Low noise ccd output

Details Low noise ccd output Low noise ccd output

H - Electricity

04

B

333/55

H04B 15/00 (2006.01) H01L 29/768 (2006.01) H04N 3/15 (2006.01) H04N 5/21 (2006.01) H04N 5/217 (2006.01)

Patent

CA 1191910

ABSTRACT LOW NOISE CCD OUTPUT The invention processes two signals having the same information content and having opposite noise-versus- frequency characteristics, to provide an output signal having said information content with reduced noise. In a particular use of the invention, the signals are derived from a CCD imager 14. In that case, one of the two signals may be a signal derived from a drain diffusion (28) in the form of a signal current and applied to an amplifier (40) which has a poor high frequency signal-to-noise ratio due to needed high frequency peaking, while the other signal may be derived from a floating diffusion (24) (or floating gate) through an on-chip MOSFET amplifier which has a poor low frequency signal-to-noise ratio due to 1/f noise. The two output signals are filtered through complementary low- pass and high-pass filters (52/62, 62/52) respectively, and then combined together.

423111

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