
644 Microwave Engineering
different potentials. In Figure 14.57a, the charge packet is localised in the
potential well underneath the
ϕ
1
electrode. As the electrode applied to elec-
trode
ϕ
2
increases (from 0 to 15 V) and at the same time, the voltage of
ϕ
1
decreases from 15 V to zero, the electron will move from the collapsing poten-
tial well underneath
ϕ
1
electrode to now expanding well underneath the
ϕ
2
electrode (Figure 14.57b). It may be noted that due to very close electrode
spacing (of about 2 μm (Figure 14.57c)), the depletion regions and potential
wells of the two electrodes will overlap during this transfer.
The electrons are injected ...