JPH04112217A - Output circuit - Google Patents

Output circuit

Info

Publication number
JPH04112217A
JPH04112217A JP23211590A JP23211590A JPH04112217A JP H04112217 A JPH04112217 A JP H04112217A JP 23211590 A JP23211590 A JP 23211590A JP 23211590 A JP23211590 A JP 23211590A JP H04112217 A JPH04112217 A JP H04112217A
Authority
JP
Japan
Prior art keywords
output
voltage
circuit
gate
constant current
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.)
Pending
Application number
JP23211590A
Other languages
Japanese (ja)
Inventor
Hideo Fukatsu
深津 英雄
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 IC Microcomputer Systems Co Ltd
Original Assignee
NEC IC Microcomputer Systems Co Ltd
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 IC Microcomputer Systems Co Ltd filed Critical NEC IC Microcomputer Systems Co Ltd
Priority to JP23211590A priority Critical patent/JPH04112217A/en
Publication of JPH04112217A publication Critical patent/JPH04112217A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To economically and scrupulously switch the output current by changing the output voltage of a voltage switching circuit connected to the gate of a first output transistor TR to change the current driving capability of the first output TR. CONSTITUTION:Input signals of a decoder 7 are arbitrarily selected by input terminals I1 to In to change the output signal of the decoder 7; and when the output signal is in the VDD level, MOS field effect transistors (MOSFET) T21 to T2n connected to respective outputs are made conductive. Consequently, constant current i11 to i1n corresponding to the form ratio of selected MOSFETs T11 to T1n to a MOSFET T10 of a constant current i0 flowing to a constant current source 1 flow to a load circuit 2. A voltage corresponding to the constant current generated from the load circuit 2 is applied to the gate of a first output TR 41. Input terminals I11 to I1n are arbitrarily selected in this manner. Thus, the gate voltage of the first output TR 41 is changed to scrupulously switch the output current.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は出力回路に関し、特に出力電流をきめ細かく切
換える事が可能な出力回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an output circuit, and particularly to an output circuit capable of finely switching output current.

〔従来の技術〕[Conventional technology]

従来、この種の出力電流切換えは、複数用意された出力
トランジスタを1個、2個・・・n個と導通させていく
事により(第2図)、またそれぞれ抵抗値が異なる抵抗
を接続した出力トランジスタを順々に導通させていく事
により(第3図)実現していた。
Conventionally, this type of output current switching was achieved by connecting one, two, etc. of multiple output transistors (Figure 2), or by connecting resistors with different resistance values. This was achieved by sequentially turning on the output transistors (Figure 3).

第2図において、従来の出力回路の一例は、Pチャンネ
ル出力トランジスタT41.T42゜・・・、T4nが
並列接続され、これら各トランジスタのゲートに入力端
子11+I2+・・・I、を接続し、ANDゲート8を
介してNチャンネル出力トランジスタ51のゲートに接
続し、前記出力トランジスタT41.・・・、T4nの
ソースを共通接続して出力端子Oとなし、ドレインを共
通接続して電源VDDに接続し、出力トランジスタ51
のドレインを出力端子Oに、ソースを電源VSSに接続
している。
In FIG. 2, an example of a conventional output circuit includes P-channel output transistors T41. T42°..., T4n are connected in parallel, and the input terminals 11+I2+...I are connected to the gates of these transistors, and connected to the gate of the N-channel output transistor 51 via the AND gate 8, and the output transistors T41. ..., the sources of T4n are commonly connected to form the output terminal O, the drains are commonly connected to the power supply VDD, and the output transistor 51
Its drain is connected to the output terminal O, and its source is connected to the power supply VSS.

第3図において、従来の出力回路の他側は、第2図の回
路に、抵抗R,,R2,・・・2Roを付加した回路で
ある。
In FIG. 3, the other side of the conventional output circuit is a circuit in which resistors R, , R2, . . . , 2Ro are added to the circuit in FIG. 2.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

前述した従来の出力回路では、きめ細かい電流切換えを
実現すべく出力回路を構成した場合、出力トランジスタ
を数多く用意する必要があり、コスト的に不利となる。
In the conventional output circuit described above, when the output circuit is configured to realize fine current switching, it is necessary to prepare a large number of output transistors, which is disadvantageous in terms of cost.

又、出力トランジスタの数を制限すると、きめ細かい電
流切換えが実現されず、製品の満足すべく機能を果さな
いという欠点がある。
Furthermore, if the number of output transistors is limited, fine current switching cannot be realized, and the product cannot perform its functions satisfactorily.

本発明の目的は、前記欠点を解決すべく、きめ細かい出
力電流切換えを経済的に実現する出力回路を提供するこ
とにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide an output circuit that economically realizes fine output current switching in order to solve the above-mentioned drawbacks.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の出力回路の構成は、電圧切換え回路と、前記電
圧切換え回路の第1.第2の出力にそれぞれ接続される
第1.第2の出力トランジスタの直列体と、前記第1.
第2の出力トランジスタの共通接続点に接続される出力
端子と、前記電圧切換え回路の出力電圧を切り換える信
号を出力するデコーダと、前記デコーダに接続される入
力端子とを具備したことを特徴とする。
The configuration of the output circuit of the present invention includes a voltage switching circuit and a first output circuit of the voltage switching circuit. the first . a series body of second output transistors;
It is characterized by comprising an output terminal connected to a common connection point of the second output transistor, a decoder outputting a signal for switching the output voltage of the voltage switching circuit, and an input terminal connected to the decoder. .

