LOW NOISE CCD OUTPUT

摘要

Output signals are derived from two portions of a CCD imager. The first output signal is derived from a drain diffusion in the form of a signal current and applied to an amplifier with poor high frequency S/N due to needed high frequency peaking. The second output signal is derived from a floating diffusion (or floating gate) through an on-chip MOSFET amplifier which has a poor low frequency S/N due to 1/f noise. The first and second output signals are filtered through complementary LPF and HPF respectively and then combined together.