1. The problem statement, all variables and given/known data VBE=0.7V The transistor in the circuit of Fig. P5.69 has a very high 0. Find the highest value of VB for which the transistor still operates in the active mode. 2. Relevant equations VC>VB IC=IE (since IB is approximated to zero due to high beta) EDIT: IE= [VE-0]/1k (VB - VE = VBE = 0.7V ---> VE = VB-0.7V) 3. The attempt at a solution This question is taken from sedra/smith 5th edition, there's some worked solution floating around the internet, however the solution provided is confusing. The condition given is that VC-VB=-0.4V I cant agree with the solution given because that equation would mean that the voltage at base is higher than that of the voltage of the collector since the potential difference is negative. What I was thinking is that VC - VB = 0. Am I correct, or did I missed anything?