Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt.........1q&link_type=abstract
Thesis (PhD). NEW JERSEY INSTITUTE OF TECHNOLOGY, Source DAI-B 60/02, p. 774, Aug 1999, 145 pages.
Physics
Optical Imaging
Scientific paper
This research was an investigation of a novel readout method for focal plane array (FPA) optical imaging, especially for very sensitive detectors with large dark current. The readout method is based on periodically blocking the optical input enabling the removal of the dark current integration from the output. The research demonstrated that it is feasible to modulate the optical input with the designed readout circuit and thus achieve longer signal integration time to enhance the signal-to- noise ratio. Study of a proposed circuit model showed that in theory the correlated readout method could increase the output voltage swing and reduce the noise level by attenuating low frequency noise, thereby effectively improving the FPA dynamic range. Circuits based on standard CMOS circuitry were designed, simulated by PSpice, fabricated using Orbit 2μm n-well technology, and tested with a PI-4000 system. In the circuit evaluation, the output noise due to the clock switching phenomena, the gate signal feedthrough and the charge relaxation, was considered to be the critical problem. The most promising design for minimizing this problem had a CMOS current steering circuit at the input of a high CMRR operational amplifier. Simulation and test results showed that a modified capacitive transimpedance amplifier (CTIA) could subtract dark current output and reduce the output signal due to any difference between the frequencies of the optical input modulation signal and the switch modulation signal. In conclusion, the correlated readout circuit was shown to be a promising approach for advancing FPA technology.
No associations
LandOfFree
A novel readout method for focal plane array imaging in the presence of large dark current does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A novel readout method for focal plane array imaging in the presence of large dark current, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A novel readout method for focal plane array imaging in the presence of large dark current will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1017145