JPH07505734A - バスの電流源回路 - Google Patents
バスの電流源回路Info
- Publication number
- JPH07505734A JPH07505734A JP5518379A JP51837993A JPH07505734A JP H07505734 A JPH07505734 A JP H07505734A JP 5518379 A JP5518379 A JP 5518379A JP 51837993 A JP51837993 A JP 51837993A JP H07505734 A JPH07505734 A JP H07505734A
- Authority
- JP
- Japan
- Prior art keywords
- transistors
- current
- transistor
- coupled
- bus
- 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
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/028—Arrangements specific to the transmitter end
- H04L25/0282—Provision for current-mode coupling
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
- H03K19/018585—Coupling arrangements; Interface arrangements using field effect transistors only programmable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0298—Arrangement for terminating transmission lines
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Logic Circuits (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.(A)バスと接地点との問に結合して、バス電流を制御するトランジスタ手 段と; (B)トランジスタ手段に結合する制御回路と;(C)制御回路に結合して、ト ランジスタ手段を制御する制御装置であって、(I)(a)バスの所望の電流を 設定する設定手段と;(b)設定手段に結合するトランジスタ基準手段とを具備 し、第1の電圧を供給する可変レベル回路と; (2)基準電圧を供給する電圧基準手段と;(3)電圧基準手段及び可変レベル 回路に結合して、第1の電圧を基準電圧と比較する比較手段と; (4)比較手段からのトリガ信号に応答し、出力端子が制御回路に結合して、そ の出力に従った方式でトランジスタ手段をターンオンする論理手段とを具備する 制御装置とを具備するバスの電流源回路。 2.(A)トランジスタ手段は複数のトランジスタから構成されており;(B) 制御回路は複数のトランジスタのゲートに結合する論理回路から構成されている 請求項1記載の電流源回路。 3.トランジスタ手段はトランジスタから構成されている請求項1記載の電流源 回路。 4.論理手段は、比較手段からのトリガ信号を受信するまでカウントするカウン タから構成されており、複数のトランジスタの特定の組合わせをカウンタのカウ ントに従った方式でターンオンするために、カウンタの出力端子は論理回路に結 合している請求項2記載の電流源回路。 5.比較手段からのトリガ信号を受信すると、カウンタは最終カウントに設定さ れ、その最終カウントはラッチされ、且つ論理回路に結合するカウンタの出力は カゥンタのラッチされた最終カウントである請求項4記載の電流源回路。 6.設定手段は外部抵抗器である請求項2記載の電流源回路。 7.バスと接地点との間に結合する複数のトランジスタの各々の幅は互いの2進 倍数である請求項2記載の電流源回路。 8.トランジスタ基準手段は複数のトランジスタから構成されている請求項1記 載の電流源回路。 9.トランジスタ基準手段の複数のトランジスタの各々の幅は、バスと接地点と の間に結合する複数のトランジスタの各々の幅より相当に狭い請求項8記載の電 流源回路。 10.設定手段は複数のコンデンサから構成されている請求項1記載の電流源回 路。 11.トランジスタ基準手段は電流ミラー回路である請求項10記載の電流源回 路。 三2.複数のコンデンサの各々のキャパシタンスは互いの2進倍数である請求項 10記載の電流源回路。 13.複数のコンデンサはユーザー設定可能方式でトランジスタ基準手段に結合 している請求項10記載の電流源回路。 14.設定可能な所望の電流は電源の変動、プロセスの変動及び温度変化とはほ ぼ無関係である請求項1記載の電流源回路。 15.終端抵抗器を介して電源に結合しているバスに結合する電子装置の出力ド ライバにおいて、 (A)バスと接地点との間に結合して、バス電流を制御する複数のトランジスタ と; (B)複数のトランジスタのゲートに結合する制御回路と;(C)制御回路に結 合して、複数のトランジスタを制御する制御装置であって、(1)電源に結合し て、所望の電流を設定する抵抗器手段と;(2)抵抗器手段と接地点との問に結 合する複数のトランジスタから構成され、可変電圧を供給するために、複数のト ランジスタは選択的にターンオンされるようなトランジスタ基準手段と; (3)可変電圧を受信するように結合し、その可変電圧を基準電圧と比較する比 較手段と: (4)カウンタと; (5)(i)比較手段及び(ii)カウンタに結合して、可変電圧が基準電圧と ほぼ等しくなるようにトランジスタ基準手段の複数のトランジスタの特定の組合 わせがカウンタの出力によってターンオンされるまでカウンタにカウントさせる 制御論理とを具備し、バスと接地点との間に結合する複数のトランジスタの特定 の組合わせをターンオンするために、カウンタの出力は制御回路にも結合するよ うな制御装置とを具備する出力ドライバ。 