The　modulated　wideband　converter　(MWC)　is　a　sampling　system　that　realizes　the　sub-Nyquist　sampling　rate　by　using　the　compressed　sensing　(CS)　theory.　This　paper　presents　an　analog　front-end　circuit　for　a　modulated　wideband　converter,　which　consists　of　four　channels.　Each　channel　is　composed　of　a　mixer　and　a　low-pass　filter.　The　mixer　adopts　a　passive　structure,　which　can　achieve　a　higher　degree　of　linearity　compared　with　the　traditional　Gilbert　structure.　The　filter　adopts　a　GM-C　structure,　which　can　consume　lower　and　easily　achieve　higher　operating　frequency　compared　with　the　traditional　RC　structure.　In　this　paper,　the　smic180nm　CMOS　process　is　used　for　simulation　verification.　The　front-end　circuit　can　process　input　signals　from　DC　to　1GHz,　and　the　reconstruction　of　dual-band　signals　with　a　maximum　frequency　of　200MHz　is　verified.　The　normalized　mean　square　error　(NMSE)　is　less　than　-20dB.　　©　2022　IEEE.