JPH10327067A - Frequency divider - Google Patents

Frequency divider

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Publication number
JPH10327067A
JPH10327067A JP13240397A JP13240397A JPH10327067A JP H10327067 A JPH10327067 A JP H10327067A JP 13240397 A JP13240397 A JP 13240397A JP 13240397 A JP13240397 A JP 13240397A JP H10327067 A JPH10327067 A JP H10327067A
Authority
JP
Japan
Prior art keywords
frequency
clock
signal
frequency divider
waveform
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
JP13240397A
Other languages
Japanese (ja)
Other versions
JP3707203B2 (en
Inventor
Tatsuya Kubo
達哉 久保
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP13240397A priority Critical patent/JP3707203B2/en
Publication of JPH10327067A publication Critical patent/JPH10327067A/en
Application granted granted Critical
Publication of JP3707203B2 publication Critical patent/JP3707203B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a frequency divider where a clock signal is frequency- divided at frequency division ratios including a half cycle of the clock signal. SOLUTION: The frequency divider is made up of a 1/(2n+1) frequency divider 1, a duty adjustment device 2, a (n+1/2) clock delay circuit 3 and a changeover device 4, a received clock CKo is frequency-divided at the 1/(2n+1) frequency divider 1 by 1/(2n+1) and then a duty factor of the signal frequency- divided by the duty adjustment device 2 to be 1:2n. The signal whose duty factor is adjusted is delayed at the (n+1/2) clock delay circuit 3 by (n+1/2) clocks and the delayed signal is given to the changeover device 4. On the other hand, even a signal before the delay outputted from the duty adjustment device 2 is given to the changeover device 4 and either of the two signals is selected by the clock CKo , and a frequency division output of CKo /(n+1/2) is obtained from the changeover device 4.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は分周器に関し、さら
に詳しくはクロックの半周期を含む分周比で分周するこ
とが可能な分周器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency divider, and more particularly, to a frequency divider capable of dividing a frequency by a division ratio including a half cycle of a clock.

【0002】[0002]

【従来の技術】従来の分周器は、例えば図6に示すよう
にカウンタ31により分周比設定部32で設定した整数
nでクロックCK0 をカウントし、CK0 /nに分周す
るものが一般的である。この場合、分周比nは整数に限
られていて、クロックの半サイクル分を含めた数で分周
を行うことはできなかった。従って、例えば1.5GH
zと1GHzと0.6GHzを得る場合にはその最小公
倍数の3GHzを源周波数とし、それを1/2、1/
3、1/5に分周する必要があった。即ち、高い周波数
の源発振器を必要としていた。
2. Description of the Related Art A conventional frequency divider counts a clock CK 0 by an integer n set by a frequency dividing ratio setting unit 32 by a counter 31 as shown in FIG. 6 and divides the clock into CK 0 / n. Is common. In this case, the frequency division ratio n is limited to an integer, and the frequency cannot be divided by a number including a half cycle of the clock. Thus, for example, 1.5 GH
When z, 1 GHz and 0.6 GHz are obtained, the least common multiple of 3 GHz is used as the source frequency, and it is set to 1/2, 1 /
It was necessary to divide by 3/5. That is, a high-frequency source oscillator was required.

【0003】[0003]

【発明が解決しようとする課題】従って本発明は、高い
周波数の源発振器を必要とすることなく、クロックの半
サイクルを含めた分周比で分周して、種々の周波数のク
ロックを生成しようとするものである。
Therefore, the present invention is to generate clocks of various frequencies by dividing by a dividing ratio including a half cycle of the clock without requiring a high-frequency source oscillator. It is assumed that.

【0004】[0004]

【課題を解決するための手段】本発明は上記課題に鑑み
なされたものであり、nを整数とし、クロックを1/
(2n+1)に分周する分周手段と、該分周手段により
分周された波形のデューティを2n:1とする波形整形
手段と、該波形整形手段により整形された波形を、(n
+1/2)クロックだけ遅延する遅延手段と、デューテ
ィを2n:1に整形した波形であって、遅延前の波形と
(n+1/2)クロック遅延後の波形とをクロックで交
互に切り換える切り換え手段とを具備し、クロックを1
/(n+1/2)に分周する分周器を構成して上記課題
を解決する。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is assumed that n is an integer and a clock is 1 /.
Frequency dividing means for dividing the frequency by (2n + 1), a waveform shaping means for setting the duty of the waveform divided by the frequency dividing means to 2n: 1, and a waveform shaped by the waveform shaping means by (n
Delay means for delaying by +1/2) clock, and switching means for alternately switching between a waveform before the delay and a waveform after the (n + 1/2) clock delay by a clock, which is a waveform shaped with a duty of 2n: 1. And the clock is 1
The above problem is solved by configuring a frequency divider for dividing the frequency by / (n + n).

