IC operational amplifier - IC operational amplifier

…There are two types of DC amplifiers: those that amplify the signal directly using a direct-coupled multi-stage amplifier, and those that first modulate the signal with a high-frequency carrier wave, amplify it with an AC amplifier, and then demodulate it using synchronous rectification with the same carrier wave to return it to a signal that includes a DC component. The former is typically an IC operational amplifier, which has a DC gain of a hundred and several tens of dB and an input offset voltage of less than a few mV. The biggest problem with direct-coupled amplifiers is drift, which is when the operating point moves with temperature changes. …

*Some of the terminology that refers to "IC operational amplifiers" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…直流増幅器には直結形の多段増幅器で信号をそのまま増幅するものと，信号をいったん高周波の搬送波で変調して交流増幅器で増幅し，同じ搬送波による同期整流を用いて復調して直流分を含む信号に戻す変調形直流増幅器の2種類がある。前者の典型はIC演算増幅器で直流利得百数十dB，入力オフセット電圧数mV以下の特性が得られている。直結形増幅器の場合は温度変化で動作点が移動するドリフトが最大の問題である。…

※「IC 演算増幅器」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報