16.制御回路は論理回路から構成されている請求項15記載の出力ドライバ1 7.バスと接地点との間に結合する複数のトランジスタは5つのNチャネル金属 −酸化膜半導体(NMOS)トランジスタから構成されており、5つのNMOS トランジスタの各々の幅は互いの2進倍数である請求項15記載の電子装置の出 力ドライバ。 18.トランジスタ基準手段の複数のトランジスタは5つのNMOSトランジス タから構成されており、トランジスタ基準手段の5つのNMOSトランジスタの 各々の幅は、バスと接地点との間に結合する複数のトランジスタの5つのNMO Sトランジスタの各々の幅より実質的に狭い請求項17記載の出力ドライバ。 19.抵抗器手段は、終端抵抗器の抵抗の5倍の抵抗を有する抵抗器から構成さ れている請求項15記載の出力ドライバ。 20.電子装置はマイクロプロセッサである請求項15記載の出力ドライバ。 21.電子装置はダイナミックランダムアクセスメモリ(DRAM)である請求 項15記載の出力ドライバ。 22.電源は約2.5ボルトであり且つ基準電圧は約2.2ボルトである請求項 15記載の出力ドライバ。 23.制御回路は複数の論理ゲートから構成されており、各論理ゲートは複数の トランジスタの中の対応する1つのトランジスタのゲートに結合している請求項 15記載の出力ドライバ。 24.カウンタに結合して、カウンタのカウントをラッチし且つそのカウントを 制御回路に供給するラッチをさらに具備する請求項15記載の出力ドライバ。 25.設定可能な所望の電流は電源の変動、プロセスの変動及び温度変化とはほ ぼ無関係である請求項15記載の出力ドライバ。 26.終端抵抗器を介して電源に結合しているバスに結合する電子装置の出力ド ライバにおいて、 (A)バスと接地点との間に結合して、バス電流を制御する複数のトランジスタ と; (B)複数のトランジスタのゲートに結合する制御回路と;(C)制御回路に結 合して、複数のトランジスタを制御する制御装置であって、(1)電源及び接地 点に結合し、所望の電流に比例する所定の値を有する電流を供給する出力端子を 有する電流ミラー手段と;(2)電流ミラー手段の出力端子に選択的に結合する 複数のコンデンサを有し、電流ミラー手段からの電流を受信し、その電流によっ て充電されたときに可変電圧を供給するコンデンサ手段と; (3)可変電圧を受信するように結合して、その可変電圧を基準電圧と比較する 比較手段と; (4)カウンタと; (5)(i)カウンタ、(ii)比較手段及び(iii)電流ミラー手段の出力 端子に結合して、コンデンサ手段を可変電圧まで充電させ且つコンデンサ手段が 充電したときにカウンタにカウントを開始させ、可変電圧が基準電圧とほぼ等し いことを指示するトリガ信号を比較手段から受信するまで、カウンタにカウント させる制御論理とを具備し、カウンタのカウントに従った方式で複数のトランジ スタの特定の組合わせをターンオンするために、カウンタの出力端子は制御回路 に結合しているような制御装置とを具備する出力ドライバ。 27.制御回路は論理回路から構成されている請求項26記載の出力ドライバ2 8.電子装置はDRAMである請求項26記載の出力ドライバ。 29.電子装置はマイクロプロセッサである請求項26記載の出力ドライバ。 30.複数のトランジスタは5つのNMOSトランジスタから構成されており、 5つのNMOSトランジスタの各々の幅は互いの2進倍数である請求項26記載 の出力ドライバ。 31.電流ミラー手段は第1のPチャネルトランジスタと、第2のPチャネルト ランジスタと、第1のNチャネルトランジスタとから構成されており、第1のN チャネルトランジスタの幅は複数のトランジスタの中の1つのトランジスタの幅 と等しく、第1のPチャネルトランジスタの幅は第2のPチャネルトランジスタ の幅の約20倍である請求項26記載の出力ドライバ。 32.複数のコンデンサは互いの2進倍数であるキヤパシタンスを有する請求項 26記載の出力ドライバ。 33.複数のコンデンサはユーザー設定可能方式で電流ミラー手段の出力端子に 結合している請求坂26記載の出力ドライバ。 34.基準電圧は約2.2ボルトであり且つ電源は約2.5ボルトに等しい請求 項26記載の出力ドライバ。 35.論理回路は複数の論理ゲートから構成されており、各論理ゲートは複数の トランジスタめ中の対応する1つのトランジスタのゲートに結合している請求項 27記載の出力ドライバ。 36.設定可能な所望の電流は電源の変動、プロセスの変動及び温度変化とはほ ぼ無関係である請求項26記載の出力ドライバ。 37.カウンタに結合して、カウンタのカウントをラッチし且つそのカウントを 制御回路に供給するラッチをさらに具備する請求項26記載の出力ドライバ。 38.電子装置はスレーブであり、マスタはバスに結合しており、且つマスタは 複数のコンデンサのうち選択的コンデンサを電流ミラー手段の出力端子に結合さ せる請求項26記載の出力ドライバ。 39.