What is Correlated double sampling (CDS)?
Taking the difference between a pixel's voltage just after reset and its voltage when the signal is read. It removes reset noise and per-pixel offsets.
Correlated double sampling (CDS) in the explanations
CDS samples the floating diffusion's output right after reset and again after the photodiode charge is transferred, taking the difference as the signal.
What is the purpose of correlated double sampling (CDS) use…Image sensors remove it with correlated double sampling.
When a voltage is sampled onto a capacitor C through a swit…Since filters cannot cut off instantly, practical systems add margin: audio CDs sample at 44.1 kHz, using 20–22.05 kHz as the filter's transition band.
What sampling frequency is needed to sample an analog signa…
Questions that mention Correlated double sampling (CDS) (6)
- What is the purpose of correlated double sampling (CDS) used in CMOS image sensor readout?
- When a voltage is sampled onto a capacitor C through a switch, what is the RMS thermal noise voltage left on the capacitor? (k: Boltzmann constant, T: absolute temperature)
- What sampling frequency is needed to sample an analog signal containing components up to 20 kHz without aliasing?
- What is the sampling frequency of a music CD?
- In the typical four-transistor pixel of a CMOS image sensor, which transistor moves the charge from the photodiode to the floating diffusion?
- What is the noise called that appears the same way at the same positions every time because of pixel-to-pixel variation in characteristics?
Related terms
CMOS image sensor Photodiode Thermal noise (Johnson noise) Aliasing Sampling theorem Nyquist frequency Pinned photodiode Fixed-pattern noise Dark current Backside illumination (BSI)