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对外贸网站建设的建议,wordpress rockgroup,做网站空间会招攻击,网站制作教程百度云压控增益变化运放AD603测试AD603AR的基本特性Low Noise 90MHz Variabel Gain Amplifier 01 AD603AR的控制特性 一、测试背景 昨天测试了增益可编程运放 AD603AR#xff0c;  由于铺设PCB的引线问题#xff0c; 电路在测量过程中出现了过多的干扰。  下面重新对电路PCB铺设进…压控增益变化运放AD603测试AD603AR的基本特性Low Noise 90MHz Variabel Gain Amplifier01AD603AR的控制特性一、测试背景昨天测试了增益可编程运放 AD603AR 由于铺设PCB的引线问题 电路在测量过程中出现了过多的干扰。 下面重新对电路PCB铺设进行优化 输入输出信号都使用屏蔽线进行测量。 测量一下运放增益变化的特性。二、测试电路修改设计的电路。 核心放大芯片为ADF603AR。 增益控制负向输入被偏置到 2.5V 。 正向输入有外部的直流电源提供。 通过一个 4 芯 端口连接外部的信号源与示波器。 铺设单面PCB 制作测试电路板。三、测试结果焊接电路 清洗之后进行测试。 首先将 AD603 的输出反馈切断 这样可以提高最高的放大倍数 最大可以达到 40dB。 输入峰峰值 0.1V 正弦波 经过放大 输出信号的峰峰值达到了 2V。 放大倍数为 20倍 对应 26dB。增益控制正向电压从 1.5V 变化到 3.5V, 测量输出交流信号有效值。 可以看到输出信号的增益变化了大约 12倍左右. 这个变化范围似乎与数据手册对应的不一样. 猜测是 因为增益控制负向设置为 2.5V 是否太大了? 也许,降低负向输入偏置电压可以提高增益放大控制范围.▲ 图1.3.1 增益正向输入电压与输出信号幅度#!/usr/local/bin/python# -*- coding: gbk -*-## TEST1.PY -- by Dr. ZhuoQing 2025-12-11## Note:#fromheadmimport*fromtsmodule.tsvisaimport*dm3068open()vsetlinspace(1.5,3.5,100)vout[]forvinvset:dh1766volt(v)time.sleep(1.5)acdm3068vac()vout.append(ac)printff(v,ac)tspsave(measure,vsetvset,voutvout)plt.plot(vset,vout,lw3)plt.xlabel(Vset(V),colorsteelblue,fontsize24)plt.ylabel(Vout(V),colorsteelblue,fontsize24)plt.grid(True,whichboth,linestyle--,alpha0.7)plt.tight_layout()plt.show()#------------------------------------------------------------printf(\a)#------------------------------------------------------------# END OF FILE : TEST1.PY#vset[1.5000,1.5202,1.5404,1.5606,1.5808,1.6010,1.6212,1.6414,1.6616,1.6818,1.7020,1.7222,1.7424,1.7626,1.7828,1.8030,1.8232,1.8434,1.8636,1.8838,1.9040,1.9242,1.9444,1.9646,1.9848,2.0051,2.0253,2.0455,2.0657,2.0859,2.1061,2.1263,2.1465,2.1667,2.1869,2.2071,2.2273,2.2475,2.2677,2.2879,2.3081,2.3283,2.3485,2.3687,2.3889,2.4091,2.4293,2.4495,2.4697,2.4899,2.5101,2.5303,2.5505,2.5707,2.5909,2.6111,2.6313,2.6515,2.6717,2.6919,2.7121,2.7323,2.7525,2.7727,2.7929,2.8131,2.8333,2.8535,2.8737,2.8939,2.9141,2.9343,2.9545,2.9747,2.9949,3.0152,3.0354,3.0556,3.0758,3.0960,3.1162,3.1364,3.1566,3.1768,3.1970,3.2172,3.2374,3.2576,3.2778,3.2980,3.3182,3.3384,3.3586,3.3788,3.3990,3.4192,3.4394,3.4596,3.4798,3.5000]vout[0.0714,0.0714,0.0714,0.0714,0.0715,0.0715,0.0715,0.0715,0.0716,0.0717,0.0719,0.0722,0.0726,0.0731,0.0739,0.0748,0.0759,0.0774,0.0792,0.0814,0.0840,0.0870,0.0905,0.0943,0.0985,0.1031,0.1079,0.1128,0.1178,0.1229,0.1279,0.1330,0.1383,0.1437,0.1497,0.1566,0.1653,0.1767,0.1936,0.2191,0.2578,0.3177,0.4555,0.6581,0.7869,0.8122,0.8248,0.8315,0.8357,0.8383,0.8399,0.8411,0.8417,0.8422,0.8426,0.8429,0.8430,0.8431,0.8433,0.8435,0.8435,0.8435,0.8434,0.8435,0.8435,0.8435,0.8434,0.8434,0.8435,0.8435,0.8434,0.8433,0.8433,0.8434,0.8433,0.8434,0.8433,0.8433,0.8433,0.8432,0.8433,0.8433,0.8433,0.8434,0.8433,0.8433,0.8434,0.8433,0.8434,0.8433,0.8434,0.8433,0.8434,0.8434,0.8433,0.8433,0.8433,0.8433,0.8432,0.8433]降低增益控制负输入端电压 将电路中的 R2 修改为 2k欧姆。 对应的负向输入电压为 1V。 测量输出信号随着增益控制正向输入电压的变化。 此时 输入信号为 峰峰值 10mV 的 1kHz 的正弦信号。 在增益控制电压小于 0.5V 之前 输出交流信号幅度大约为 有效值 7mV。 