INJECTION EFFICIENCY OF 8-MU-M TO 14-MU-M HYBRID FOCAL PLANE ARRAYS

The injection efficiency of an 8- to 14-mu-m hybrid IR/CCD FPA is calculated from a transcendental equation involving the detector, CCD input currents, and the detector impedance R(d) at the operating point. The latter has been varied either by changing the composition of x in the Hg1-x Cd(x), Te detector or by changing the tunneling current while x is kept constant, Calculations were carried out for both weak and strong inversion cases of the input MOSFET of the CCD. It is argued that for the 8- to 14-mu-m region, since the detector currents are high, operation of the input of the CCD in the strong inversion regime seems more reasonable.