JPS56126333A - Receiver of frequency synthesizer system - Google Patents
Receiver of frequency synthesizer systemInfo
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
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.
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) |
-
1980
- 1980-03-11 JP JP3113780A patent/JPS56126333A/en active Pending
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