| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 85 === The quadrature amplitude modulation (QAM) and the
vestigialsideband modulation (VSB) are two competitive
modulations for hybridfiber/coax CATV networks. In this thesis
we focus on dual-mode64-QAM/8-VSB transmission system which
proposed by C.K.Wang andM.T.Shiue in characterization,
implementation, and a few simple testing methodswill be
presented also. Three key prototype chips of this
architecturehave been implemented by K.H. Huang and C.C.Lu. The
first chip is adual-mode 64-QAM/8-VSB digital modulator for high
speed digitalCATV modem, which is designed by C.C.Lu and
facbricated in TSMC 0.8um CMOS SPDM process. And the second one
is a dual-loopdigital automatic gain control (DAGC) chip
finished in 1996 usingTSMC 0.8um CMOS SPDM process also. The
last chip isa 2V low voltage low power VGA chip designed by K.H.
Huang in 1996 by UMC 0.8um CMOS DPDM process. All the threechips
will be tested separately. After that, the testing results is
comparedwith simulation data to prove the original designs.
Finally, we build thetesting boards with these chips onthem and
check their performance with system specification.
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