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系所 : 積體電路設計研究所 指導教授 : 林志明 學生 : 鄭士豪

A Power-Optimized CMOS LC VCO with Wide Tuning Range in 0.5-V Supply Dongmin Park , Seonghwan Cho IEEE International Symposium on Circuits and Systems (ISCAS) Page(s): 21-24 May 2006. 系所 : 積體電路設計研究所 指導教授 : 林志明 學生 : 鄭士豪. Outline. ABSTRACT INTRODUCTION

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系所 : 積體電路設計研究所 指導教授 : 林志明 學生 : 鄭士豪

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  1. A Power-Optimized CMOS LC VCO with Wide Tuning Range in 0.5-V SupplyDongmin Park , Seonghwan Cho IEEE International Symposium on Circuits and Systems (ISCAS) Page(s): 21-24 May 2006 系所:積體電路設計研究所 指導教授:林志明 學生:鄭士豪

  2. Outline • ABSTRACT • INTRODUCTION • DESIGN CONSIDERATIONS OF POWER-OPTIMIZED VCOs A.The Topology of Low-voltage VCOs B.L,C Optimization for Low-Power • WIDE TUNING RANGE IN NEAR THRESHOLD SUPPLY VOLTAGE • SIMULATION RESULTS • CONCLUSIONS

  3. ABSTRACT(1) • The VCO achieves low power by optimum selection of inductance in the L-C tank. • Despite the low power supply near threshold voltage, the VCO achieves wide tuning range by using a voltage-boosted digital tuning technique. • It is shown that the power consumption of VCO with a required output swing and phase noise can be minimized if the inductance is chosen such that its LQ and Q/L is maximized.

  4. ABSTRACT(2) • To increase the tuning range, a digital tuning method is used where the output voltage of the VCO is exploited to generate a high voltage for the switches in the digital tuning scheme. • The proposed VCO achieves phase noise of -120 dBc/Hz at 1-MHz offset and 18 % tuning range while consuming 660 μA in 0.5-V supply. • Figure-of-merit with tuning range of the proposed VCO is -197.1 dB,which is the lowest among the recent state-of-the-art low-voltage VCOs.

  5. INTRODUCTION • Due to the explosive growth of low-cost mobile wireless hand-held devices, power consumption has become one of the most important design criteria in digital, analog and RF circuits. • However, in analog and RF circuits, voltage scaling cannot be sustained mainly due to noise reasons and hence the analog and RF circuits must rely on high supply voltage. • Low-voltage VCOs are successfully demonstrated but the limited tuning range make it difficult for the VCOs to be used in practical systems.

  6. DESIGN CONSIDERATIONS OF POWER-OPTIMIZED VCOs • A.The Topology of Low-voltage VCOs

  7. DESIGN CONSIDERATIONS OF POWER-OPTIMIZED VCOs • B.L,C Optimization for Low-Power(1)

  8. DESIGN CONSIDERATIONS OF POWER-OPTIMIZED VCOs • B.L,C Optimization for Low-Power(2)

  9. WIDE TUNING RANGE IN NEAR THRESHOLD SUPPLY VOLTAGE

  10. SIMULATION RESULTS(1)

  11. SIMULATION RESULTS(2)

  12. CONCLUSIONS

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