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Published byMagnus Collins Modified over 9 years ago
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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 )
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Outline Abstract Abstract Introduction Introduction Design methodology of mixers Design methodology of mixers Simulation Results Simulation Results Conclusion Conclusion Reference Reference
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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
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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
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Introduction SFDR ( spurious-free dynamic range ) SFDR ( spurious-free dynamic range )
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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
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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
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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
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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
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Reference
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