RECEIVER CIRCUIT AND OPTICAL RECEIVER CIRCUIT

• Main Authors: KUMAGAI SEIJI, SUGIMOTO YOSHIYUKI, TANAKA KEIJI
• Format: Patent
• Language: English; Japanese
• Published: 20.06.2024
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

To reduce fluctuation in frequency characteristic at changing the gain.SOLUTION: A receiver circuit includes: a constant current circuit for generating a second differential current signal according to a first differential current signal; a current divider circuit for outputting a third differential current signal generated from the second differential current signal from a first output node and a second output node; and a differential TIA circuit for outputting a differential voltage signal from a first output terminal and a second output terminal according to the third differential current signal inputted from a third input node and a fourth input node. The differential TIA circuit includes: a first feedback resistance element connected between the third input node and the second output terminal; and a second feedback resistance element connected between the fourth input node and the first output terminal. Average voltages at the first output node, the second output node, the first output terminal, and the second output terminal is set to be mutually equal.SELECTED DRAWING: Figure 2 【課題】利得を変化させる際の周波数特性の変動を低減すること。【解決手段】第１差動電流信号に応じて第２差動電流信号を生成する定電流回路と、前記第２差動電流信号から生成した第３差動電流信号を第１出力ノードおよび第２出力ノードから出力する電流分流回路と、第３入力ノードおよび第４入力ノードから入力される前記第３差動電流信号に応じて差動電圧信号を第１出力端子および第２出力端子から出力する差動ＴＩＡ回路と、を備え、差動ＴＩＡ回路は、第３入力ノードと第２出力端子との間に接続される第１帰還抵抗素子と、第４入力ノードと第１出力端子との間に接続される第２帰還抵抗素子と、を備え、前記第１出力ノード、前記第２出力ノード、前記第１出力端子および前記第２出力端子のそれぞれの平均電圧は、互いに等しくなるように設定されている、受信回路。【選択図】図２