TI高精度实验室-压摆率-实验.pdf.pdfTI高精度实验室-压摆率-实验.pdfpdf,TI高精

文件名称: TI高精度实验室-压摆率-实验.pdf.pdf

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详细说明：TI高精度实验室-压摆率-实验.pdfpdf,TI高精度实验室-压摆率-实验.pdf真练习可以在任何 SPICE仿真工县中进行。然而,仿真最方便是在TNAT 中完成。TINA-T是一个可以在T官方网站免费下载的软件。我们在这份PPT 中也给出了TNA的仿真原理图。 ●最后,会在T提供的印刷电路板(PCB)上进行实际测量。如果你能使用标准的实验室设备,你可以使用任何小波器和±15V的电源,进行必要的测量。然而我们强烈推荐使用 National instruments的 irtualBench工具。 VirtualBench 是一个多合一测试设备解决方案,通过USB或WF连接电脑,并提供供电电源,模拟信号发生器和示波器通道,此外,还提供一个5位半的万用表方便髙精度测量。木实验课程中就是使用这套虚拟仪器进行测量的计算压摆率根据数据手册里给的瓜摆率来画出输出电的波形 Vout OPA277 500 Vin In 10V v=125μs 8 500 0.00 100u 50u 000见 T ime(6) TEXAS INSTRUMENTS o First, draw the output voltage waveform of the circuit shown below. Use the slew rate specifications given in the table and the techniques from the slew rate lecture. The answer is provided to allow you to check your work ●首先,根据表中给出的参数,结合在压摆率课程中的所学,画岀这里所示电路的输出电压波形。为方便你检查结果,我们在此给出了答案仿真设置压摆率点击进行瞬态仿真查看的压摆率仿真时间到输入信号方波 sis interactie T80M Tools Help ansient Analy Mode. cH→AH-M SLar display Fautsemabled 2Ao Aoo Locks Erd dIspLay 哪各An的nnd Enable MCU Code debugg ra point ? Select Cetemiatuen Ta想e √ Draw excita tan Dfa global P hour amanin Digtal Step-by step v115 J1 0PA277 t品过 Vout Neae Aran. Ct点N tElmaN V215 vpt square wavE 10kHz frequcncy 04-slew Rate-OPAZLTSC TEXAS NSTRUMENTS o the next step is to run a SPICe simulation analysis for the transient output voltage behavior. This will allow us to see the op amp's output voltage response for a specified input signal, which in this case is a 5Vp, 10kHz square wave o the necessary TiNa-ti simulation schematic is embedded in this slide set simply double-click the icon to open it. To simulate the transient output behavior, click Analysis> Transient. Run the analysis from Ous to 200us ●下一步是进行SPCE的瞬态压摆率仿真。这个仿真可以让我们看到,运放在 5vpk,10kHz方波输入时,输出的电压响应 ●TINA的仿真电路图附在ρot中,双击图标即可打廾。仿真步骤如下:点 Analysis Transient。仿真时间从Ous到200u5。仿真结果压摆率 suite Fie Edit View Process Help 日国N臥2 5.00 500 A-H Full C.00 10000u 150.00u 2000c Time(s TEXAS INSTRUMENTS o You should see a result similar to this Vin is a square wave as expected, but Vout must obey the slew rate limitations of the OpA277. You can see this effect in the rise time from 10% to 90% of the output or-4V to 4V. Use the cursors to measure the time required to slew from -4v to 4V, and use the equation that slew rate delta y over delta x to calculate the simulated slew rate of o7V/us ●通过仿真,你应该会得到一个类似这样的结果。输入是方波,如我们所预期的,可以观察到输出被opA277的压拱率给限制了。通过观察输出电压从 10%上升到90%的时问,或者说是从-4V到4V的上升时问可以看到。使用光标来测量从-4V到4的时问,并使用压摆率的计算公式,电压差除以时间, 这个仿真结果的压摆率是07v/us 关闭直流电源 DC POWER SLPPLY V00.000 V15.000 V-15.000 A01.000 A00.100 A0.100 ②7 NSTRUMENTS VirtualBench ⊙目⊙⊙ DIG TAL / O DC POWER SUPPLY DIGITAL MULT METER 46v+20V 3.301 TEXAS INSTRUMENTS o Make sure to disable the dc power supply before setting up the test PCB! In the VirtualBench software, click the power button in the dc power Supply area to turn off the power Check the front panel of the virtualbench unit to make sure the lEds are oFf! also make sure that the function generator is OFF ●在设置PCB前,请确保关闭直流电源。在软件中,点击直流电源区的电源键来关闭电源。可以通过观察前面板的LED来确认电源是否关闭。另外请确保函数发生器也是关闭的。测试板设置跳针 Vout2 JMP18 Uin VautlI 回 PA277 Circuit 5 TEXAS INSTRUMENTS o To prepare the test board for the measurement, install the jumpers and devices on circuit 5 as shown here o Install JMP17, JMP18, and JMP20, as well as the OPA277 in socket U7 ●为了准各测试用的测试板,按图所示安装电路5的跳针和器件。 ●装上JMP17,MP18,MP20并在U7上装上OPA277 测试板原理图电路 JMP13 SND output JMP20 JMP17 GND GND ●● ●● 工 rcut§」 TEXAS INSTRUMENTS o This slide shows the full schematic for Circuit 5 on the ti precision labs test board. You will use this circuit to measure the effect of slew rate limitations on the opa277 ●这页展示的是德州仪器高精度实验室测试板上电路5的原理图。你可以使用这个电路来测试OPA277的压摆率测试板设置画a TEXAS INSTRUMENTS o For the test board to function properly, it is important that you only install jumpers and devices in circuit 5. Do not install any jumpers or devices in any other circuits on the PCB! Remove any jumpers or devices from the unused circuits and store them in the storage area at the bottom of the test board ●为了让测试板正常工作,你只可以安装电路5的跳针和器件。不能安装PCB 上其他电路里面的珧针和元件。去抻不相关电路上的跳针和器件,并把亡们放在板子底部的存放区。

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