JPH03230604A - Oscillator - Google Patents
OscillatorInfo
- Publication number
- JPH03230604A JPH03230604A JP2025403A JP2540390A JPH03230604A JP H03230604 A JPH03230604 A JP H03230604A JP 2025403 A JP2025403 A JP 2025403A JP 2540390 A JP2540390 A JP 2540390A JP H03230604 A JPH03230604 A JP H03230604A
- Authority
- JP
- Japan
- Prior art keywords
- high frequency
- buffer amplifier
- base
- output
- collector
- 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.)
- Granted
Links
- 230000010355 oscillation Effects 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 230000000903 blocking effect Effects 0.000 claims 2
- 238000000926 separation method Methods 0.000 abstract description 6
- 238000002955 isolation Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Amplifiers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、移動通信装置等に用いられるＰＬＬ回路を利
用した局部発振器、周波数変調器のＩＣ化に好適な発振
器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an oscillator suitable for IC integration of a local oscillator and frequency modulator using a PLL circuit used in mobile communication devices and the like.
従来の技術
近年、移動通信装置の発振器は小形で低電圧で動作する
高安定なものが強く要求されており、ＰＬＬ回路を用い
ＩＣ化に適した回路構成について様々な提案がなされて
いる。BACKGROUND OF THE INVENTION In recent years, there has been a strong demand for oscillators for mobile communication devices to be compact, operate at low voltage, and be highly stable, and various proposals have been made regarding circuit configurations using PLL circuits suitable for IC implementation.
以下、第２図を用いて簡単に従来の発振器の構成を説明
する。Hereinafter, the configuration of a conventional oscillator will be briefly explained using FIG. 2.
発振部１からの出力は外部出力側緩衝増幅回路２および
プリスケーラ側緩衝増幅回路３に接続する。The output from the oscillator 1 is connected to an external output side buffer amplifier circuit 2 and a prescaler side buffer amplifier circuit 3.
外部出力側緩衝増幅回路２は、抵抗４．５、トランジス
タ６、ア、定電流源８より構成される両相側動形差動増
幅器であり、発振部１からの出力はトランジスタ６およ
びトランジスタ７のベースへ両相で接続する。両相側動
形差動増幅器２ａは両相側動形差動増幅器２と同一の回
路であり、直列に多段接続することで逆方向分離度の向
上な図つた回路である。これにより外部出力負荷変動を
軽減する機能を持つ。The external output side buffer amplifier circuit 2 is a double-phase side dynamic differential amplifier composed of a resistor 4.5, a transistor 6, and a constant current source 8. Connect to the base of both phases. The double-phase side dynamic differential amplifier 2a is the same circuit as the double-phase side dynamic differential amplifier 2, and is a circuit that can improve reverse isolation by connecting in series in multiple stages. This has the function of reducing external output load fluctuations.
またプリスケーラ側緩衝増幅回路３は、抵抗９．１０．
トランジスタ１１．１２、定電流源１３より構成されろ
両相駆動形差動増幅器であり、発振部１からの出力はト
ランジスタ１１およびトランジスタ１２のベースへ両相
で接続する。両相駆動形差動増幅器３ａは両相駆動形差
動増幅器３と同一の回路であり、直列に多段接続するこ
とで逆方向分離度の向上を図った回路である。これによ
り、プリスケーラからの分周出力成分が外部出力側へ漏
洩するのを軽減する機能を持つ。Further, the prescaler side buffer amplifier circuit 3 includes resistors 9, 10.
It is a dual-phase drive type differential amplifier composed of transistors 11 and 12 and a constant current source 13, and the output from the oscillation section 1 is connected to the bases of the transistors 11 and 12 in both phases. The double-phase drive type differential amplifier 3a is the same circuit as the double-phase drive type differential amplifier 3, and is a circuit that aims to improve the degree of reverse separation by connecting in series in multiple stages. This has the function of reducing leakage of the frequency-divided output component from the prescaler to the external output side.
