The resistance [r.sub.s] represents the constant series contact resistance and quasineutral region resistance of the LED, [r.sub.d] represents the small signal resistance of the LED at certain DC current, and [C.sub.d] represents the
diffusion capacitance at a certain DC current.
4c, containing a diffusive combination consisting of a
diffusion capacitance ([C.sub.diff]) and diffusion resistance ([R.sub.diff]) was introduced to fit the spectra.
The
diffusion capacitance is dominant during the conductive state of the diode, the junction capacitance in non-conductive state [1].
(6) The capacitor at the emitter terminal, [C.sub.E], forms a positive feedback loop together with the base-emitter
diffusion capacitance of Q1.
Electrons that are clocked out of the CCD to the output node cause a node voltage change according to [delta]V = qN / [C.sub.fd] where q = the electron charge N = the number of electrons transferred [C.sub.fd] = the output node capacitance In general, minimizing [C.sub.fd] increases the output sensitivity and reduces he noise.[27] Normally, the capacitance C includes the floating
diffusion capacitance and the output amplifier MESFET gate capacitance.