Photodiode array readout circuit

Figure I. Schematic diagram of photodiode array readout circuit. Cj diode Capacitance. Cj readout capacitor.

We have used a Reticon photodiode array and an Optical Multi-channel Analyzer to measure optical density changes Induced in photovisual materials using this technique. The Reticon is a device which incorporates a linear high density monolithic array of silicon photodiodes with integrated scanning circuits for serial readout. The array consists of 128... 

A diode array consists of a series of photodiode/ capacitor parallel circuits positioned side by side on a silicon chip. Each such circuit is connected via its own solid-state switch controlled by a shift register, to a common output line. The shift register is controlled over a quartz oscillator (timer). The readout cycle, corresponding to the illumination time, falls in the 100 ms range. A schematic diagram of the diode array is given in Figure 7. 

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