Feature
   High gain:︱S21e︱2 TYP. Value is 10dB     @ VCE=10V，IC=20mA，f=1GHz
   Low noise: NF            TYP. Value is 1.7dB    @ VCE=10V，IC=7mA，f=1GHz
   fT (TYP.) :                   TYP. Value is 6.5GHz @ VCE=10V，IC=20mA，f=1GHz