JPS56126333A - Receiver of frequency synthesizer system - Google Patents

Receiver of frequency synthesizer system

Info

Publication number
JPS56126333A
JPS56126333A JP3113780A JP3113780A JPS56126333A JP S56126333 A JPS56126333 A JP S56126333A JP 3113780 A JP3113780 A JP 3113780A JP 3113780 A JP3113780 A JP 3113780A JP S56126333 A JPS56126333 A JP S56126333A
Authority
JP
Japan
Prior art keywords
signal
circuit
dividing
pass filter
low
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
JP3113780A
Other languages
Japanese (ja)
Inventor
Toru Akiyama
Tsutomu Ogishi
Takeshi Sakai
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP3113780A priority Critical patent/JPS56126333A/en
Publication of JPS56126333A publication Critical patent/JPS56126333A/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

Abstract

PURPOSE:To obtain a local oscillation signal over a wide range with a voltage controlling oscillator having a narrow range of oscillation frequency, by adding a dividing circuit having a variable ratio of division plus a low-pass filter to a PLL circuit utilizing a voltage controlling oscillator. CONSTITUTION:The signal fr' obtained by dividing the output of a stable reference oscillating circuit 10' is put into one side of a phase comparator 12'. A PLL circuit applies the signal fr' to the voltage controlling oscillator 13' having a narrow range of oscillation frequency via a low-pass filter 15', feeds the signal back to the comparator 12' via the programmable divider 14' having a variable dividing ratio of N' and then locking the signal after obtaining fv'=N'.fr'. Then the signal of a frequency f1'=fv'/M that is obtained through a division given by the dividing circuit 16 having a variable dividing ratio of M is extracted and then sent to the mixing circuit 2' via a low-pass filter 17 to eliminate the higher harmonic wave in the form of a local oscillation signal. In such way, a stable local oscillation signal that can receive a fine adjustment over a wide range can be obtained with a voltage control oscillating circuit having a narrow oscillation frequency.
JP3113780A 1980-03-11 1980-03-11 Receiver of frequency synthesizer system Pending JPS56126333A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3113780A JPS56126333A (en) 1980-03-11 1980-03-11 Receiver of frequency synthesizer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3113780A JPS56126333A (en) 1980-03-11 1980-03-11 Receiver of frequency synthesizer system

Publications (1)

Publication Number Publication Date
JPS56126333A true JPS56126333A (en) 1981-10-03

Family

ID=12323043

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3113780A Pending JPS56126333A (en) 1980-03-11 1980-03-11 Receiver of frequency synthesizer system

Country Status (1)

Country Link
JP (1) JPS56126333A (en)

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