JPS62121841U

JPS62121841U -

Info

Publication number: JPS62121841U
Application number: JP19515886U
Authority: JP
Priority date: 1986-12-18
Filing date: 1986-12-18
Publication date: 1987-08-03

Description

[Brief explanation of the drawing]

第１図は公知のエミツタフオロワ及びダイオー
ドによるレベルシフト回路を含む電流切換型論理
基本ゲートを示す回路接続図、第２図は本考案の
基本原理を示す概略回路接続図、第３図は本考案
の一実施例を示す回路接続図である。１，２：電流切換用トランジスタ、３：エミツ
タフオロワ用トランジスタ、４：レベルシフト用
ダイオード、５，６：電流切換用トランジスタ、
７，８：高論理レベル設定用電流源、９：論理振
幅設定用電流源、Ｑ_１，Ｑ_４：電流切換用トラン
ジスタ、Ｑ_２，Ｑ_３：高論理レベル設定定電流源
用トランジスタ、Ｑ_５：論理振幅設定定電流源用
トランジスタ、ＩＮ：入力端子、Ｖ_ｏ：出力電圧
、Ｖ_ｃ：コレクタ電圧、ＶＲ：参照電圧、Ｖ_ｃｃ：電源電圧、Ｖ_ｃｃｖ：定電流源用参照電圧、Ｉ
_ｏ：論理振幅設定定電流、ＩＩＤ：高論理レベル
設定定電流。 Fig. 1 is a circuit connection diagram showing a current switching type logic basic gate including a known emitter follower and a level shift circuit using diodes, Fig. 2 is a schematic circuit connection diagram showing the basic principle of the present invention, and Fig. 3 is a circuit connection diagram of the present invention. FIG. 2 is a circuit connection diagram showing an example. 1, 2: Current switching transistor, 3: Emitter follower transistor, 4: Level shift diode, 5, 6: Current switching transistor,
7, 8: Current source for setting high logic level, 9: Current source for setting logic amplitude, _Q1 , _Q4 : Transistor for current switching, _Q2 , _Q3 : Transistor for constant current source for setting high logic level, _Q5 : Logic amplitude setting constant current source transistor, IN: Input terminal, V _o : Output voltage, V _c : Collector voltage, VR: Reference voltage, V _cc : Power supply voltage, _Vccv : Reference voltage for constant current source, I
_o : Logic amplitude setting constant current, IID: High logic level setting constant current.

Claims

[Scope of utility model registration request]

first and second transistors whose emitters are commonly connected; first and second load resistors connected between the respective collectors of the first and second transistors and a first power supply; a third transistor connected to the common emitter, having a base connected to a reference voltage source and an emitter connected to a second power source via a first resistor, at least one of the first and second transistors; In a current switching type logic circuit having one collector as an output terminal, the collectors are connected to the collectors of the first and second transistors, the bases are connected to the reference voltage source, the emitters are commonly connected, and the second resistor is connected to the collectors of the first and second transistors. 1. A current switching logic circuit comprising fourth and fifth transistors connected to a second power supply via a current switching type logic circuit.