【0005】本発明の構成によると、源発振器のクロッ
クを、クロックの半サイクルを含めた分周比で分周する
ことが可能となる。
According to the configuration of the present invention, it is possible to divide the frequency of the clock of the source oscillator by the frequency division ratio including a half cycle of the clock.

【0006】[0006]

【発明の実施の形態】本発明に係わる実施形態例につい
て図1および図5を参照して説明する。図1は本発明に
係わる分周器のブロック図であり、図2はこのブロック
図の要部のタイムチャートである。図3は本発明に係わ
る分周器の実施形態例であって、図4はその要部のタイ
ムチャートである。また、図5は本発明に係わる分周器
の他の実施形態例を示す図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of a frequency divider according to the present invention, and FIG. 2 is a time chart of a main part of the block diagram. FIG. 3 is an embodiment of a frequency divider according to the present invention, and FIG. 4 is a time chart of a main part thereof. FIG. 5 is a diagram showing another embodiment of the frequency divider according to the present invention.

【0007】まず、本発明の分周器は図1のブロック図
に示すように、(2n+1)分周器1と、デューティ調
整器2と、(n+1/2)クロック遅延回路3と、切換
器4とで構成されている。入力したクロックCK0
(2n+1)分周器1で1/(2n+1)に分周され、
つぎにデューティ調整器2で分周された信号のデューテ
ィを1:2nに調整する。このときH:L=1:2n、
またはH:L=2n:1のどちらに調整してもよい。
First, as shown in the block diagram of FIG. 1, the frequency divider of the present invention comprises a (2n + 1) frequency divider 1, a duty adjuster 2, a (n + 1/2) clock delay circuit 3, a switch 4. The input clock CK 0 is divided by the (2n + 1) frequency divider 1 into 1 / (2n + 1),
Next, the duty of the signal divided by the duty adjuster 2 is adjusted to 1: 2n. At this time, H: L = 1: 2n,
Alternatively, it may be adjusted to either H: L = 2n: 1.

【0008】デューティ調整された信号は(n+1/
2)クロック遅延回路3で(n+1/2)クロック分だ
け遅延され、切換器4に入力される。一方、デューティ
調整器2から出力された遅延前の信号も切換器4に入力
され、クロックCK0 によって2つの信号は切り換えら
れ、CK0 /(n+1/2)の分周出力を得る。
The duty-adjusted signal is (n + 1 /
2) The signal is delayed by (n + /) clocks in the clock delay circuit 3 and input to the switch 4. On the other hand, the signal before the delay output from the duty adjuster 2 is also input to the switch 4, and the two signals are switched by the clock CK 0 to obtain a frequency-divided output of CK 0 / (n + /).

【0009】図2は図1における2.5分周(n=2)
の場合のタイムチャートであって、同図(a)は入力ク
ロックCK0 であり、同図(b)は(2n+1)、即ち
5分周後のデューティ調整された波形である。この場
合、H:L=1:2n、即ち1:4となっている。同図
(c)はデューティ調整された後、n+1/2、即ち
2.5クロック遅延された後の波形である。更に同図
(d)は切換器4の出力波形であって、クロックCK0
によって同図(b)と同図(c)の波形が抜き取られて
形成されたものであって、クロックCK0 を1/2.5
に分周している。即ち、CK0 のLで同図(b)の波形
を選択し、一方、Hで同図(c)の波形を選択し、同図
(d)の分周出力を得ている。上述した構成により、ク
ロックの半サイクルを含めた分周比で分周することが可
能となっている。
FIG. 2 shows a frequency division of 2.5 (n = 2) in FIG.
In this case, FIG. 7A shows the input clock CK 0 , and FIG. 7B shows (2n + 1), that is, the waveform after the frequency division by 5 and the duty of which has been adjusted. In this case, H: L = 1: 2n, that is, 1: 4. FIG. 7C shows the waveform after the duty adjustment and n + 1/2, that is, after the 2.5 clock delay. FIG. 3D shows the output waveform of the switch 4 and the clock CK 0.
The waveforms shown in FIGS. 3B and 3C are extracted and formed, and the clock CK 0 is set to 1 / 2.5
Divided into That is, the waveform of FIG. 9B is selected by L of CK 0 , and the waveform of FIG. 9C is selected by H, and the divided output of FIG. 9D is obtained. With the above-described configuration, it is possible to divide the frequency by the frequency division ratio including a half cycle of the clock.