発明が解決しようとする課題
しかし以上のような構成では、電源電圧が低く発振部と
差動増幅器を直接結合する場合には、外部出力側両相駆
動形差動増幅器トランンスタ６のコレクタ１４ａとベー
ス１５ａの間の電位差、トランジスタ７のコレクタ１４
とベース１６の間の電位差が小さく、トランジスタ６の
出力側コレクタ１４ａから入力側ベース１５ａへの逆方
向分離度、トランジスタ７の出力側コレクタ１４かも入
力側ベース１６への逆方向分離度が非常に悪く、両相駆
動形差動増幅器を２段以上接続しても逆方向分離度の改
善が得られず、外部出力負荷変動に弱いという課題を有
していた。Problems to be Solved by the Invention However, in the above configuration, when the power supply voltage is low and the oscillation section and the differential amplifier are directly coupled, the collector 14a and base of the external output side dual-phase drive type differential amplifier transformer 6 The potential difference between 15a and collector 14 of transistor 7
and the base 16 is small, and the reverse isolation from the output collector 14a of the transistor 6 to the input base 15a and the reverse isolation from the output collector 14 of the transistor 7 to the input base 16 are very large. Unfortunately, even if two or more stages of dual-phase drive type differential amplifiers are connected, the reverse isolation cannot be improved, and the device is susceptible to external output load fluctuations.
また、プリスケーラ側両相駆動形差動増幅器トランジス
タ１１のコレクタ１６とベース１７の間の電位差、 ）
ランジスタ１２のコレクタ１８とベース１９の間の電位
差が小さく、トランジスタ１１の出力側コレクタ１６か
も入力側ベース１７への逆方向分離度、トランジスタ１
２の出力側コレクタ１Ｂから入力側ベース１９への逆方
向分離度が非常に悪く、両相駆動形差動増幅器を２段以
上接続しても逆方向の分離度の改善が得られず、プリス
ケーラからの分周出力成分の外部漏洩が太きいという課
題を有していた。Also, the potential difference between the collector 16 and base 17 of the prescaler side double-phase drive type differential amplifier transistor 11,
Since the potential difference between the collector 18 and the base 19 of the transistor 12 is small, the output side collector 16 of the transistor 11 also has a reverse isolation degree to the input side base 17, and the transistor 1
2, the reverse isolation from the output side collector 1B to the input side base 19 is very poor, and even if two or more stages of dual-phase drive differential amplifiers are connected, the reverse isolation cannot be improved, and the prescaler The problem was that the external leakage of the frequency-divided output component from the oscilloscope was large.
さらに、発振部１かも緩衝増幅回路２．３への出力が両
相であるため発振部１の差動増幅回路が１段多くなり、
回路規模が大きくなるという課題を有していた。Furthermore, since the output to the buffer amplifier circuit 2.3 of the oscillation unit 1 is of both phases, the number of differential amplifier circuits of the oscillation unit 1 increases by one stage.
The problem was that the circuit scale became large.
本発明は上記課題を解決するもので、第１の目的は、外
部出力側緩衝増幅回路の逆方向分離度を改善するととも
に、１段以上接続した外部出力側緩衝増幅回路からの出
力方法を適切にすることで、外部出力負荷変動を低減す
るものである。The present invention solves the above-mentioned problems, and the first purpose is to improve the reverse isolation of an external output side buffer amplifier circuit, and to appropriately control the output method from the external output side buffer amplifier circuit connected in one or more stages. This reduces external output load fluctuations.
第２の目的は、プリスケーラ側緩衝増幅回路の逆方向分
離度を改善するとともに、プリスケーラ側緩衝増幅回路
を２段以上接続しその入出力接続を適切にすることで、
プリスケーラからの分周出力成分が外部出力側へ漏洩す
るのを低減するものである。The second purpose is to improve the reverse isolation of the prescaler side buffer amplifier circuit, and to connect two or more stages of prescaler side buffer amplifier circuits and make their input/output connections appropriate.
This is to reduce leakage of frequency-divided output components from the prescaler to the external output side.
課題を解決するための手段
上記目的を達成するため、本発明の技術的解決手段は、
第１に外部出力側緩衝増幅回路に単相駆動形差動増幅器
を用い１段以上接続するとともに、外部出力側緩衝増幅
回路の出力を高周波を阻止する容量をベースに接続した
トランジスタのコレクタ側より取り出したものである。Means for Solving the Problems In order to achieve the above object, the technical solution of the present invention is as follows:
First, one or more stages of single-phase drive type differential amplifiers are connected to the external output side buffer amplifier circuit, and the output of the external output side buffer amplifier circuit is connected to the collector side of the transistor connected to the base with a capacitor that blocks high frequencies. This is what I took out.