〔実施例〕 次に本発明を図面を参照して説明する。第1図は本発明
の一実施例の出力回路を示す回路図である。第1図にお
いて本実施例は、定電流源1の一端を第一の電源■0.
に接続し、他端をMO8電界効果トランジスタ(MOS
FET)T10のゲートとトレインとに接続する。更に
、MOSFET T10のゲートとドレインとに、MO
SFET T 11〜T 1 nのそれぞれのゲートを
接続し、カレントミラー回路を構成する。MOSFET
  T 10〜T 1 nのソースは、第2の電源vs
sにそれぞれ接続する。
[Example] Next, the present invention will be explained with reference to the drawings. FIG. 1 is a circuit diagram showing an output circuit according to an embodiment of the present invention. In FIG. 1, in this embodiment, one end of the constant current source 1 is connected to the first power source ■0.
and connect the other end to an MO8 field effect transistor (MOS).
FET) Connected to the gate and train of T10. Furthermore, the gate and drain of MOSFET T10 are connected to MOSFET T10.
The gates of SFETs T 11 to T 1 n are connected to form a current mirror circuit. MOSFET
The sources of T 10 to T 1 n are connected to the second power supply vs.
Connect to s respectively.

MOSFET Tl 1のドレインは、MO8FETT
21(Dソー7、に接続し、同様1cMO8FETTl
 2.−、Tlnのドレインを、MO3FETT22.
・・・、T2nのそれぞれのソースに接続する。MOS
FET T21〜T2nは、スイッチとして作用し、そ
れぞれのドレインを接続し、負荷回路2の一端及び安定
化回路3に接続する。負荷回路2の他端は第1の電源V
DDに接続する。MO8FETT21〜2nのそれぞれ
のゲートは、デコーダ7の圧力にそれぞれ接続され、デ
コーダ7の入力信号は入力端チエ、〜工。から入力され
る。安定化回路3の出力は、第1の出力トランジスタ4
1のケートに接続し、第1の出力トランジスタ41のソ
ースは第一の電源VDDに、ドレインは出力端子○及び
第2の出力トランジスタ51のドレインにそれぞれ接続
される。第2の比カトランジスタ51のソースは第2の
電源V8.に、ゲートはNORゲート6の出力に接続さ
れる。NORゲート6の入力は、デコーダ7の出力にそ
れぞれ接続する。
The drain of MOSFET Tl 1 is MO8FET
21 (connected to D so 7, same 1c MO8FET Tl
2. -, the drain of Tln is connected to MO3FET T22.
. . . are connected to the respective sources of T2n. M.O.S.
The FETs T21 to T2n act as switches and connect their respective drains to one end of the load circuit 2 and the stabilizing circuit 3. The other end of the load circuit 2 is connected to the first power supply V
Connect to DD. The respective gates of MO8FET T21 to 2n are connected to the pressure of the decoder 7, respectively, and the input signal of the decoder 7 is input to the input terminals. Input from The output of the stabilizing circuit 3 is connected to the first output transistor 4
The source of the first output transistor 41 is connected to the first power supply VDD, and the drain is connected to the output terminal ○ and the drain of the second output transistor 51, respectively. The source of the second ratio transistor 51 is connected to the second power supply V8. , the gate is connected to the output of NOR gate 6. The inputs of the NOR gates 6 are respectively connected to the outputs of the decoders 7.

