1. 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

2. 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 15.75 mW at =1.5V. 2

3. Outline Introduction Circuit Design Implementation and Measurement Results Conclusion 3

4. Introduction DS-UWB technology can be applied to three frequency band (3.1-5.15 GHz, 5.8-10.6 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

5. RF front-end architecture 5

6. 架構圖 6

7. Design of the input stage Input balun / transconductance stage 7

8. Consideration on the LO port LO matching network 8

9. Design of the switch stage 9

10. Design of the output stage Output balun 10

11. Simulation Results Measured conversion gain and noise figure 11

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

13. Chip micrograph 13

14. Conclusion 14 RF Frequency Range6~10 GHz IF Frequency Range100MHz~2GHz LO Power@8 GHz-3dBm RF Return Loss>14dB LO Return Loss@8 GHz15dB Conversion-1.8~0.8dB@ 6~7.9GHz -3~-0.4dB@ 8.1~10GHz P1dB-6 dBm@ 6~7.9GHz -4 dBm@ 8.1~10GHz IIP3-1.4~0.4 dBm @ 6~7.9GHz -0.3~-1.8 dBm @ 8.1~10GHz LO-RF Isolation30dB Die Size1.06×1.11

15. Thanks for your attention. 15