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Digital Correlated Double Sampling for ZTF

Digital Correlated Double Sampling for ZTF. Roger Smith and Stephen Kaye California Institute of Technology. Digital CDS is very simple. Part of Single Board CCD controller, outside telescope beam. Vacuum Interface Board, in Dewar. Is 10 MHz sampling adequate at 1 Mpixel /s ?

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Digital Correlated Double Sampling for ZTF

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  1. Digital Correlated Double Sampling for ZTF Roger Smith and Stephen KayeCalifornia Institute of Technology

  2. Digital CDS is very simple Partof Single Board CCD controller, outside telescope beam. Vacuum Interface Board, in Dewar Is 10 MHz sampling adequate at 1 Mpixel/s ? If so, successive approximation ADC can have excellent 16 bit performance, size, power. Twinax cable Preamp in dewar Simple Postamp-ADC Virtex 5 FPGA Serial register Coadder USB2 Commercial fiber optic USB extender. Serial register Coadder 4ch * 1 Mpixel/s * 32 bit = 128 mbit/s USB2 is rated at 400mbit/s.

  3. Transfer function2, no filter Aliases Passband Dual slope integrator Nyquist

  4. Transfer function2, 1 pole anti-aliasing 1 Pole Filter at fc = 4Mhz Is not good enough Significant aliased power remains

  5. 5+5 Read noise voltage only 1% more than dual slope integration.

  6. 6+6

  7. 7+7

  8. Backup slides

  9. E2v CCD231-C6: “typical” noise Gain for 300,000 e- full well  4.6 e-/ADU >9e- noise per sample = 1.95 ADU Quantization degrades noise by √(1+0.5/1.952)-1=3 % Can reduce by choosing higher filter cut-off or lower e-/ADU Fc = 4MHz

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