C. Temporal Read Noise
In order to measure the input-referred noise of the presented
imager, the output voltage noise is first measured. Then it is
referred to the input using the readout chain conversion gain.
This operation was applied to 5000 pixels after performing
100 readouts with a CDS of 5 μs and a line (pixel) readout
time of 25 μs. The in-pixel SF current bias is set to 1.5 μA
and the TX is off. The column-level amplifier gain is set
to 64, limiting the bandwidth to about 300 kHz in order to
reduce the thermal noise and the noise originating from the
next stages. Fig. 13 shows the resulting histogram of the inputreferred
TRN. The golden pixels of the array feature a read
noise as low as 0.25 e−
rms. The maximum of the histogram
corresponds to 0.48 e−
rms. The inset of Fig. 13 shows the
histogram in a log scale highlighting a minority of pixels
featuring an RTS noise of a few e−
rms. Note that the noise estimation
shown in Fig. 6 takes only into account the 1/ f noise.
The input-referred noise of 0.48 e−
rms measured at the peak of