學生 : 李國彰 指導教授 : 賴永齡老師 A 1.5V 2.4GHz CMOS Mixer with high linearity ( The 2004 IEEE Asia-Pacific Conference on Circuits and Systems, December 6-9, 2004 )

Outline Abstract Abstract Introduction Introduction Design methodology of mixers Design methodology of mixers Simulation Results Simulation Results Conclusion Conclusion Reference Reference

Abstract High linearity High linearity ISM band ISM band Modified Class AB transconductor Modified Class AB transconductor Common mode feedback circuitry Common mode feedback circuitry

Introduction GaAs, Bipolar >> high cost, complexity GaAs, Bipolar >> high cost, complexity CMOS CMOS Down-convert Down-convert Up-convert Up-convert IIP3, P 1dB IIP3, P 1dB

Introduction SFDR ( spurious-free dynamic range ) SFDR ( spurious-free dynamic range )

Design methodology of mixers Source degeneration Source degeneration CMOS g m Cell CMOS g m Cell Modified Class AB transconductor Modified Class AB transconductor C1 C2->DC-blocking C1 C2->DC-blocking M5-M8 ->promote isolation M5-M8 ->promote isolation

Design methodology of mixers M11-M14 -> switch M11-M14 -> switch M15 M16 R1 R2 ->load stage M15 M16 R1 R2 ->load stage M17-M21->CMFB circuit M17-M21->CMFB circuit ->stable dc level ->stable dc level ->conversion gain ->conversion gain

Simulation Results RF->2.4GHz RF->2.4GHz LO->2.3GHz LO->2.3GHz IF->100MHz IF->100MHz 3.73mA from a 1.5V 3.73mA from a 1.5V Tsmc 0.18 μm Mixed signal CMOS RF model Tsmc 0.18 μm Mixed signal CMOS RF model

Conclusion Transconductor -> linearity of a mixer Transconductor -> linearity of a mixer CMFB with the modified Class AB transconductor->improve IIP3, conversion gain CMFB with the modified Class AB transconductor->improve IIP3, conversion gain

Reference