CURRENT CIRCUIT

• Main Authors: MOTO AKIHIRO, TANAKA KEIJI
• Format: Patent
• Language: English; Japanese
• Published: 09.03.2017
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; CONTROLLING; ELECTRICITY; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

PROBLEM TO BE SOLVED: To achieve miniaturization, and to suppress influences of a noise in an input current to an output current.SOLUTION: A current circuit that receives an input current Iin and outputs an output current proportional to the input current, comprises: a first current mirror circuit 10 that receives the input current and generates a first current depending on the input current; a first low-pass filter 25 that comprises a first transistor Q3 receiving a bias voltage at a control terminal, receiving the first current at one current terminal and outputting it from the other current terminal, and a first capacitor C0 whose one end is connected with the one current terminal; a second current mirror circuit 20 that receives the first current outputted from the other current terminal of the first transistor, and generates the output current depending on the first current; and a bias circuit 30 that generates the bias voltage corresponding to the input current.SELECTED DRAWING: Figure 5 【課題】小型化が可能であり、かつ入力電流のノイズの出力電流への影響を抑制すること。【解決手段】入力電流Ｉｉｎを受け、該入力電流に比例する出力電流を出力する電流回路であって、前記入力電流を受けて、前記入力電流に応じて第１の電流を生成する第１のカレントミラー回路１０と、バイアス電圧を制御端子に受け、前記第１の電流を一方の電流端子で受けて他方の電流端子から出力する第１のトランジスタＱ３と、該一方の電流端子に一端が接続された第１のキャパシタＣ０と、を備える第１のローパスフィルタ２５と、前記第１のトランジスタの他方の電流端子から出力される前記第１の電流を受けて、前記第１の電流に応じて前記出力電流を生成する第２のカレントミラー回路２０と、前記入力電流に対応する前記バイアス電圧を生成するバイアス回路３０と、を具備する電流回路。【選択図】図５