バスと、マスタと、出力ドライバを有するスレーブとを具備するバスシス テムにあって、スレーブのバスについて出力ドライバの電流を設定する方法にお いて、 (A)レジスタ設定を第1の値に設定する過程と;(B)マスタにレジスタ設定 をスレーブの出力ドライバへ送信させる過程と;(C)マスタから受信したレジ スタ設定に基づいて、スレーブに複数のコンデンサの中の選択的コンデンサを出 力ドライバの電流ミラー手段の出力端子に結合させる過程と; (D)電流手段の出力端子に結合している複数のコンデンサを、カウンタがカウ ントしている間に、可変電圧まで充電させる過程と;(E)可変電圧を基準電圧 と比較する過程と;(F)可変電圧が基準電圧とほぼ等しいとき、カウンタのカ ウントを停止させ且つカウンタの最新カウントをラッチする過程と;(G)パス に第1の電圧レベルを発生するために、カウンタの最終カウントに基づいて、バ スと接地点との間に結合する複数のトランジスタの特定の組合わせをターンオン する過程と; (H)マスタ内部でバスの第1の電圧を設定する過程と;(I)マスタ内部で第 1の電圧を基準電圧と比較する過程と;(J)レジスタ設定が基準電圧とほぼ等 しくない場合に、レジスタ設定を変更し且つ過程BからJを操り返す過程と;( K)レジスタ設定が基準電圧とほぼ等しい場合に、(1)レジスタ設定をレジス タ設定の現在値の2倍である値に設定する過程と; (2)マスタにレジスタ設定をスレーブの出力ドライバへ送信きせる過程と(3 )マスタから受信したレジスタ設定に基づいて、スレーブに複数のコンデンサの 中の選択的コンデンサを出力ドライバの電流ミラー手段の出力端子に結合させる 過程とから成る方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US872,919 | 1992-04-22 | ||
US07/872,919 US5254883A (en) | 1992-04-22 | 1992-04-22 | Electrical current source circuitry for a bus |
PCT/US1993/003005 WO1993021572A1 (en) | 1992-04-22 | 1993-03-30 | Electrical current source circuitry for a bus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07505734A true JPH07505734A (ja) | 1995-06-22 |
JP3509097B2 JP3509097B2 (ja) | 2004-03-22 |
Family
ID=25360599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP51837993A Expired - Lifetime JP3509097B2 (ja) | 1992-04-22 | 1993-03-30 | バスの電流源回路 |
Country Status (5)
Country | Link |
---|---|
US (1) | US5254883A (ja) |
JP (1) | JP3509097B2 (ja) |
KR (1) | KR0179666B1 (ja) |
AU (1) | AU3971693A (ja) |
WO (1) | WO1993021572A1 (ja) |
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- 1992-04-22 US US07/872,919 patent/US5254883A/en not_active Expired - Lifetime
-
1993
- 1993-03-30 WO PCT/US1993/003005 patent/WO1993021572A1/en active Application Filing
- 1993-03-30 KR KR1019940701618A patent/KR0179666B1/ko not_active IP Right Cessation
- 1993-03-30 JP JP51837993A patent/JP3509097B2/ja not_active Expired - Lifetime
- 1993-03-30 AU AU39716/93A patent/AU3971693A/en not_active Abandoned
Cited By (3)
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JPH09258865A (ja) * | 1996-02-29 | 1997-10-03 | Lexmark Internatl Inc | 特殊用途向け集積回路 |
JP2002368581A (ja) * | 2001-06-07 | 2002-12-20 | Nec Corp | 可変インピーダンス回路 |
JP4657497B2 (ja) * | 2001-06-07 | 2011-03-23 | ルネサスエレクトロニクス株式会社 | 可変インピーダンス回路 |
Also Published As
Publication number | Publication date |
---|---|
KR0179666B1 (ko) | 1999-04-01 |
JP3509097B2 (ja) | 2004-03-22 |
AU3971693A (en) | 1993-11-18 |
WO1993021572A1 (en) | 1993-10-28 |
US5254883A (en) | 1993-10-19 |
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