InGaAs linear image sensors
G9211 to G9214 series
G9205 to G9208 series
Near infrared image sensors (0.9 to 1.67
μm
/
2.55
μm)
The G9211 to G9214/G9205 to G9208 series InGaAs linear image sensors are specifically designed for near infrared multichannel
spectrophotometry. These linear image sensors consist of an InGaAs photodiode array, a charge amplifier array, an offset com-
pensation circuit, a shift register and a timing generator formed on a CMOS chip. The charge amplifier array is made up of CMOS
transistors connected to each pixel of the InGaAs photodiode array. Signals from each pixel are read out in charge integration
mode to achieve high sensitivity and stable operation in the near infrared spectral range. The package is hermetically sealed for
high reliability.
Signal processing circuits on the CMOS chip can be selected from two conversion efficiencies (CE) by external voltage. The image
sensor operates over a wide dynamic range when CE=16 nV/e- and delivers high gain when CE=320 nV/e-.
Features
Wide dynamic range
Low noise and low dark current
Two selectable conversion efficiencies
Anti-saturation circuit
CDS circuit
*
1
Offset compensation circuit
Simple operation (by built-in timing generator)
*
2
High resolution: 25
μm
pitch (512 ch)
Low cross-talk
256 ch: 1 video line
512 ch: 2 video lines
Applications
Near infrared multichannel spectrophotometry
Radiation thermometry
Non-destructive inspection
Related products
InGaAs multichannel detector head C8061-01, C8062-01
Multichannel detector head controller C7557
*1:
A major source of noise in charge amplifiers is the reset noise generated when the integration capacitance is reset. A CDS (correlated
double sampling) circuit greatly reduces this reset noise by holding the signal immediately after reset to
fi
nd the noise differential.
*2:
Different signal timings must be properly set in order to operate a shift register. In conventional image sensor operation, external PLDs
(programmable logic device) are used to input the required timing signals. However, the G9211 to G9214/G9205 to G9208 series image
sensors internally generate all timing signals on the CMOS chip just by supplying CLK and RESET pulses. This makes it simple to set the
timings.
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1
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