JPH06152388A - Frequency divider - Google Patents

Frequency divider

Info

Publication number
JPH06152388A
JPH06152388A JP9534292A JP9534292A JPH06152388A JP H06152388 A JPH06152388 A JP H06152388A JP 9534292 A JP9534292 A JP 9534292A JP 9534292 A JP9534292 A JP 9534292A JP H06152388 A JPH06152388 A JP H06152388A
Authority
JP
Japan
Prior art keywords
input
inverter
output
transfer gate
frequency divider
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
Application number
JP9534292A
Other languages
Japanese (ja)
Other versions
JP2701655B2 (en
Inventor
Sadahiko Sugiura
禎彦 杉浦
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP4095342A priority Critical patent/JP2701655B2/en
Publication of JPH06152388A publication Critical patent/JPH06152388A/en
Application granted granted Critical
Publication of JP2701655B2 publication Critical patent/JP2701655B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Abstract

PURPOSE:To provide a frequency divider capable of dividing frequency at a high frequency band. CONSTITUTION:The frequency divider has an inverter 55, a buffer circuit 54, transfer gates 52, 53, and a delay element 51. The control terminal of the gate 52 is defined as a true value signal input, the control terminal of the gate 53 is defined as a complementary signal input and the output of the inverter 55 is defined as a true value signal output. An input to the gate 52 fed back through the delay element 51 is synchronized with the directly impressed input at least by one time slot delay and the input is a synchronous pulse train or a sine wave.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は周波数分周器、特に周期
的なパルス列あるいは正弦波を入力とする周波数分周器
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency divider, and more particularly to a frequency divider having a periodic pulse train or a sine wave as an input.

【0002】[0002]

【従来の技術】周波数分周器は通信装置の周波数安定化
など、各種電子機器に広汎に使用されている。
2. Description of the Related Art Frequency dividers are widely used in various electronic devices such as frequency stabilization of communication devices.

【0003】図2は従来の1/2周波数分周器を示す回
路図で、ダイナミック型分周器である。
FIG. 2 is a circuit diagram showing a conventional 1/2 frequency divider, which is a dynamic type frequency divider.

【0004】入力およびそのコンプリメンタリをCおよ
びバーCに印加すると1/2に分周された出力がQに得
られる。本分周器は、例えばアイイーイーイー・ジャー
ナル・オブ・ソリッド・ステート・サーキッツ(IEE
E Journal ofSolid State C
ircuits)1983年6月号369〜376頁掲
載の論文「GaAs Digital Dynamic
IC’s forApplications up
to 10GHz」紹介されているが、GaAs・ME
SFETのICで最高分周周波数は約10GHzであ
る。
When the input and its complement are applied to C and C, an output divided in half is obtained in Q. This frequency divider is, for example, IEE Journal of Solid State Circuits (IEEE).
E Journal of Solid State C
published in June 1983, pages 369-376, "GaAs Digital Dynamic."
IC's for Applications up
to 10 GHz ”introduced, GaAs / ME
The maximum frequency of the SFET IC is about 10 GHz.

【0005】[0005]

【発明が解決しようとする課題】従来の周波数分周器に
は最高分周周波数があり、それ以上高い周波数では使用
できないという問題点がある。そこで最高分周周波数が
何に起因しているかを考察する。
However, the conventional frequency divider has a maximum frequency division frequency and cannot be used at a higher frequency. Therefore, we consider what is the cause of the highest frequency division.

