A 1.5-V 6-10-GHz Low LO-Power Broadband CMOS Folded-Mirror Mixer for UWB Radio H.-W. Chung, H.-C. Kuo, and H.-R. Chuang Institute of Computer and Communication Engineering, Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan, R. O. C Presenter : Meng-Long Hsin 1

Abstract A 6-10 GHz broadband down conversion mixer for UWB radio is presented. The broadband mixer only needs a low LO power of -3 dBm which can reduce the effect of LO leakage and DC offset. The broadband mixer exhibits a maximum conversion gain of 0.8 dB, and a DC power consumption of mW at =1.5V. 2

Outline Introduction Circuit Design Implementation and Measurement Results Conclusion 3

Introduction DS-UWB technology can be applied to three frequency band ( GHz, GHz, and both of them). The LO frequency is chosen at 8 GHz and the mixer directly down converts the 6-10 GHz RF signal into the 0-2 GHz IF frequency band. 4

RF front-end architecture 5

架構圖 6

Design of the input stage Input balun / transconductance stage 7

Consideration on the LO port LO matching network 8

Design of the switch stage 9

Design of the output stage Output balun 10

Simulation Results Measured conversion gain and noise figure 11

Simulation Results(cont.) Measured input P1dB and IIP3 Measured LO-RF,LO-IF and RF-IF isolation 12

Chip micrograph 13

Conclusion 14 RF Frequency Range6~10 GHz IF Frequency Range100MHz~2GHz LO GHz-3dBm RF Return Loss>14dB LO Return GHz15dB 6~7.9GHz 8.1~10GHz P1dB-6 6~7.9GHz ~10GHz IIP3-1.4~0.4 6~7.9GHz -0.3~ ~10GHz LO-RF Isolation30dB Die Size1.06×1.11

Thanks for your attention. 15