DCDS for roundtable Paul Jorden 10 Oct 2013 Scientific Detector Workshop, Florence e2vMatthew Bastable and others RAL Matthew Clapp and others.

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Presentation transcript:

DCDS for roundtable Paul Jorden 10 Oct 2013 Scientific Detector Workshop, Florence e2vMatthew Bastable and others RAL Matthew Clapp and others

Slide 2 The motivation Integrated Focal Plane Electronics Readout electronics for large focal plane arrays Prototyping a test systems using DCDS. JPAS focal plane 224 signal channels Digital Correlated Double Sampling (DCDS) –Moves a significant proportion of the signal processing into the digital domain –Minimise complexity and size of analogue electronics

Slide 3 DCDS Processing Limited to sampling the settled output voltage Sample frequency/pixel frequency > bit accuracy System bandwidth at ADC nyquist frequency 10% clamp period © 2012 RAL Space

Slide 4 Video Chain © 2012 RAL Space Digital Correlated Double Sampling (DCDS) DC restore Anti-alias filter Single ended to differential Remove reset feed-through Oversampling ADC CCD Video signal conditioning DCDS Video Data OS DOS Digital low pass filter Correlated double sampling AnalogueDigital Reference samples (r i ) Signal samples (s i ) ADC output (ADU) CCD OS 20V

Slide 5 DCDS Prototype © 2011 RAL Space

Slide 6 Concept for J-PAS Use differential signals for best common-mode noise rejection Get √2 noise increase Use DCDS for optimal noise of system 100 MHZ sampling frequency; 500 kHz pixel rate DCDS better than analogue CDS and recovers some of the loss of differential mode. References Clapp SPIE 2012, DCDS Jorden et al. SPIE 2012, J-PAS