Under 0.18 Um Cmos Process Respectively Applied To High Performance And Low Power Consumption Of The Design Of The Mixer

Mixer plays the key role of jointing the RF signals, IF signals and carriers together, its detailed performances for different applications vary intensively. This thesis presents an active mixer serving for2.4GHz Low-Power RF transceiver and a passive mixer of high performance serving for DTV-Tuner in0.18um CMOS process.Several RF receiver architectures are introduced at the beginning, more analysis focuses on the characters of2.4GHz Low-IF structure and DTV-Tuner with DVB-T communication standard structure. In addition, analyzing methods of active mixer and passive mixer performances and comparison of advantages and disadvantages in the two styles of mixers are presented later, more discussions are about principles of choosing mixer structures for the architectures in this paper.Traditional Double-Conversion Gilbert structures are adopted for Low-Power active mixer, the First-Stage mixer must implement high gain to lessen the influences from series stages, for which, a LO-Buffer similar with RF power amplifier is designed to provide proper LO signals. The whole design is completed in TSMC0.18um1P4M Mixed-Signal process including circuits and layout design and relative simulations, input frequency ranges from50MHz to862MHz, conversion gain of Two-Stage mixers are15dB, noise figure is less than14dB, IIP3exceeds+5dBm, power dissipation is2.7mW.Passive mixer design includes Trans-Conductor-Amplifier, switching quads, Trans-Impedance-Amplifier and supporting modules, techniques of enhancing linearity and lowering noise figure are explored and presented, simultaneously, a method to calibrate I/Q phase mismatching is adopted. This design is completed in TSMC0.18um1P5M CMOS Mixed-Signal process, input frequency ranges from50MHz to862MHz, conversion gain arrives at17dB, Double-Side-Band noise figure fluctuates around12dB in IF frequency band, IIP3is about13dBm with the variation of carrier frequencies, IIP2exceeds50dBm, Image-Rejection-Ratio is about45dB without phase mismatching calibration.Both of the two mixers designed in this thesis meet the requirements of respective applications,2.4GHz transceiver is already taped out, DTV-Tuner is to be taped out in June, following work such as test and improvements will continue.