【0010】つぎに、本発明に係わる具体的な回路構成
と動作について説明する。尚、分周比は2.5(n=
2)とする。図3に示すように、D−FF(Dタイプフ
リップフロップ)11、D−FF12、D−FF13と
ANDゲート15が図1に示す(2n+1)分周器1に
相当し、目的とする2.5分周の2倍の5分周器を構成
している。クロックCK0 はD−FF11、D−FF1
2、D−FF13のCK端子に入力され、D−FF11
の端子Qから図4(b)に示す波形が、また、D−FF
12の端子Qから図4(b)に示す波形が出力される。
尚、図4(a)はクロックCK0 の波形である。
Next, a specific circuit configuration and operation according to the present invention will be described. The frequency division ratio is 2.5 (n =
2). As shown in FIG. 3, the D-FF (D-type flip-flop) 11, D-FF 12, D-FF 13, and AND gate 15 correspond to the (2n + 1) frequency divider 1 shown in FIG. A divide-by-5 frequency divider that is twice the divide-by-5 frequency is configured. Clock CK 0 is D-FF11, D-FF1
2. Input to the CK terminal of D-FF13,
The waveform shown in FIG. 4B from the terminal Q of FIG.
A waveform shown in FIG. 4B is output from twelve terminals Q.
Incidentally, FIG. 4 (a) is a waveform of the clock CK 0.

【0011】2入力のANDゲート16が図1に示すデ
ューティ調整器2に相当し、入力の一端にD−FF12
の出力が、他の一端にはD−FF11の出力が反転して
入力されていて、ANDゲート16の端子Yからは図4
(d)に示すようなH:L=1:4に成形された波形が
出力される。
A 2-input AND gate 16 corresponds to the duty adjuster 2 shown in FIG.
Is input to the other end of the output of the D-FF 11 by inverting the output of the D-FF 11.
A waveform shaped as H: L = 1: 4 as shown in (d) is output.

【0012】ANDゲート17とD−FF14が図1に
示す(n+1/2)クロック遅延回路3に相当し、AN
Dゲート17の端子Yからは図4(e)に示すように、
ANDゲート16の端子Yの出力より2クロック遅れた
信号が出力される。ANDゲート17の端子Yからの信
号をD−FF14の端子Dに入力し、クロックCK0
立ち下がりでサンプルすることにより、D−FF14の
端子Qからは、図4(f)に示すように、更に、半周期
遅れた信号が出力される。
The AND gate 17 and the D-FF 14 correspond to the (n + 1/2) clock delay circuit 3 shown in FIG.
From the terminal Y of the D gate 17, as shown in FIG.
A signal delayed by two clocks from the output of the terminal Y of the AND gate 16 is output. The signal from the terminal Y of the AND gate 17 is input to the terminal D of the D-FF 14, by sampling at the falling edge of the clock CK 0, from the terminal Q of the D-FF 14, as shown in FIG. 4 (f) Further, a signal delayed by a half cycle is output.

【0013】マルチプレクサ18は図1に示す切換器4
に相当し、上述したANDゲート16の端子Yからの信
号と、ANDゲート16の端子Yからの信号を2.5ク
ロック遅延させたD−FF14の端子Qからの信号とを
マルチプレクサ18に入力し、クロックCK0 で切り換
えることにより、即ち、クロックCK0 がHのときはD
−FF14の端子Qの信号を、一方、LのときはAND
ゲート16の端子Yからの信号を選択することにより、
図4(g)に示すようにクロックCK0 を1/2.5に
分周した信号が得られる。
The multiplexer 18 is connected to the switch 4 shown in FIG.
The signal from the terminal Y of the AND gate 16 and the signal from the terminal Q of the D-FF 14 obtained by delaying the signal from the terminal Y of the AND gate 16 by 2.5 clocks are input to the multiplexer 18. , By switching with clock CK 0 , that is, when clock CK 0 is H
The signal at the terminal Q of the FF 14 is AND
By selecting the signal from the terminal Y of the gate 16,
As shown in FIG. 4G, a signal obtained by dividing the clock CK 0 by 1 / 2.5 is obtained.

【0014】上述した構成による半サイクルを含む分周
回路は、特に高い周波数の分周に用いて効果が大きい。
例えば、パソコン等の画像信号をシリアルに伝送する回
路に用いる場合について、図5を参照して説明する。
The frequency dividing circuit including a half cycle according to the above configuration is particularly effective for frequency division at a high frequency.
For example, a case where the image signal is used in a circuit for serially transmitting an image signal, such as a personal computer, will be described with reference to FIG.

