光導開關應用於電路信號的取樣與固定

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Title:	光導開關應用於電路信號的取樣與固定 Signal Sample-and-Hold Using Photoconductive Switches
Authors:	吳朝甲
Date:	1990-06
Issue Date:	2011-12-07 11:52:31 (UTC+8)
Publisher:	臺北市立師範學院
Abstract:	中文摘要　　被研究的光導開關是製作在銦磷化合物(I<sub>n</sub>P)的光導材料上，以面積大小為50×50平方微米的方形面鍍上互相交叉的手指形電極而成。此種開關在無光線照射時的電阻大於10<sup>7</sup>歐姆，電容則甚小，約為3×10<sup>-14</sup>法拉。如用頻率為10<sup>8</sup>週，峯值光功率18毫瓦，工作時距約為2×10<sup>-10</sup>秒的脈衝雷射光照射，這個開關的平均通路電阻為3×10<sup>3</sup> 歐姆，持續了2×10<sup>-9</sup>秒的時距，另有8×10<sup>-9</sup>。秒為斷路時距，在斷路的時間，因為尚有微量的二極體雷射自發光照射在開關上，所以斷路電阻不是大於10<sup>7</sup>「歐姆，而是大約為10<sup>5</sup>歐姆。信號取樣與固定的執行情況是輸入信號電壓頻率為10<sup>7</sup>週，振幅是1.0伏特，取樣次數每秒10<sup>8</sup>次，光導開關用200微微秒脈衝雷射光照射，取樣的類比信號經由場效電晶體射極偶合輸出。在時距為2×10<sup>-9</sup>秒的電通路內，輸出信號的最大振幅為78毫伏特，因為這時開關電阻大約3.1×10<sup>3</sup>歐姆，而在電斷路的8×10<sup>-9</sup>秒內，可得19毫伏特的最大漏電輸出電壓，這是由於此時尚有10<sup>5</sup>歐姆的開關電阻的緣故。 Abstract 　　The photoconductive switch investigated has a dimension of 50μm×50μm and an interdigital finger with 4μm metal and 4μm InP semiconductor. It is characterized by a dark resistance>>10 MΩ and a switch capacitance of 30 fF Under 200-ps optical pulses of 18 mW peak power and 100 MHz repetition frequency, the switch has an average on-resistance of 3 KΩ over 2 ns and off- resistance of 100 KΩ over 8 ns due to laser spontaneous emission. Sample-and-hold of 1 volt amplitude and 10 MHz sinusoidal signal at l00 Msamples/sec is performed by activating the switch with 200-ps optical pulses and by holding the sampled signal over the 2 pF gate capacitance of the FET source follower. The maximum sampled amplitude of 78 mV is due to 3.1 KΩ on-resistance over 2 ns aperture time and the observed feedthrough of 19mV is due to 100 KΩ off-resistance over 8 ns holding time interval.
Relation:	臺北市立師範學院學報 21期 257-264
Appears in Collections:	[Office of Academic Affairs] 臺北市立師範學院學報 (19-36卷1期)

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