JPH01142227U - - Google Patents

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Publication number
JPH01142227U
JPH01142227U JP3711488U JP3711488U JPH01142227U JP H01142227 U JPH01142227 U JP H01142227U JP 3711488 U JP3711488 U JP 3711488U JP 3711488 U JP3711488 U JP 3711488U JP H01142227 U JPH01142227 U JP H01142227U
Authority
JP
Japan
Prior art keywords
frequency
frequency divider
switch
reference signal
output
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
JP3711488U
Other languages
Japanese (ja)
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 filed Critical
Priority to JP3711488U priority Critical patent/JPH01142227U/ja
Publication of JPH01142227U publication Critical patent/JPH01142227U/ja
Pending legal-status Critical Current

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  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案による周波数シンセサイザの一
実施例を示すブロツク図、第２図は従来の周波数
シンセサイザの一例を示すブロツク図である。 １，２……基準信号発振器、３……スイツチ、
４……固定分周器、５……位相比較器、６……ロ
ーパスフイルタ、７……ＶＣＯ（電圧制御発振器
）、８……可変分周器、９……制御器、１０……
ＰＬＬ回路。 FIG. 1 is a block diagram showing an embodiment of a frequency synthesizer according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional frequency synthesizer. 1, 2...Reference signal oscillator, 3...Switch,
4... Fixed frequency divider, 5... Phase comparator, 6... Low pass filter, 7... VCO (voltage controlled oscillator), 8... Variable frequency divider, 9... Controller, 10...
PLL circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 複数の基準信号発振器と、これら発振器の発振
出力を選択するスイツチと、このスイツチで選択
された前記発振出力を分周する固定分周器と、こ
の固定分周器の分周出力を基準信号とし該基準信
号と電圧制御発振器の出力を可変分周器で分周し
た信号とを位相比較器で比較して、その出力をロ
ーパスフイルタを通して得られる直流電圧で前記
電圧制御発振器の周波数を制御するように構成さ
れた位相同期ループ回路と、前記可変分周器の分
周比を可変するとともに前記スイツチを制御する
ための制御器とを具備し、この制御器から送出さ
れる分周データに応じて前記可変分周器の分周比
を切換えると同時に、前記スイツチを選択制御し
て前記複数の基準信号発振器のうちの１つの発振
出力を前記固定分周器に入力するようにしたこと
を特徴とする周波数シンセサイザ。 A plurality of reference signal oscillators, a switch for selecting the oscillation output of these oscillators, a fixed frequency divider for dividing the frequency of the oscillation output selected by the switch, and a frequency divided output of the fixed frequency divider as a reference signal. A phase comparator compares the reference signal with a signal obtained by dividing the output of the voltage controlled oscillator using a variable frequency divider, and controls the frequency of the voltage controlled oscillator using a DC voltage obtained by passing the output through a low-pass filter. and a controller for varying the division ratio of the variable frequency divider and controlling the switch, according to the frequency division data sent from the controller. At the same time as switching the frequency division ratio of the variable frequency divider, the switch is selectively controlled to input the oscillation output of one of the plurality of reference signal oscillators to the fixed frequency divider. frequency synthesizer.
JP3711488U 1988-03-23 1988-03-23 Pending JPH01142227U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3711488U JPH01142227U (en) 1988-03-23 1988-03-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3711488U JPH01142227U (en) 1988-03-23 1988-03-23

Publications (1)

Publication Number Publication Date
JPH01142227U true JPH01142227U (en) 1989-09-29

Family

ID=31263693

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3711488U Pending JPH01142227U (en) 1988-03-23 1988-03-23

Country Status (1)

Country Link
JP (1) JPH01142227U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0486788A (en) * 1990-07-30 1992-03-19 Mitsubishi Electric Corp Microcomputer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0486788A (en) * 1990-07-30 1992-03-19 Mitsubishi Electric Corp Microcomputer

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