【0006】図2のトランスファゲート21および2
3、バッファ回路22、インバータ24の伝播遅延時間
により最高分周周波数が決定する。通常、トランスファ
ゲート、バッファ回路はインバータに較べると伝播遅延
時間が無視できるほど小さいので、インバータの伝播遅
延時間にのみ依存すると考えてよい。インバータの伝播
遅延時間をtp d とすれば、最高分周周波数fm a x
m a x =1/2(2tp d )となる。fm a x はGa
As・ICでは約10GHz(tp d ≒50psec)
となる。
The transfer gates 21 and 2 of FIG.
3, the maximum division frequency is determined by the propagation delay time of the buffer circuit 22 and the inverter 24. Normally, the transfer gate and the buffer circuit are so small that they can be ignored as compared with the inverter, so it may be considered that they depend only on the propagation delay time of the inverter. If the propagation delay time of the inverter is t pd , the maximum frequency division frequency f max is f max = 1/2 (2t pd ). f max is Ga
Approximately 10 GHz for As-IC (t pd ≈ 50 psec)
Becomes

【0007】以上述べたように、従来の周波数分周器で
は論理回路の伝播遅延時間に起因する最高分周周波数が
あり、それ以上高い周波数では使用できない欠点があっ
た。
As described above, the conventional frequency divider has the maximum division frequency due to the propagation delay time of the logic circuit, and has a drawback that it cannot be used at higher frequencies.

【0008】本発明の目的は、このような従来の欠点を
除去せしめて、10GHz以上の高い周波数でも分周可
能な周波数分周器を提供することにある。
It is an object of the present invention to provide a frequency divider capable of dividing even at a high frequency of 10 GHz or higher by eliminating such a conventional defect.

【0009】[0009]

【課題を解決するための手段】本願発明の周波数分周器
は1個のインバータをM、1個のバッファ回路をN、2
個のトランスファゲートをO,Pとしたとき、トランス
ファゲートOの出力をバッファ回路Nの入力に接続し、
バッファ回路Nの出力をトランスファゲートPの入力に
接続し、トランスファゲートPの出力をインバータMの
入力に接続し、インバータMの出力をトランスファゲー
トOの入力に接続し、トランスファゲートOの制御端子
を真値信号入力とし、トランスファゲートPの制御端子
を相補(コンプリメンタリ)信号入力とし、インバータ
Mの出力を真値信号出力とした周波数分周器であって、
インバータMの出力に遅延素子を設け、この遅延素子を
介して帰還されたトランスファゲートへの入力が、直接
印加された入力に対して、少なくとも1タイムスロット
遅れて同期し、かつ入力は周期的パルス列あるいは正弦
波であることを特徴とする。
A frequency divider according to the present invention has one inverter M, one buffer circuit N, and two.
When the transfer gates are O and P, the output of the transfer gate O is connected to the input of the buffer circuit N,
The output of the buffer circuit N is connected to the input of the transfer gate P, the output of the transfer gate P is connected to the input of the inverter M, the output of the inverter M is connected to the input of the transfer gate O, and the control terminal of the transfer gate O is connected. A frequency divider in which a true value signal is input, a control terminal of a transfer gate P is used as a complementary (complementary) signal input, and an output of an inverter M is used as a true value signal output,
A delay element is provided at the output of the inverter M, the input to the transfer gate fed back through the delay element is synchronized with the directly applied input with a delay of at least one time slot, and the input is a periodic pulse train. Alternatively, it is a sine wave.

【0010】あるいは、前記の周波数分周器が半絶縁体
GaAs基板上に集積化され、能動素子としてMESF
ET、遅延素子としてマイクロトリップ線路を用いたこ
とを特徴とする。
Alternatively, the above-mentioned frequency divider is integrated on a semi-insulating GaAs substrate, and MESF is used as an active element.
A feature is that a micro trip line is used as an ET and a delay element.

【0011】[0011]

【実施例】次に、本発明の実施例について図面を参照し
て詳細に説明する。
Embodiments of the present invention will now be described in detail with reference to the drawings.

【0012】図1は本発明の実施例の回路図である。こ
の実施例の回路は、図2に示す従来例に対して遅延素子
51が付加されている。この遅延素子51を設けること
により、トランスファゲート53の端子56への帰還入
力を端子バーCへの1タイムスロット遅れた直接入力と
同期させることにより論理回路(この場合はインバー
タ)の伝播遅延時間の影響を回避することができる。
FIG. 1 is a circuit diagram of an embodiment of the present invention. In the circuit of this embodiment, a delay element 51 is added to the conventional example shown in FIG. By providing this delay element 51, the feedback input to the terminal 56 of the transfer gate 53 is synchronized with the direct input to the terminal bar C delayed by one time slot to reduce the propagation delay time of the logic circuit (in this case, the inverter). The influence can be avoided.

