Common source cascode amplifiers for integrating IR-FPA applications

Details Common source cascode amplifiers for integrating IR-FPA applications Common source cascode amplifiers for integrating IR-FPA applications

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989tidt.work..135w&link_type=abstract

In NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop p 135-146 (SEE N90-21313 14-35)

Astronomy and Astrophysics

Astronomy

Amplifiers, Astronomy, Circuits, Cmos, Infrared Detectors, Infrared Radiation, Capacitance, Electrons, Noise Intensity, Noise Measurement, Noise Reduction, Readout

Scientific paper

Space based astronomical infrared measurements present stringent performance requirements on the infrared detector arrays and their associated readout circuitry. To evaluate the usefulness of commercial CMOS technology for astronomical readout applications a theoretical and experimental evaluation was performed on source follower and common-source cascode integrating amplifiers. Theoretical analysis indicates that for conditions where the input amplifier integration capacitance is limited by the detectors capacitance the input referred rms noise electrons of each amplifier should be equivalent. For conditions of input gate limited capacitance the source follower should provide lower noise. Measurements of test circuits containing both source follower and common source cascode circuits showed substantially lower input referred noise for the common-source cascode input circuits. Noise measurements yielded 4.8 input referred rms noise electrons for an 8.5 minute integration. The signal and noise gain of the common-source cascode amplifier appears to offer substantial advantages in acheiving predicted noise levels.

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