A CTIA ROIC based on odd & even row time-multiplexing
In this paper,a high dynamic range ROIC for short-wavelength infrared focal plane arrays are presented.A capacitive transimpedance amplifier structure is used for the input stage.By time-multiplexing the pixel op-amps in the odd-even rows as comparators,the conversion gain of each pixel can be individuallyswitched and adaptivelyadjusted according to the background radiation,and the modules such as integrating capacitors,sample-and-hold circuits,and source followers in the pixels are shared by the odd-even pixels to save the area and improve the freedom of pixel de-sign.This structure increases the full-well capacity,reduces the equivalent noise charge number,and improves the dy-namic range without increasing the pixel area.The pixel array size of the readout circuit is 64 x 64 with a pixel pitch of 30 μm,and the simulation results show that the readout circuit has a noise charge of 57.8 e-,a full-well capacity of 12.5 Me-,a dynamic range of 106 dB,and a readout rate up to 10 MHz.
万方数据
维普
