電冷光燈經常被用在大型平面顯示器、電子商業看板、以及手機按鍵背光源．．．等等應用上，相關的設計產業早已蓬勃發展，其中又以廉價、高性能之DC/AC轉換器充當其驅動器最受矚目。目前業界現有的驅動電路其整體功率消耗約在60~120mW，只有在待機時才能將備用電流壓低到10nA，非常不適合應用在強調節能省電的可攜式電子產品上。再者，受限於振盪器與外部電阻與電感的限制，該類產品的操作頻率範圍通常只有300~700Hz，無法完全發揮電冷光燈的發光效益。
本論文利用電壓控制方式來改變交流輸出頻率，藉以控制電冷光燈的亮度，成功摒棄外部控制電阻與內部頻率調節器的需求，可大幅節省製造成本。同時為了精準控制振盪頻率範圍，特別注意元件的匹配，讓整體電路在製程與溫度變異下都不會過度地改變其操作特性，並藉由電路架構的創新改善，將核心電路壓控振盪器的功率消耗壓低到450nW，成功建立電冷光燈的超低功率驅動技術，並同時將操作頻率拉升到50Hz~1000Hz如此大的範圍，可明顯的改善電冷光燈亮度的問題。本電路以台積電2P4M 0.35μm的製程實現，晶片面積僅僅只有0.3 mm2，整體功率消耗為3mW，充分展現出廉價、低功率與高效能的優良特性，可望大幅提升相關產業的競爭能力。

Electroluminescent lamps have been tremendously adopted as large flat panel displays, commercial bulletin boards and keypad backlights of mobile phones. The corresponding industries have been blooming for a long time. The low cost but high performance DC/AC converter acting as EL driver is one of the most important products. The power consumption of the commercialized drivers is around 60~120mW which is much unsuitable for portable products. Only the stand-by current can be made as low as 10nA. Furthermore, due to the limit set by internal oscillator and external adjustment resistor, the operation frequency range of EL driver is merely 300~700Hz which can not fully explore the EL light conversion efficiency.
In this paper, the AC output frequency of EL driver is voltage-controlled to adjust the EL luminance. Neither external adjustment resistor, nor internal frequency regulator is required, and the production cost can be minimized. To accurately control the oscillation frequency range, special care is paid during design to device matching to eliminate the PVT sensitivity of the proposed circuit. The power dissipation of the core VCO is merely 450nW by the innovative modification of the circuit structure to successfully establish the ultra low power EL driving technology and enlarge the oscillation range to 50Hz~1000Hz which in turn enhance the EL luminance tremendously. The circuit is designed with TSMC 2P4M 0.35μm digital process. The chip size is only 0.3 mm2, and the overall power dissipation is as low as 3mW. It makes the proposed chip excellent for low cost, low power but high performance portable applications.

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