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A Low Flicker-Noise Direct Conversion Mixer in 0. 13 um CMOS with Dual-Mode DC offset Cancellation Circuits Y. Furuta, T. Heima, H. Sato and T. Shimizu. Silicon Monolithic Integrated Circuits in RF Systems, Topical Meeting on 10-12 Jan. 2007 Page(s):265 - 268 指導教授 : 林志明教授 學生 : 蕭文杉.

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  1. A Low Flicker-Noise Direct Conversion Mixer in 0. 13 um CMOS with Dual-Mode DC offset Cancellation CircuitsY. Furuta, T. Heima, H. Sato and T. Shimizu Silicon Monolithic Integrated Circuits in RF Systems, Topical Meeting on 10-12 Jan. 2007 Page(s):265 - 268 指導教授 :林志明教授 學生 : 蕭文杉

  2. Outline • ABSTRACT • INTRODUCTION • CIRCUIT DESIGN • MEASUREMENT RESULTS • CONCLUSION • REFERENCES

  3. ABSTRACT • A low flicker-noise CMOS mixer for multistandard receiver in 130-nm CMOS is presented. • The mixer which consists of an AC coupled passive mixer and a low noise buffer amplifier with CMFB achieves a low flicker noise corner frequency of 50 kHz. Dual-mode DC offset cancellation circuits are used to compensate the mixer DC offset for multi-standard communications. • It provides conversion gain of 13.2 dB, IIP3 of 4.5 dBm, DSB NF of 12.3 dB@100 kHz, white DSB NF of 11 dB, and output DC offset of less than 0.5 mV. This mixer consumes 5.5 mA at a supply voltage of 1.5 V.

  4. INTRODUCTION • A low cost RFIC for multi-standard wireless systems becomes a technical issue with diversification of radio systems. • One of the RF key building blocks is a mixer where low noise property and high linearity are required under low voltage operation.

  5. This paper presents a low noise CMOS mixer for GSM/W-CDMA direct-conversion receiver that strongly improves noise performance. Dual-mode DC offset cancellation (DCOC) circuits are used to calibrate output DC offset of the mixer for multi-standard communications.

  6. CIRCUIT DESIGN

  7. MEASUREMENT RESULTS

  8. CONCLUSION • A low flicker-noise direct conversion mixer for multistandard receiver is proposed. • It shows a significant improvement in noise performance. The AC coupled passive mixer and low noise buffer amplifier contributes to the reduction of the mixer flicker noise. • Dual-mode DCOC circuits is introduced to calibrate the mixer DC offset for multi-standard communications.

  9. REFERENCES • [1] B. Razavi, "Design Considerations for Direct-Conversion Receivers", IEEE trans. Circuits Syst. II, vol. 44, pp.428- 435, June 1997. • [2] V. Vidojkovic, etal, "A Low-Voltage Folded-Switching Mixer in 0.18-mm CMOS", IEEE J. Solid-State Circuits, vol 40, pp.1259-1264, 2005 • [3] R. Bagheri, etal, "An 800MHiz to 5GHz software-defined radio receiver in 90nm CMOS", in IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, Feb. 2006, pp.480 481. • [4] Y Taur and T. Ning, Fundamentals of Modern VLSI Devices. Cambridge, U.K: Cambridge Univ. Press, 1998.

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