摘 要: 為了降低CCD驅動電路的功耗,設計了基于共模扼流圈的CCD驅動電路。采用CCD驅動器產生低電壓的驅動信號,然后利用共模扼流圈進行電壓幅度的放大。由于CCD驅動器的電壓幅度降低了,使得CCD驅動器的自身功耗大幅度下降。由于共模扼流圈的差模電感很小,有效地避免了和CCD的容性負載產生諧振,因此可以保證驅動信號的質量。對設計的電路進行了電路板制作和測試。實驗結果表明,該電路在保證驅動信號質量的前提下,可以有效地降低驅動電路的功耗。
關鍵詞: 共模扼流圈; 高速CCD; 驅動電路; 功耗
中圖分類號: TN386.5?34 文獻標識碼: A 文章編號: 1004?373X(2013)13?0157?03
High?speed CCD drive circuit based on common mode choke
XUE Xu?cheng, FU Yao, HAN Cheng?shan
(Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China)
Abstract: In order to reduce the power consumption of CCD drive circuit, a CCD driving circuit based on common mode choke was designed. The CCD driver produces low voltage driving signals and the common mode choke amplifies the voltage amplitude of the driving signals. For the lowering of the CCD driver voltage, the power consumption of the driver itself is reduced substantially. Because of the small DM inductor of the common mode choke, the resonance with capacitive load of CCD could be avoided effectively. So the quality of driving signals can be guaranteed. The printed circuit board is made to test the driving circuit. Experimental results show that, this circuit can reduce the power consumption effectively and in the context of the driving signal quality is acceptable.
Keywords: common mode choke; high?speed CCD; driving circuit; power consumption
0 引 言
電荷耦合器件(CCD)在光電成像領域獲得了廣泛的應用,它具有高速、低噪聲、寬動態范圍以及線性響應等優點[1],然而要使CCD正常工作,需要成像電路的支持。其中,CCD驅動電路是成像電路的重要組成部分,驅動電路負責把CCD收集的電荷包通過移位寄存器移動到輸出節點進行信號電壓的輸出[2]。由于是串行移位,因此需要高速的驅動電路,而在高速成像領域,驅動電路的工作速度更高。此外,CCD驅動波形的電壓幅度往往很高,而CCD的移位寄存器是電容性負載,高速大電壓幅度驅動電容性負載需要較大的功耗,因此,基于CCD的成像系統功耗都相對較大,功耗大會導致CCD驅動器溫度較高,溫度高會影響系統的可靠性和壽命。針對這個問題,采用CCD驅動器首先產生低電壓的驅動信號,然后利用共模扼流圈進行電壓的放大。……