Infrared focal plane read-out circuit and output stage structure thereof

The invention relates to an output level structure of an infrared focal plane playback circuit, comprising a row output level which comprises N row amplifiers used for reading each row pixel signal; an output buffer level which is used for outputting the signal of the row output level in serial; N first switches which connect each row of amplifiers with the input end of the output buffer level; N second switches which connect the output end of the output buffer level with the positive input end of each row of amplifiers; wherein, the first switch and the second switch are controlled and conducted by row chosen signals which read the circuit, thus realizing that the signal is outputted in serial through the output buffer level. The invention also discloses a playback circuit which adopts the output level structure. In the output level structure and the applied infrared focal plane output circuit of the invention, the row amplifier and the whole structure of the output buffer level form a unit plus connection, thus the reading efficiency of the signal is improved greatly, and simultaneously the structure of the playback circuit is simplified and the power dissipation is reduced.