【0013】入力は完全に周期性のあるパルス列あるい
は正弦波を仮定している。従って、同期さえ保持されて
いれば、タイムスロットの差異は全く動作に影響を与え
ず、あたかも帰還入力の遅延時間が0なるごとくの動作
が行なえる。
The input assumes a perfectly periodic pulse train or sine wave. Therefore, as long as synchronization is maintained, the difference in time slots does not affect the operation at all, and the operation can be performed as if the delay time of the feedback input is zero.

【0014】このように、本発明では入力信号が完全に
周期性のあることを前提にしているため、ランダムパル
ス列の分周器は不可能である。また、ある周期の入力に
対して同期をとった場合、それより早い周期の入力に対
しても、遅い周期の入力に対しても同期がずれるため、
最高分周周波数とともに最低分周周波数が存在する。そ
して、その比帯域(最高分周周波数と最低分周周波数の
比)は遅延させるタイムスロット数が増加するほど狭く
なる。従って、遅延素子による遅延は必要最小限(すな
わち1タイムスロット以内で同期をとる遅延時間)にす
べきである。また、論理回路の伝播遅延時間もできるだ
け小さくして、遅延タイムスロット数を少なくすること
が好ましい。
As described above, the present invention is based on the premise that the input signal is completely periodic, and thus a frequency divider for a random pulse train is not possible. Also, if the input is synchronized with a certain period, the input will be out of sync with the input with the earlier period and the input with the later period.
There is a minimum division frequency as well as a maximum division frequency. The ratio band (ratio between the highest frequency division frequency and the lowest frequency division frequency) becomes narrower as the number of time slots to be delayed increases. Therefore, the delay due to the delay element should be minimized (that is, the delay time for synchronizing within one time slot). Further, it is preferable to reduce the propagation delay time of the logic circuit as much as possible to reduce the number of delay time slots.

【0015】以上の理由により、本発明が最も効力を発
揮する適用例はGaAs・MESFETを能動素子とし
て使用したICである。この場合、遅延素子の遅延時間
は数10psecで十分なため遅延素子として構造が簡
単でIC化に適しているマイクロストリップ線路が使え
る。GaAs基板上のマイクロストリップ線路の遅延時
間は線路長1mmで約10psecである。集中定数的
なL,Cを装荷した周期構造とすれば、さらに線路長を
短くすることができる。
For the above reasons, the application example in which the present invention is most effective is an IC using a GaAs MESFET as an active element. In this case, since the delay time of the delay element is several tens of psec, it is sufficient to use a microstrip line which has a simple structure as the delay element and is suitable for an IC. The delay time of the microstrip line on the GaAs substrate is about 10 psec when the line length is 1 mm. If the periodic structure is loaded with lumped constants L and C, the line length can be further shortened.

【0016】以上の説明から明らかなように本発明は入
力の周期性を巧みに利用しているためランダムパルス列
に対しては動作しない欠点がある。従って、パルスカウ
ンタとしては使用できない。しかしながら、5GHz以
上の高周波では、パルスカウンタとしての用途より周波
数分周器としての用途の方が需要が大きく、上記欠点は
実用上余り問題とならない。
As is apparent from the above description, the present invention has a drawback that it does not operate on a random pulse train because it makes good use of the periodicity of the input. Therefore, it cannot be used as a pulse counter. However, at a high frequency of 5 GHz or more, there is a greater demand for use as a frequency divider than for use as a pulse counter, and the above-mentioned drawbacks do not pose a problem in practice.

【0017】[0017]

【発明の効果】以上詳細に述べたように、本発明によれ
ば、超高周波が分周可能な周波数分周器を得ることがで
きる。
As described above in detail, according to the present invention, it is possible to obtain a frequency divider capable of dividing an ultrahigh frequency.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明を説明するための回路図である。FIG. 1 is a circuit diagram for explaining the present invention.

