用于低场NMR的低噪声前置放大器研制

李科言, 程鑫, 陈俊飞, 曹丽, 黄臻, 刘朝阳

Development of Low-noise Preamplifier for Low-field NMR

LI Keyan, CHENG Xin, CHEN Junfei, CAO Li, HUANG Zhen, LIU Chaoyang

图2 晶体管噪声模型. (a) BJT小信号噪声模型；(b)等效输入噪声模型

Fig. 2 Transistor noise models. (a) BJT small-signal noise model; (b) Equivalent input noise model