第２に、プリスケーラ側緩衝増幅回路に単相駆動形差動
増幅器を用い２段以上接続するとともに、プリスケーラ
側緩衝増幅回路終段以外の出力を高周波を阻止する容量
をベースに接続したトランジスタのコレクタ側より取り
出したものである。Second, two or more stages of single-phase drive type differential amplifiers are connected to the prescaler side buffer amplifier circuit, and the outputs of the prescaler side buffer amplifier circuit other than the final stage are connected to the collector of a transistor connected to the base with a capacitor that blocks high frequencies. It was taken out from the side.
作用
本発明は第１に、外部出力側緩衝増幅器を差動トランジ
スタペアの片側ベースを高周波接地する単相駆動形とす
ることで、ベースを高周波接地したトランジスタの出力
側コレクタから入力側ベースに戻ってきた高周波は接地
され、コレクタからベースへの逆方向分離度が改善され
るものである。First, the present invention provides a single-phase drive type external output buffer amplifier in which one base of a differential transistor pair is grounded at high frequency. The incoming high frequency waves are grounded, improving the reverse isolation from the collector to the base.
しかも、１段以上接続した緩衝増幅回路からの出力はベ
ースを高周波接地したトランジスタのコレクタより取り
出すことで、外部出力負荷変動は大幅に低減する。Furthermore, the output from the buffer amplifier circuits connected in one or more stages is taken out from the collector of a transistor whose base is grounded at high frequency, thereby significantly reducing external output load fluctuations.
第２に、プリスケーラ側緩衝増幅器を差動トランジスタ
ペアの片側ベースを高周波接地する単相駆動形とするこ
とで、ベースを高周波接地したトランジスタの出力側コ
レクタから入力側ベースに戻ってきた高周波は接地され
、コレクタからベースへの逆方向分離度が改善されるも
のである。しかも、２段以上接続した緩衝増幅回路の終
段以外の出力はベースを高周波接地したトランジスタの
コレクタより取り出すことで、プリスケーラからの分周
出力成分が外部出力側へ漏洩するのを大幅に低減する。Second, by making the prescaler buffer amplifier a single-phase drive type in which one side of the base of the differential transistor pair is high-frequency grounded, the high-frequency waves that return to the input base from the output-side collector of the transistor whose base is high-frequency grounded are grounded. This improves the reverse isolation from the collector to the base. Moreover, by extracting the outputs of buffer amplifier circuits connected in two or more stages other than the final stage from the collector of a transistor whose base is grounded to high frequency, leakage of the frequency-divided output component from the prescaler to the external output side is greatly reduced. .
実施例
以下、第１図を参照しながら本発明の一実施例について
説明する。EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG.
発振部１からの出力は外部出力側緩衝増幅回路２０およ
びプリスケーラ側緩衝増幅回路２１に接続する。The output from the oscillator 1 is connected to an external output side buffer amplifier circuit 20 and a prescaler side buffer amplifier circuit 21.
外部出力側緩衝増幅回路２ｏは、抵抗２２．２３．２７
、トランジスタ２４．２６、定電流源２６、容量２８よ
り構成される単相側動形差動増幅器であり、発振部１か
らの出力をトランジスタ２４のベースへ単相で接続する
。The external output side buffer amplifier circuit 2o includes resistors 22, 23, and 27.
, transistors 24 and 26, a constant current source 26, and a capacitor 28. The output from the oscillation section 1 is connected to the base of the transistor 24 in a single phase.
プリスケーラ側緩衝増幅回路２１は、抵抗２９．３０．
３４、トランジスタ３１．３２、定電流源３３、容量３
５より構成される単相側動形差動増幅器であり、発振部
１かもの出力をトランジスタ３１のベースへ単相で接続
する。The prescaler side buffer amplifier circuit 21 includes resistors 29, 30 .
34, transistor 31.32, constant current source 33, capacitor 3
The output of the oscillating section 1 is connected to the base of the transistor 31 in a single phase.
