In the experiment we also observed negative differential resistance characteristics of gesi hbts with heavily doped base at high collector - emitter voltage and high current . a new interpretation to this phenomenon was given . this 在实验中我们还观察到,在高vce和大电流下,重掺杂基区gesihbt出现负阻现象,我们对这一现象进行了新的解释,认为这是由热电负反馈导致的。