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使用0-1 Vpp,60 Hz单脉冲斜坡来驱动2N2222晶体管的集电极。
开路时,斜坡输出完全符合预期。 连接后,FG输出电流在约8 ms内从0增加到5 mA,然后关闭。 在转换期间,FG输出电压无法保持所需的斜坡斜率(见图)。 一旦1/60秒周期结束,突发结束时输出电压远低于1 Vpp设定点。 从转换速率规格来看,我不希望FG对此有任何问题。 是否有一些特殊的爆发输出导致问题,如果有,有什么可以做的吗? 以上来自于谷歌翻译 以下为原文 Using 0-1 Vpp, 60 Hz single burst ramp to drive the collector of a 2N2222 transistor. When open circuit, the ramp output is exactly as expected. When connected, the FG output current ramps up from 0 to 5 mA over about 8 ms and then levels off. During the transition, the FG output voltage is not able to maintain the needed ramp slope (see figure). Once the 1/60 second period is over, the burst ends with the output voltage well short of the 1 Vpp set point. From slew rate specs I wouldn't expect the FG to have any problem with this. Is there something special about burst output that is causing the problem, and if so, is there anything that can be done? 附件
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2个回答
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没有真正挖掘,我的第一个猜测是阻抗问题。
不同状态下晶体管的阻抗是多少? 33120A设计为50欧姆。 如果DUT的阻抗不同,则输出可能会缩放到意外值。 以上来自于谷歌翻译 以下为原文 Without really digging in, my first guess would be an impedance issue. What is the impedance of the transistor in the different states? The 33120A is designed for 50 ohms. If the impedance of the DUT is something different, the output could be scaled to an unexpected value. |
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你是对的。
当您查看IV曲线的斜率进出饱和度时,晶体管有两个非常不同的有效电阻。 当晶体管具有低饱和电阻时,由50欧姆信号发生器内部电阻和晶体管集电极 - 发射极端子组成的分压器测量的输出电压降至33120电压设定点以下,并且当电阻在前向电阻增加时恢复 活跃地区。 应该想到这一点。 以上来自于谷歌翻译 以下为原文 Yes, you're right. The transistor has two very different effective resistances when you look at the slopes of the IV curves in and out of saturation. Output voltage measured from the voltage divider made up of the 50 ohm signal generator internal resistance and the transistor collector-emitter terminals drops below the 33120 voltage set point when the transistor has its low resistance in saturation and recovers when the resistance increases in the forward-active region. Should have thought of that. |
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