BeetleFE family are prototype chips for the preamplifier/shaper circuitry of the Beetle chip.
Beneath there are links to different versions of the BeetleFE.
BeetleFE 1.0 - The first prototypes of preamp/shapers, submitted april 1999
BeetleFE 1.1 - Test chip with frontends capable of higher detector occupancies, submitted may 2001
BeetleFE 1.2 - Test chip with frontends capable of higher detector occupancies, submitted may 2001