外部出力側単相駆動形差動増幅器は差動トランジスタペ
アの片側２５のベース３７を容量２８で高周波接地する
。出力側コレクタ３６から入力側ベース３７に高周波が
戻った時、ベース３７は容量２８で高周波接地されてい
るため入力側に高周波は現れず、コレクタ３６からベー
ス３７への逆方向分離度は大幅に改善される。しかも、
１段以上接続した緩衝増幅回路の出力をベースが高周波
接地された側のトランジスタのコレクタより取り出すこ
とで、外部出力負荷変動は大幅に低減することができる
。In the external output side single-phase drive type differential amplifier, the base 37 of one side 25 of the differential transistor pair is grounded at high frequency using the capacitor 28. When the high frequency returns from the output side collector 36 to the input side base 37, since the base 37 is high frequency grounded through the capacitor 28, the high frequency does not appear on the input side, and the degree of reverse separation from the collector 36 to the base 37 is greatly increased. Improved. Moreover,
External output load fluctuations can be significantly reduced by taking out the output of the buffer amplifier circuits connected in one or more stages from the collector of the transistor whose base is grounded at high frequency.
単相側動形差動増幅器４０は単相側動形差動増幅器２０
と同一の回路であり、直列に接続され、多段接続により
逆方向分離度の向上を図った回路である。The single-phase side differential amplifier 40 is the single-phase side differential amplifier 20
This is the same circuit as , which is connected in series to improve reverse isolation through multi-stage connections.
上記作用から明らかなように、外部出力の負荷が変動し
た場合でも発振回路への影響は大幅に軽減され、安定し
た発振が得られる。As is clear from the above operation, even if the external output load fluctuates, the influence on the oscillation circuit is significantly reduced, and stable oscillation can be obtained.
プリスケーラ側単相駆動形差動増幅器は差動トランジス
タベアの片側３２のベース３９を容量３６で高周波接地
する。出力側コレクタ３８から入力側ベース３９に高周
波が戻った時、ベース３９は容量３６で高周波接地され
ているため入力側に高周波は現れず、コレクタ３８から
ベース３９への逆方向分離度は大幅に改善される。そし
て、２段以上接続した緩衝増幅回路の終段以外の出力を
ベースが高周波接地されたトランジスタのコレクタより
取り出すことで、プリスケーラからの分周出力成分が外
部出力側へ漏洩するのを大幅に低減することができる。In the single-phase drive type differential amplifier on the prescaler side, the base 39 of one side 32 of the differential transistor bare is grounded at high frequency through a capacitor 36. When the high frequency returns from the output side collector 38 to the input side base 39, since the base 39 is high frequency grounded through the capacitor 36, the high frequency does not appear on the input side, and the degree of reverse separation from the collector 38 to the base 39 is greatly increased. Improved. By extracting the outputs of buffer amplifier circuits connected in two or more stages other than the final stage from the collector of a transistor whose base is grounded at high frequency, leakage of the frequency-divided output component from the prescaler to the external output side is significantly reduced. can do.
単相側動形差動増幅器４１は単相側動形差動増幅器２１
と同一の回路であり、直列に接続され、多段接続により
逆方向分離度の向上を図った回路である。The single-phase side differential amplifier 41 is the single-phase side differential amplifier 21
This is the same circuit as , which is connected in series to improve reverse isolation through multi-stage connections.
上記作用から明らかなように、プリスケーラから分周出
力成分が戻ってきた場合でも外部出力にその分周出力成
分は現れず、不要輻射のない発振出力が得られる。As is clear from the above operation, even if the frequency-divided output component is returned from the prescaler, the frequency-divided output component does not appear in the external output, and an oscillation output without unnecessary radiation can be obtained.
さらに、発振部１かも緩衝増幅回路２０．２１への出力
が単相であるため発振部１の差動増幅回路を１段削除で
き、回路規模が小さくなる。Furthermore, since the output to the buffer amplifier circuits 20 and 21 of the oscillation section 1 is single-phase, one stage of the differential amplifier circuit of the oscillation section 1 can be removed, and the circuit scale can be reduced.
発明の効果
以上のように本発明は、発振回路に接続する緩衝増幅回
路に単相側動形差動増幅器を用いるとともに、１段ある
いは２段以上多段に接続した緩衝増幅回路の出力方法を
適切にすることで逆方向分離度を大幅に改善し、外部負
荷変動に強く、不要輻射のないＩＣ化に好適な発振器を
容易に可能とする。Effects of the Invention As described above, the present invention uses a single-phase side dynamic differential amplifier for the buffer amplifier circuit connected to the oscillation circuit, and also appropriately adjusts the output method of the buffer amplifier circuits connected in one or more stages. By doing so, the degree of reverse separation is greatly improved, and an oscillator that is resistant to external load fluctuations and free from unnecessary radiation and is suitable for IC implementation can be easily created.
