JPS5994446U

JPS5994446U - frequency synthesizer

Info

Publication number: JPS5994446U
Application number: JP18917182U
Authority: JP
Inventors: 直人本田
Original assignee: 株式会社東芝
Priority date: 1982-12-16
Filing date: 1982-12-16
Publication date: 1984-06-27

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は周波数シンセサイザの基本構成図、第２図は位
相比較器入出力とチャージポンプ出力との関係を示す図
、第３図はラグリードフィルタの回路構成図、第４図は
本考案の一実施例の回路構成図である。１・・・・・・基準発振器、２・・・・・・位相比較器
、３・・・・・・チャージポンプ、４・・・・・・ルー
プフィルタ、５・・・・・・ＶＣＯ（電圧制御発振器）
、６・・・・・・可変分周器、７゜８・・・・・・抵抗
、９・・・・・・コンデンサ、１０・・・・・・電圧制
御回路、１１・・・・・・安定化電源回路、１２・・・
・・・チャージポンプ、１３・・・・・・ループフィル
タ、１４〜１７・・・・・・抵Ｌ　１８，１９−−−−
−−）ランジスタ、１３１・・・・・・コンデンサ。Figure 1 is a basic configuration diagram of a frequency synthesizer, Figure 2 is a diagram showing the relationship between phase comparator input/output and charge pump output, Figure 3 is a circuit diagram of a lag lead filter, and Figure 4 is a diagram of the present invention. FIG. 2 is a circuit configuration diagram of an embodiment. 1... Reference oscillator, 2... Phase comparator, 3... Charge pump, 4... Loop filter, 5... VCO ( voltage controlled oscillator)
, 6... Variable frequency divider, 7° 8... Resistor, 9... Capacitor, 10... Voltage control circuit, 11...・Stabilized power supply circuit, 12...
...Charge pump, 13...Loop filter, 14-17...Resistor L 18, 19----
--) transistor, 131... capacitor.

Claims

[Scope of utility model registration request]

A voltage controlled oscillator, a frequency divider that divides a part of the output of the voltage controlled oscillator, a phase comparator that compares the phase of this frequency divider output with the reference oscillator output, and a In a frequency synthesizer that obtains signals of a large number of frequencies and includes a charge pump that controls charging and discharging of a capacitor of a subsequent loop filter, means for controlling the level of a voltage applied to the charge pump based on the voltage-controlled oscillation frequency. A frequency synthesizer characterized by being provided with.