具溫度及電壓變異補償技術之 非石英式時脈產生器;Crystal-less Clock Generator with Temperature and Supply Voltage Compensation

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/72193

Title:	具溫度及電壓變異補償技術之非石英式時脈產生器;Crystal-less Clock Generator with Temperature and Supply Voltage Compensation
Authors:	葉家齊;Yeh,Chia-Chi
Contributors:	電機工程學系
Keywords:	非石英式時脈產生器;溫度補償;電壓補償;crystal-less clock generator;temperature compensation;voltage compensation
Date:	2016-07-25
Issue Date:	2016-10-13 14:31:20 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文提出具溫度對頻率補償機制之非石英式時脈產生器，針對低頻及高頻應用的不同需求，共提出兩種電路架構。第一種為8 MHz非石英式時脈產生器，將傳統弛張振盪器的架構進行改良，對於供應電壓源以及溫度漂移有較佳的抵抗能力，並在脈波產生器對迴路延遲時間做溫度補償。在晶片溫度漂移為-40 °C至150 °C的範圍內，量測到的輸出頻率變異量最佳值為10.9 ppm/ °C。在供應電源漂移為±10 %的範圍內，量測到的輸出頻率變異量小於0.28 %。第二種為具十六相位輸出之768 MHz非石英式時脈產生器，架構中環型振盪器的供應電源來自輸出電壓溫度係數為正的穩壓器，可以補償電晶體之載子遷移率對於輸出頻率的負溫度效應，並在環型振盪器中加入溫度補償係數之微調電路，使輸出頻率在不同的製程漂移下都能達到最佳的溫度補償效果。其操作頻率為768 MHz時，溫度漂移為 -40 °C至150 °C的範圍內，量測到的輸出頻率變異量最佳值為110.7 ppm/ °C。在供應電源漂移為±10 %的範圍內，量測到的輸出頻率變異量小於0.96 %。故本論文設計之非石英時脈產生器可以在系統因硬體面積受限而無法使用石英振盪器時，提供可靠之穩定時脈，當作時脈倍頻器的參考訊號，或是取代整個時脈倍頻器加上傳統石英振盪器的組合，達到較小面積和低成本的設計。;Two on-chip crystal-less clock generator (CLCG) with temperature compensation are presented. For both high speed and low speed applications, this thesis contain two kinds of architectures. The first one is a 8 MHz relaxation oscillator. The voltage and current reference circuits have high immunities of temperature and supply voltage variations. A proposed pulse generator is used to eliminate the loop delay time variation caused by temperature drift. Under the temperature range is form -40 °C to 150 °C, the measured output frequency accuracy is 10.9 ppm/°C. Under the ±10 % supply voltage, the output frequency variations is less than 0.28%. The second architecture is a 768 MHz multi-phase clock generator with temperature compensation. The supply voltage of the multi-phase ring oscillator is from a regulator which has positive temperature coefficient that can compensate the output frequency drift caused by temperature variation. Besides, we apply a temperature coefficient calibration circuit to make sure the output frequency has higher accuracy in the process variations. The output frequency accuracy of 768 MHz is 110.7 ppm/°C, under the temperature range is form -40 °C to 150 °C. In some applications limited by hardware area, traditional crystal oscillator can be replaced with these crystal-less clock generator, and it would consume less cost and area.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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