upd8670a Renesas Electronics Corporation., upd8670a Datasheet - Page 17

• Manufacturer Part Number: upd8670a
• Description: 7400 Pixels Ccd Linear Image Sensor
• Manufacturer: Renesas Electronics Corporation.

10. Register imbalance : RI
11. Random noise : σ
12. Shot noise :
RI (%) =
The rate of the difference between the averages of the output voltage of Odd and Even pixels, against the average
output voltage of all the valid pixels.
Random noise σ is defined as the standard deviation of a valid pixel output signal with 100 times (= 100 lines)
data sampling at dark (light shielding).
This is measured by the DC level sampling of only the signal level, not by CDS (Correlated Double Sampling).
Shot noise is defined as the standard deviation of a valid pixel output signal with 100 times (= 100 lines) data
sampling in the light. This includes the random noise.
The formula is the same with that of random noise.
σ
(mV) =
2
n
∑
j = 1
n
2
σ
100
Σ
i = 1
shot
(V
1
n
(V
2j – 1
∑
100
j = 1
n
i
V
– V)
– V
j
2j
2
)
V
× 100
n
V
OUT
j
: Number of valid pixels
: Output voltage of each pixel
, V =
V
i
: A valid pixel output signal among all of the valid pixels
100
Data Sheet S17147EJ2V0DS
1
100
Σ
i = 1
V
i
V
V
V
100
1
2
line 1
line 2
line 100
µ
PD8670A
17