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1.问题的提出此低频前置放大器是为放大来自 InSb 光敏元件的弱信号,所以首先应考虑低噪声要求;另外考虑使它与光敏元件相连时,保证元件工作在最佳状态,即信噪比 S/N 最大。光伏型元件 InSb 在零偏时 S/N 最大,偏置稍大(约几毫伏),S/N 显著下降。我们希望在均匀背景产生的直流信号出现时,放大器对元件呈现很低的直流输入阻抗,保证 InSb 元件工作在“零偏”状态。
1. The issue put forward This low-frequency preamplifier is to amplify the weak signal from the InSb photosensitive element, it should first consider the low noise requirements; also consider making it connected with the photosensitive element to ensure that components work in the best condition, that is, Largest than S / N. Photovoltaic components InSb S / N in the bias when the largest bias slightly larger (about a few millivolts), S / N significantly decreased. We hope that when a DC signal is generated on a uniform background, the amplifier presents a very low DC input impedance to the part, ensuring that the InSb part operates in a “zero-bias” condition.