【0015】一般的にパラレルデータをシリアルデータ
に変換して伝送する場合、送り側(または受け側)の回
路にPLL(Phase Locked Loop )回路を持ち、VCO
(Voltage Controlled Oscillator )によって発振され
た一定の周波数で送信(または受信)する。
In general, when parallel data is converted into serial data and transmitted, a PLL (Phase Locked Loop) circuit is provided in a circuit on the transmitting side (or receiving side) and the VCO
(Voltage Controlled Oscillator) to transmit (or receive) at a constant frequency oscillated.

【0016】しかしながら、パソコン等の画像信号は解
像度により伝送周波数が異なる。一画面当たり、VGA
規格の解像度は640×480ドットであり、SVGA
規格の解像度は800×600ドットであり、XGA規
格の解像度は1024×768ドットであるので、1ド
ットを24ビット階調とし、1秒に80枚の画像を伝送
する場合、伝送に必要な周波数はVGA規格で約600
MHz、SVGA規格で約1GHz、XGA規格で約
1.5GHzとなり、それぞれの解像度に応じた伝送周
波数が必要となる。
However, the transmission frequency of an image signal from a personal computer or the like varies depending on the resolution. VGA per screen
The standard resolution is 640 x 480 dots, and SVGA
Since the resolution of the standard is 800 × 600 dots and the resolution of the XGA standard is 1024 × 768 dots, if one dot is a 24-bit gradation and 80 images are transmitted per second, the frequency required for transmission is required. Is about 600 in VGA standard
MHz, about 1 GHz in the SVGA standard, and about 1.5 GHz in the XGA standard, and transmission frequencies corresponding to the respective resolutions are required.

【0017】従来技術を用いると上記3種の周波数を生
成するためには、最小公倍数である約3GHzをVCO
を用いて発振させ、その発振周波数を2分周、3分周、
5分周してそれぞれの周波数を得なければならないが、
このような高い周波数を発振させるVCOを作成するこ
とは困難である。また、上記3種の周波数を含む600
MHz以上、1.5GHz以下の周波数帯域をもつVC
Oを作成することも困難であるため、単一のVCOでそ
れぞれの解像度に応じた伝送周波数を得ることがきなか
った。
According to the prior art, in order to generate the above three types of frequencies, the least common multiple of about 3 GHz must be
And oscillate by dividing the oscillation frequency by 2 and 3
You have to divide by 5 to get each frequency,
It is difficult to create a VCO that oscillates at such a high frequency. In addition, 600 including the above three frequencies
VC that has a frequency band between MHz and 1.5 GHz
Since it is also difficult to create O, it was not possible to obtain a transmission frequency corresponding to each resolution with a single VCO.

【0018】しかしながら本発明の分周回路によれば、
図5に示すようにVCO21の周波数をXGA規格の伝
送周波数約1.5GHzに合わせて発振させ、SVGA
規格に対してはこれを1.5分周器22により1.5分
周して約1GHzを得、また、VGA規格に対してはこ
れを2.5分周器23により2.5分周して約600M
Hzを得ることが可能となる。これら3種類のクロック
は切換器24に入力され、解像度選択信号の指示により
目的とするクロックを取り出すことによって単一のVC
Oで3種類の解像度に対する画像伝送が可能となる。
However, according to the frequency dividing circuit of the present invention,
As shown in FIG. 5, the frequency of the VCO 21 is oscillated in accordance with the transmission frequency of the XGA standard of about 1.5 GHz, and the SVGA
For the standard, this is divided by 1.5 with a 1.5 divider 22 to obtain about 1 GHz, and for the VGA standard, this is divided by 2.5 with a 2.5 divider 23. About 600M
Hz can be obtained. These three types of clocks are input to a switch 24, and a single VC is extracted by extracting a target clock in accordance with an instruction of a resolution selection signal.
O enables image transmission for three resolutions.

【0019】[0019]

【発明の効果】以上の説明から明らかなように、本発明
の分周器によると、クロックをクロックの半サイクルを
含めた分周比で分周することができるため、源発振器の
周波数を高くすることなく、種々の周波数のクロックを
得ることが可能となる。
As is apparent from the above description, according to the frequency divider of the present invention, the clock can be divided by the division ratio including the half cycle of the clock, so that the frequency of the source oscillator can be increased. It is possible to obtain clocks of various frequencies without performing.

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

【図1】 本発明に係わる分周器のブロック図である。FIG. 1 is a block diagram of a frequency divider according to the present invention.

