  The China initiative Accelerator Driven System, CiADS, physics design adopts
$162.5 \,\mathrm{MHz}$, $325 \,\mathrm{MHz}$, and $650 \,\mathrm{MHz}$
cavities, which are driven by the corresponding radio frequency (RF) power
system, requiring frequency translation front-end for the RF station. For that
application, a general-purpose design front-end prototype has been developed to
evaluate the multi-frequency point supported design feasibility. The difficult
parts to achieve the requirements of the general-purpose design are reasonable
device selection and balanced design. With a carefully selected low-noise
wide-band RF mixer and amplifier to balance the performance of multi-frequency
supported down-conversion, specially designed local oscillator (LO)
distribution net to increase isolation between adjacent channels, and external
band-pass filter to realize expected up-conversion frequencies, high
maintenance and modular front-end general-purpose design has been implemented.
Results of standard parameters show an $R^2$ value of at least $99.991\%$ in
the range of $-60 \sim 10\,\mathrm{dBm}$ for linearity, up to
$18\,\mathrm{dBm}$ for P1dB, and up to $89\,\mathrm{dBc}$ for crosstalk between
adjacent channels. The phase noise spectrum is lower than $80\,\mathrm{dBc}$ in
the range of $0 \sim 1\,\mathrm{MHz}$, and cumulative phase noise is
$0.006^\circ$; amplitude and phase stability are $0.022\%$ and $0.034^\circ$,
respectively.