本実施例において、デコーダ7の入力信号を入力端子1
1+ I2+・・・工。で任意に選択する事により、デ
コーダ7の出力信号を変化し、出力信号がVDゎレベル
の場合それぞれの圧力に接続されているMO8FETT
21〜T2nを導通状態とし、定電流源1に流れる定電
流10に対し、選択されるMOSFET T 11〜T
 1 nのMOSFET TIOに対する形状比に相当
する定電流i+t〜11゜を負荷回路2に流す事ができ
る。負荷回路2より発生するそれぞれの定電流に応じた
電圧を、安定化回路3を介し第1の出力トランジスタ4
1のゲートに印加する。かくして、入力端子Ill〜I
lnを任意に選択する事により、第1の出力トランジス
タ41のゲート電圧を変化し、出力電流をきめ細がく切
り換える事が可能となる。また、MOSFET Tl 
1〜Tinのいずれも選択されない場合は第2のd力ト
ランジスタ51が導通状態となり、圧力端子0は第2の
電源電圧v6.が出力される。
In this embodiment, the input signal of the decoder 7 is input to the input terminal 1.
1+ I2+...Eng. By arbitrarily selecting , the output signal of decoder 7 is changed, and when the output signal is at VDゎ level, the MO8FET connected to each pressure is changed.
21 to T2n are in a conductive state, and MOSFETs T11 to T2n are selected for the constant current 10 flowing through the constant current source 1.
A constant current i+t~11° corresponding to the shape ratio of MOSFET TIO of 1n can be passed through the load circuit 2. A voltage corresponding to each constant current generated from the load circuit 2 is transmitted to the first output transistor 4 via the stabilization circuit 3.
1 gate. Thus, the input terminals Ill-I
By arbitrarily selecting ln, it is possible to change the gate voltage of the first output transistor 41 and finely switch the output current. Also, MOSFET Tl
1 to Tin is not selected, the second d-force transistor 51 becomes conductive, and the pressure terminal 0 is set to the second power supply voltage v6. is output.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明は、第1の出力トランジス
タのゲートに接続される電圧切換え回路の出力電圧を変
化させ、第1の出力トランジスタの電流駆動能力を変化
させる事により、経済的にかつきめ細かく出力電流を切
換えることができる効果がある。
As explained above, the present invention changes the output voltage of the voltage switching circuit connected to the gate of the first output transistor, and changes the current drive capability of the first output transistor, thereby achieving an economical and This has the effect of being able to finely switch the output current.

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

第1図は本発明の一実施例の出力回路を示す回路図、第
2図、第3図はいずれも従来の電流切換え可能な出力回
路の回路図である。 1・・・・・定電流源、2・・・・・・負荷回路、3・
・・・・安定化回路、T 4 ’1〜T4n・・・・・
出力トランジスタ(PチャンネルFET)、51〜5n
・・・・・出力トランジスタ(NチャンネルFET)、
6・  N。 Rゲート、7・・・・・・テコーグ、8・・・ANDゲ
ート、9・・・・・電圧切換え回路、TIO〜Tin・
・・・NチャンネルFET、T21〜T2n・・・・・
NチャンネルFET、R+〜R,・・・・・抵抗、■、
〜1.・・・・・・入力端子、○・・・・・・出力端子
。 代理人 弁理士  内 原   晋
FIG. 1 is a circuit diagram showing an output circuit according to an embodiment of the present invention, and FIGS. 2 and 3 are circuit diagrams of conventional current-switchable output circuits. 1...constant current source, 2...load circuit, 3...
...Stabilization circuit, T4'1~T4n...
Output transistor (P channel FET), 51~5n
...output transistor (N-channel FET),
6.N. R gate, 7...Tekog, 8...AND gate, 9...Voltage switching circuit, TIO~Tin・
...N channel FET, T21~T2n...
N-channel FET, R+~R,...Resistance, ■,
~1. ...Input terminal, ○...Output terminal. Agent Patent Attorney Susumu Uchihara

Claims (1)

【特許請求の範囲】[Claims] 電圧切換え回路と、前記電圧切換え回路の第1、第2の
出力にそれぞれ接続される第1、第2の出力トランジス
タの直列体と、前記第1、第2の出力トランジスタの共
通接続点に接続される出力端子と、前記電圧切換え回路
の出力電圧を切り換える信号を出力するデコーダと、前
記デコーダに接続される入力端子とを具備したことを特
徴とする出力回路。
a voltage switching circuit, a series body of first and second output transistors connected to the first and second outputs of the voltage switching circuit, respectively, and a common connection point of the first and second output transistors; 1. An output circuit comprising: an output terminal for switching the output voltage of the voltage switching circuit; a decoder for outputting a signal for switching the output voltage of the voltage switching circuit; and an input terminal connected to the decoder.
JP23211590A 1990-08-31 1990-08-31 Output circuit Pending JPH04112217A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23211590A JPH04112217A (en) 1990-08-31 1990-08-31 Output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23211590A JPH04112217A (en) 1990-08-31 1990-08-31 Output circuit

Publications (1)

Publication Number Publication Date
JPH04112217A true JPH04112217A (en) 1992-04-14

Family

ID=16934244

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23211590A Pending JPH04112217A (en) 1990-08-31 1990-08-31 Output circuit

Country Status (1)

Country Link
JP (1) JPH04112217A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184870A1 (en) * 2000-08-09 2002-03-06 Infineon Technologies AG Electronic driving circuit for memory word lines and memory device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5789307A (en) * 1980-11-26 1982-06-03 Hitachi Ltd Digital-analogue converting device
JPH0294920A (en) * 1988-09-30 1990-04-05 Seiko Epson Corp Digital/analog converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5789307A (en) * 1980-11-26 1982-06-03 Hitachi Ltd Digital-analogue converting device
JPH0294920A (en) * 1988-09-30 1990-04-05 Seiko Epson Corp Digital/analog converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184870A1 (en) * 2000-08-09 2002-03-06 Infineon Technologies AG Electronic driving circuit for memory word lines and memory device
US6501686B2 (en) 2000-08-09 2002-12-31 Infineon Technologies Ag Electronic driver circuit for word lines in a memory matrix, and memory apparatus

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