CSE598A Analog Mixed Signal CMOS Chip Design FM Mixer CMOS Realization (Final Presentation) Zhang Yi

Outline: Summary of Mixer Design Final results in Project Further study CSE598A Analog Mixed Signal CMOS Chip Design

Mixer ‘s Function in RF system Down conversion in receiver Realize Gilbert Mixer by CMOS Technologies

Critical points of Mixer: Image Frequency Conversion Loss Noise Figure Intermodulation Distortion Port-to-Port Isolation CSE598A Analog Mixed Signal CMOS Chip Design Mixer ‘s Function in RF system

CSE598A Analog Mixed Signal CMOS Chip Design Realize Gilbert Mixer by CMOS Technologies 1dB Compression point Intermodulation Distortion Critical points of Mixer: Image Frequency Conversion Loss Noise Figure Intermodulation Distortion Port-to-Port Isolation

Final schematic in Project

Output improved Convert differential to singled ended v out RFRF RFRF RIRI RIRI - +

Optimized results in Project Schematic determined from calculation: Transistor size: 250u/600n Rs and Rload: Rs=0(ohm) Rload=500ohm RF and LO source: RF=0.05sin(w1t), LO=0.05sin(w2t)

IF signal from Gilbert cell

Final Design Simulation results: 1.Conversion gain 2.Isolation

Conclusion based on simulation Width Vs conversion gain: LO input transisters’ width affect the conversion gain. RF input transisters’ width doedn’t affect the conversion gain. IM3 point -overdrive voltage Vs power consumption: Need further study. Rs Vs linearity: Rs doesn’t affect the linearity much at relative low frequency.

CSE598A Analog Mixed Signal CMOS Chip Design Difference between Expected and Actual ParameterExpected Specification Actual Specification Units Frequency150>150MHz Noise Figure (DSB)<10<20dB IM3 Intercept Point (Input) >20dBm Voltage Gain>8>20dB Power consumption<100<80ohms Source impedance50 ohms Load impedance500 ohms Voltage Supply3.03.3V Design criteria and actual specification for the mixer Further modify the circuit to reach all design criteria

Further Study Further study on Intermodulation performance. Further study on power dissipation.