【図2】 図1に示すブロック図の要部のタイムチャー
トである。
FIG. 2 is a time chart of a main part of the block diagram shown in FIG. 1;

【図3】 本発明に係わる分周器の実施形態例の回路構
成図である。
FIG. 3 is a circuit configuration diagram of an embodiment of a frequency divider according to the present invention.

【図4】 図3に示す回路構成図の要部のタイムチャー
トである。
FIG. 4 is a time chart of a main part of the circuit configuration diagram shown in FIG. 3;

【図5】 本発明に係わる分周器の他の実施形態例を示
す図である。
FIG. 5 is a diagram showing another embodiment of the frequency divider according to the present invention.

【図6】 従来の分周器について説明するための図であ
る。
FIG. 6 is a diagram for explaining a conventional frequency divider.

【符号の説明】[Explanation of symbols]

1…(2n+1)分周器、2…デューティ調整器、3…
(n+1/2)クロック遅延回路、4…切換器、11,
12,13,14…D−FF、15,16,17…AN
Dゲート、18…マルチプレクサ、21…VCO、22
…1.5分周器、23…2.5分周器、24…切換器、
31…カウンタ、32…分周比設定部
1 ... (2n + 1) divider, 2 ... Duty adjuster, 3 ...
(N + 1/2) clock delay circuit, 4 ... switch, 11,
12, 13, 14 ... D-FF, 15, 16, 17 ... AN
D gate, 18 multiplexer, 21 VCO, 22
... 1.5 frequency divider, 23 ... 2.5 frequency divider, 24 ... Switcher,
31: counter, 32: division ratio setting unit

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 nを整数とし、クロックを1/(2n+
1)に分周する分周手段と、 該分周手段により分周された波形のデューティを2n:
1とする波形整形手段と、 該波形整形手段により整形された波形を、(n+1/
2)クロックだけ遅延する遅延手段と、 デューティを2n:1に整形した波形であって、遅延前
の波形と(n+1/2)クロック遅延後の波形とを前記
クロックで交互に切り換える切り換え手段とを具備し、
前記クロックを1/(n+1/2)に分周することを特
徴とする分周器。
1. n is an integer and the clock is 1 / (2n +
Frequency dividing means for dividing into 1), and the duty of the waveform divided by the frequency dividing means is 2n:
1 and a waveform shaped by the waveform shaping means is (n + 1 /
2) delay means for delaying by a clock, and switching means for alternately switching between the waveform before the delay and the waveform after the (n + 1/2) clock delay, which is a waveform shaped with a duty ratio of 2n: 1, by the clock. Have,
A frequency divider, wherein the clock is frequency-divided into 1 / (n + 1/2).
JP13240397A 1997-05-22 1997-05-22 Divider Expired - Fee Related JP3707203B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13240397A JP3707203B2 (en) 1997-05-22 1997-05-22 Divider

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13240397A JP3707203B2 (en) 1997-05-22 1997-05-22 Divider

Publications (2)

Publication Number Publication Date
JPH10327067A true JPH10327067A (en) 1998-12-08
JP3707203B2 JP3707203B2 (en) 2005-10-19

Family

ID=15080587

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002176343A (en) * 2000-09-18 2002-06-21 Rohm Co Ltd Semiconductor integrated circuit device
JP2007200293A (en) * 2006-01-25 2007-08-09 Internatl Business Mach Corp <Ibm> Method and apparatus for dividing digital signal by x.5 in information handling system
JP2007538473A (en) * 2004-05-18 2007-12-27 ラムバス・インコーポレーテッド Wide range clock generator
JP2009055597A (en) * 2007-06-18 2009-03-12 Nagasaki Univ Timing generating circuit
US7734001B2 (en) 2004-02-09 2010-06-08 Nec Electronics Corporation Fractional frequency divider circuit and data transmission apparatus using the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002176343A (en) * 2000-09-18 2002-06-21 Rohm Co Ltd Semiconductor integrated circuit device
US7734001B2 (en) 2004-02-09 2010-06-08 Nec Electronics Corporation Fractional frequency divider circuit and data transmission apparatus using the same
JP2007538473A (en) * 2004-05-18 2007-12-27 ラムバス・インコーポレーテッド Wide range clock generator
JP2007200293A (en) * 2006-01-25 2007-08-09 Internatl Business Mach Corp <Ibm> Method and apparatus for dividing digital signal by x.5 in information handling system
JP2009055597A (en) * 2007-06-18 2009-03-12 Nagasaki Univ Timing generating circuit

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