  The Five-hundred-meter Aperture Spherical radio Telescope(FAST) was launched
on September 25,2016.From early 2017,we began to use the FAST wideband
receiver,which was designed,constructed and installed on the FAST in
Guizhou,China.The front end of the receiver is composed an uncooled Quad Ridge
Flared Horn feed(QRFH) with the frequency range of 270 to 1620 MHz,and a
cryostat operating at 10 K.Stephen et al. 2016We have coop-erated with the
Institute of Automation of the Chinese Academy of Sciences to developed the
China Reconfigurable ANalog-digital backEnd.The system covers the 3 GHz
operating band of FAST.The hardware part of the backend includes an Analog
Front-end Board,a wideband high precision Analog Digital Converter,and a FAST
Digital Back-end.Analog circuit boards, field programmable gate arrays, and
control computers form a set of hardware, software, and firmware platforms to
achieve flexible bandwidth requirements through parameter changes. It is also
suitable for the versatility of different astronomical observations, and can
meet specific requirements. This paper briefly introduces the hardware and
software of CRANE, as well as some observations of the system.