【図2】従来の1/2周波数分周器の回路図である。FIG. 2 is a circuit diagram of a conventional 1/2 frequency divider.

【符号の説明】[Explanation of symbols]

21 トランスファゲート 22 バッファ回路 23 トランスファゲート 24 インバータ 51 遅延素子 52,53 トランスファゲート 54 バッファ回路 55 インバータ 56 端子 21 transfer gate 22 buffer circuit 23 transfer gate 24 inverter 51 delay element 52, 53 transfer gate 54 buffer circuit 55 inverter 56 terminal

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 1個のインバータをM、1個のバッファ
回路をN、2個のトランスファゲートをO、Pとしたと
き、トランスファゲートOの出力をバッファ回路Nの入
力に接続し、バッファ回路Nの出力をトランスファゲー
トPの入力に接続し、トランスファゲートPの出力をイ
ンバータMの入力に接続し、インバータMの出力をトラ
ンスファゲートOの入力に接続し、トランスファゲート
Oの制御端子を真値信号入力とし、トランスファゲート
Pの制御端子を相補(コンプリメンタリ)信号入力と
し、インバータMの出力を真値信号出力とした周波数分
周器であって、インバータMの出力に遅延素子を設け、
この遅延素子を介して帰還されたトランスファゲートへ
の入力が、直接印加された入力に対して、少なくとも1
タイムスロット遅れて周期し、かつ入力は周期的パルス
列あるいは正弦波であることを特徴とする周波数分周
器。
1. When one inverter is M, one buffer circuit is N, and two transfer gates are O and P, the output of the transfer gate O is connected to the input of the buffer circuit N, The output of N is connected to the input of transfer gate P, the output of transfer gate P is connected to the input of inverter M, the output of inverter M is connected to the input of transfer gate O, and the control terminal of transfer gate O is a true value. A frequency divider having a signal input, a control terminal of the transfer gate P being a complementary (complementary) signal input, and an output of the inverter M being a true value signal output, wherein a delay element is provided at the output of the inverter M,
The input to the transfer gate fed back through this delay element is at least 1 for the directly applied input.
A frequency divider characterized in that it is periodic with a time slot delay and the input is a periodic pulse train or a sine wave.
【請求項2】 半絶縁性GaAs基板上に集積化され、
能動素子としてMESFET、遅延素子としてマイクロ
ストリップ線路を用いた請求項1記載の周波数分周器。
2. Integrated on a semi-insulating GaAs substrate,
The frequency divider according to claim 1, wherein a MESFET is used as the active element and a microstrip line is used as the delay element.
JP4095342A 1992-04-15 1992-04-15 Frequency divider Expired - Fee Related JP2701655B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4095342A JP2701655B2 (en) 1992-04-15 1992-04-15 Frequency divider

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4095342A JP2701655B2 (en) 1992-04-15 1992-04-15 Frequency divider

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP59207456A Division JPS6184922A (en) 1984-10-03 1984-10-03 Frequency divider

Publications (2)

Publication Number Publication Date
JPH06152388A true JPH06152388A (en) 1994-05-31
JP2701655B2 JP2701655B2 (en) 1998-01-21

Family

ID=14135023

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4095342A Expired - Fee Related JP2701655B2 (en) 1992-04-15 1992-04-15 Frequency divider

Country Status (1)

Country Link
JP (1) JP2701655B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7595668B2 (en) 2006-03-28 2009-09-29 Fujitsu Limited High speed dynamic frequency divider

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0754901A (en) * 1993-08-19 1995-02-28 Tokico Ltd Hydraulic shock absorber with adjustable damping force

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0754901A (en) * 1993-08-19 1995-02-28 Tokico Ltd Hydraulic shock absorber with adjustable damping force

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7595668B2 (en) 2006-03-28 2009-09-29 Fujitsu Limited High speed dynamic frequency divider

Also Published As

Publication number Publication date
JP2701655B2 (en) 1998-01-21

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