01-24 | 1980-01-24 | Correction method for variation of intermediate frequency selecting element |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56104549A (en) |
-
1980
- 1980-01-24 JP JP793280A patent/JPS56104549A/en active Pending
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