ABSTRACT Today,TV tuner takes a very important role in the future development of the Digital Signal Television.From cable to wireless,Digital Signal Television becomes more necessary in our life.In the TV tuner receiver system,cable signal and wireless signal can be received and decode,then transferred to digital signal and sent to backend for further signal processing. An up-conversion wide band mixer used for the TV tuner system is designed in this paper,with the frequency range from 56MHz to 806MHz and output central frequency of 1.1GHz.TV tuner adopts double conversion super-heterodyne architecture.Firstly,it converts the input wide band RF signal to a higher 1.1GHz intermediate frequency,and secondly,down-convert the 1.1GHz frequency to 44MHz intermediate frequency for DSP at backend.From the analysis and comparison of the advantage and disadvantage of the Active and Passive mixer,I decide to use Active Gilbert mixer topology,because the noise figure and conversion gain performance is better than the others,but the loss of the linearity performance must be considered.Series of linearity improvement idea are put forward and adopted in this paper to make up for the loss of the linearity performance. With the Chartered 0.35um library file and spectreRF simulation tool,my design is proved that the designed circuit can meet the system'requirement from the simulation result. The up-conversion is taped out in chartered 0.35um CMOS process.For the sake of measurement,the RF and LO bias circuit are added to the up-conversion circuit.At the end of the paper,the core measurement plan is put forward.Because the wide band match problem can not be resolved,the measurement plan is just based on the point frequency input and point frequency output,and both the input impendence and the output impendence are all 502. Keywords:up-conversion,down-conversion,Active mixer,Passive mixer,image signalI ABSTRACT Today, TV tuner takes a very important role in the future development of the Digital Signal Television. From cable to wireless, Digital Signal Television becomes more necessary in our life. In the TV tuner receiver system, cable signal and wireless signal can be received and decode, then transferred to digital signal and sent to backend for further signal processing. An up-conversion wide band mixer used for the TV tuner system is designed in this paper, with the frequency range from 56MHz to 806MHz and output central frequency of 1.1GHz. TV tuner adopts double conversion super-heterodyne architecture. Firstly, it converts the input wide band RF signal to a higher 1.1GHz intermediate frequency, and secondly, down-convert the 1.1GHz frequency to 44MHz intermediate frequency for DSP at backend. From the analysis and comparison of the advantage and disadvantage of the Active and Passive mixer, I decide to use Active Gilbert mixer topology, because the noise figure and conversion gain performance is better than the others, but the loss of the linearity performance must be considered. Series of linearity improvement idea are put forward and adopted in this paper to make up for the loss of the linearity performance. With the Chartered 0.35um library file and spectreRF simulation tool, my design is proved that the designed circuit can meet the system’ requirement from the simulation result. The up-conversion is taped out in chartered 0.35um CMOS process. For the sake of measurement, the RF and LO bias circuit are added to the up-conversion circuit. At the end of the paper, the core measurement plan is put forward. Because the wide band match problem can not be resolved, the measurement plan is just based on the point frequency input and point frequency output, and both the input impendence and the output impendence are all 50Ω . Keywords：up-conversion, down-conversion, Active mixer, Passive mixer, image signal