Disk 1 Signal for 6 levels of light injection with a red LED, Section 5, Photo gate connected directly to the drain

Fig. 1, Buffer output from a single pixel in section 5 (photo gate connected to drain) for 6 levels of charge injection. The first dip is during reset when the column current source is not connected to a pixel. The peak is the signal immediately after reset. The LED is flashed ~2ms later causing the sudden drop in output voltage. The light pulse is varied by the width of the LED pulse from 0 to 250 ns. The photo gate has a DC bias of 1.096 volts

Fig. 2 Signal from 5 levels of LED light injection minus 0 LED level signal. Note the slow signal collection time, several ms to reach the full charge. The pixel response appears to be roughly linear with light input.

Fig. 3 Same as fig. 2, but with sign of voltage removed

Fig. 4 Same as fig. 3, but with adjusted time scale