A 5.25-GHz CMOS Folded-Cascode Even-Harmonic Mixer for Low-Voltage ApplicationsMing-Feng Huang, Chung J. Kuo, Senior Member, IEEE, and Shuenn-Yuh Lee, Member, IEEEIEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 54, NO. 2, FEBRUARY 2006

指導教授 :林志明 級別 :體積所碩一

學生 :呂致遠Mail:s94662010@mail.ncue.edu.tw

民國 95年 3月 28 日

Outline

Abstract Introduction Schematic Microphotograph Experimental result Comparison Conclusion References

Abstract

5.25-GHz folded-cascode evenharmonic mixer (FEHM)

Reduce the headroom voltage A current reuse circuit Frequency-doubling technique Conversion gain of 8.3 dB IIP3 of 0.03 dBm Supply voltage of 0.9 V LO power of 5.5 dBm Power consumption of 4.95 mW IF frequency of 500 kHz

Introduction

The low-voltage RF integrated-circuit (RFIC) development for portable communication equipments has been a focus due to the advances in device technology for high-speed

applications. More and more designers have proposed RFIC for high-speed and low-voltage applications.

Direct conversion receiver

Schematic(EHM)fIF=fRF-2fLO

Current reuse circuit

Frequency-doubling

circuit

Folded technique

Lowvoltage

FEHM

High impedance

CancelledOdd

Harmonics

Current reuse circuit

Larger signal (i2LO )

Operational limitation

Schematic of the proposed full monolithic FEHM

ReduceHeadroom

voltage

Bias buffer

VDD=0.9VVRF=0.5VDD

MicrophotographL_tank:st

dNT:2.5

PADNOT ON WAFER

ON PCB

C_tank:mimcap

L1:stdNT:5.5

RF-RF+

LO-LO+

VRF

IF+IF-

?

VLOVDDGND

Experimental result

Simulation(CG vs Fingers and VLO)

CG VS Fingers

Measurement(CG VS LO power and VLO)

IIP2 & IIP3

Isolation VS LO power

NF VS IF

CG VS RF POWER

SUMMARY OF THE COMPARISON

Conclusion

FEHM with folded technique Verified by experimental data Large conversion gain Low complexity High operational frequency Direct conversion receivers.

REFERENCES

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