第１図は本発明の一実施例における発振器の回路図、第
２図は従来の発振器における回路図である。
１・・・発振回路、４．６．９．１０．２２．２３．２
７．２９．３０．３４・・・抵抗、６．７．１１．１２
．２４．２５．３１，３２・・・トランジスタ、８．１
３．２６．３３°°°定電流源、２８．３５・・・容量
、２．２ａ、３．３ａ・・・両相駆動形差動増幅器、２
ｏ、２１．４０．４１・・・単相側動形差動増幅器。
第
１
図
第
図
計
３αFIG. 1 is a circuit diagram of an oscillator according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional oscillator. 1...Oscillation circuit, 4.6.9.10.22.23.2
7.29.30.34...Resistance, 6.7.11.12
．． 24.25.31,32...Transistor, 8.1
3.26.33°°° constant current source, 28.35...capacitance, 2.2a, 3.3a...dual phase drive type differential amplifier, 2
o, 21.40.41...Single-phase side dynamic differential amplifier. Figure 1 Figure total 3α
Claims (1)
ラ側緩衝増幅回路とを具備し、前記外部出力側緩衝増幅
回路は１段以上の単相駆動形差動増幅器で、前記プリス
ケーラ側緩衝増幅回路は２段以上の単相駆動形差動増幅
器から構成されたことを特徴とする発振器。（２）外部
出力側緩衝増幅回路の出力を、高周波を阻止する容量を
ベースに接続したトランジスタのコレクタ側より取り出
したことを特徴とする請求項１記載の発振器。 （３）プリスケーラ側緩衝増幅回路終段以外の出力を、
高周波を阻止する容量をベースに接続したトランジスタ
のコレクタ側より取り出したことを特徴とする請求項１
記載の発振器。[Scope of Claims] (1) An oscillation circuit, an external output side buffer amplifier circuit, and a prescaler side buffer amplifier circuit are provided, and the external output side buffer amplifier circuit is a single-phase drive type differential amplifier with one or more stages, An oscillator characterized in that the prescaler side buffer amplifier circuit is composed of two or more stages of single-phase drive type differential amplifiers. (2) The oscillator according to claim 1, wherein the output of the external output side buffer amplifier circuit is taken out from the collector side of a transistor whose base is connected to a capacitor for blocking high frequencies. (3) Outputs other than the final stage of the prescaler side buffer amplifier circuit,
Claim 1 characterized in that the capacitor for blocking high frequencies is taken out from the collector side of the transistor connected to the base.
The oscillator mentioned.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2025403A JP2621536B2 (en) | 1990-02-05 | 1990-02-05 | Oscillator |
| US07/534,866 US5055804A (en) | 1989-06-21 | 1990-06-08 | Oscillator |
| DE69026649T DE69026649T2 (en) | 1989-06-21 | 1990-06-19 | Circuit for supplying an external circuit and a prescaler with an oscillator signal |
| EP90111596A EP0404080B1 (en) | 1989-06-21 | 1990-06-19 | An arrangement for supplying an oscillator signal to an external circuit and a prescaler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2025403A JP2621536B2 (en) | 1990-02-05 | 1990-02-05 | Oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03230604A true JPH03230604A (en) | 1991-10-14 |
| JP2621536B2 JP2621536B2 (en) | 1997-06-18 |
Family
ID=12164943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2025403A Expired - Lifetime JP2621536B2 (en) | 1989-06-21 | 1990-02-05 | Oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2621536B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000286648A (en) * | 1999-03-31 | 2000-10-13 | Hitachi Ltd | Semiconductor integrated circuit device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01122613U (en) * | 1988-02-15 | 1989-08-21 |
-
1990
- 1990-02-05 JP JP2025403A patent/JP2621536B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01122613U (en) * | 1988-02-15 | 1989-08-21 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000286648A (en) * | 1999-03-31 | 2000-10-13 | Hitachi Ltd | Semiconductor integrated circuit device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2621536B2 (en) | 1997-06-18 |
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