Speaker
Mr
Neil Murray
(Brunel University)
Description
The need for reducing CCD readout noise is highly relevant in X-Ray
astronomical detectors such as those proposed for the ESA XEUS
mission.
Digital sampling and filtering of a CCD's output using an ADC and DSP
or FPGA is presented to reduce the effects of readout noise and lower
system complexity. Correlated double sampling is used to resolve individual
pixel charge values, with the serial clock control signals determining
accurate timing for the sampling of the output signal. This avoids sampling
undesirable feed through voltages present on the analogue output
caused by reset and serial clocks, leaving the remaining noise components to be
digitally filtered out. Experimental results for the readout of a CCD
collecting X-Ray photons from an Fe55 source using the ADC-DSP method
are presented and evaluated against those obtained from a laboratory based
scientific camera system. The usefulness of the technique for
practical applications is discussed.
Primary author
Mr
Neil Murray
(Brunel University)
