A radiation tolerant differential buffer amplifier provides amplification to small amplitude input signals. Circuitry is provided to selectively gate portions of the input signals for reduction of noise problems. Biasing circuitry sets a constant DC bias level for the amplifier to accomplish generally constant triggering of the amplifier.
In one embodiment of the present invention, photocurrents induced in the collector-base junction of a transistor by ionizing radiation incident thereon are compensated by the photocurrent generated by a plurality of series-connected diodes. One feature of the invention includes the selection of the junction areas of the diodes relative to that of the transistor to obtain a predetermined potential at an electrode of the transistor during the incidence of the ionizing radiation.
