JPS56104549A - Correction method for variation of intermediate frequency selecting element - Google Patents

Correction method for variation of intermediate frequency selecting element

Info

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
Application number
JP793280A
Other languages
Japanese (ja)
Inventor
Masabumi Tanaka
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP793280A priority Critical patent/JPS56104549A/en
Publication of JPS56104549A publication Critical patent/JPS56104549A/en
Pending 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
    • 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.
JP793280A 1980-01-24 1980-01-24 Correction method for variation of intermediate frequency selecting element Pending JPS56104549A (en)

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)

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