当正向电压超过 1.5V之后 输出信号的有效值达到了 0.794V。 的确 增益超过了 40dB。 在这个过程中 输出信号的幅度出现了一个突变 这有可能是因为此时 电路出现了高频震荡引起的。▲ 图1.3.2 GNEG设置为 1V 对应的正向控制电压与输出电压vset[0.0000,0.0202,0.0404,0.0606,0.0808,0.1010,0.1212,0.1414,0.1616,0.1818,0.2020,0.2222,0.2424,0.2626,0.2828,0.3030,0.3232,0.3434,0.3636,0.3838,0.4040,0.4242,0.4444,0.4646,0.4848,0.5051,0.5253,0.5455,0.5657,0.5859,0.6061,0.6263,0.6465,0.6667,0.6869,0.7071,0.7273,0.7475,0.7677,0.7879,0.8081,0.8283,0.8485,0.8687,0.8889,0.9091,0.9293,0.9495,0.9697,0.9899,1.0101,1.0303,1.0505,1.0707,1.0909,1.1111,1.1313,1.1515,1.1717,1.1919,1.2121,1.2323,1.2525,1.2727,1.2929,1.3131,1.3333,1.3535,1.3737,1.3939,1.4141,1.4343,1.4545,1.4747,1.4949,1.5152,1.5354,1.5556,1.5758,1.5960,1.6162,1.6364,1.6566,1.6768,1.6970,1.7172,1.7374,1.7576,1.7778,1.7980,1.8182,1.8384,1.8586,1.8788,1.8990,1.9192,1.9394,1.9596,1.9798,2.0000]vout[0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0073,0.0074,0.0077,0.0081,0.0087,0.0095,0.0105,0.0115,0.0125,0.0136,0.0147,0.0160,0.0176,0.0195,0.0217,0.0240,0.0262,0.0284,0.0308,0.0336,0.0372,0.0415,0.0460,0.0505,0.0550,0.0595,0.0648,0.0714,0.0792,0.0881,0.0972,0.1061,0.1149,0.1247,0.1366,0.1511,0.1683,0.1863,0.2043,0.2312,0.2513,0.2745,0.3025,0.3350,0.3698,0.4047,0.4369,0.4682,0.5023,0.5009,0.4983,0.5577,0.6775,0.7184,0.7452,0.7641,0.7761,0.7822,0.7847,0.7866,0.7889,0.7891,0.7913,0.7909,0.7908,0.7906,0.7893,0.7905,0.7921,0.7915,0.7912,0.7929,0.7923,0.7930,0.7935,0.7936,0.7939,0.7945]将输出反馈回路短接。 此时运放的最大增益为 30dB左右。 测量增益控制电压与输出信号幅度的关系。 当增益正向输入电压小于 0.5V 输出信号幅度大约为 3.5mV 左右。 当增益正向输入电压超过 1.5V 对应输出信号电压为 0.28V。 增益电压超过 1.5V之后 运放也处在高频震荡状态。▲ 图1.3.3 短接输出返回回路之后增益控制与输出信号幅度vset[0.0000,0.0202,0.0404,0.0606,0.0808,0.1010,0.1212,0.1414,0.1616,0.1818,0.2020,0.2222,0.2424,0.2626,0.2828,0.3030,0.3232,0.3434,0.3636,0.3838,0.4040,0.4242,0.4444,0.4646,0.4848,0.5051,0.5253,0.5455,0.5657,0.5859,0.6061,0.6263,0.6465,0.6667,0.6869,0.7071,0.7273,0.7475,0.7677,0.7879,0.8081,0.8283,0.8485,0.8687,0.8889,0.9091,0.9293,0.9495,0.9697,0.9899,1.0101,1.0303,1.0505,1.0707,1.0909,1.1111,1.1313,1.1515,1.1717,1.1919,1.2121,1.2323,1.2525,1.2727,1.2929,1.3131,1.3333,1.3535,1.3737,1.3939,1.4141,1.4343,1.4545,1.4747,1.4949,1.5152,1.5354,1.5556,1.5758,1.5960,1.6162,1.6364,1.6566,1.6768,1.6970,1.7172,1.7374,1.7576,1.7778,1.7980,1.8182,1.8384,1.8586,1.8788,1.8990,1.9192,1.9394,1.9596,1.9798,2.0000]vout[0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0035,0.0036,0.0036,0.0037,0.0039,0.0042,0.0045,0.0050,0.0055,0.0060,0.0065,0.0070,0.0077,0.0084,0.0093,0.0103,0.0114,0.0124,0.0135,0.0146,0.0160,0.0176,0.0196,0.0217,0.0239,0.0261,0.0283,0.0308,0.0340,0.0377,0.0419,0.0464,0.0507,0.0550,0.0597,0.0655,0.0725,0.0806,0.0893,0.0980,0.1065,0.1154,0.1257,0.1382,0.1529,0.1691,0.1856,0.2015,0.2165,0.2287,0.2384,0.2493,0.2617,0.2744,0.2861,0.2969,0.3065,0.3159,0.3264,0.3447,0.3753,0.3884,0.3965,0.4143,0.4204,0.4218,0.4225,0.4232,0.4236,0.4239,0.4240,0.4244,0.4247,0.4247,0.4249,0.4249,0.4249,0.4250,0.4249]※总结 ※本文测试了压控增益运放 AD603的基本特性。 由于使用了单面PCB 虽然进行了布线优化 但在增益超过 30dB之后 运放还是出现震荡。 增益控制负向输入电压在 1V 的时候 增益控制特性符合数据手册给出的规律。 但是如果增益控制负向输入电压在 2.5V 增益控制特性就会被大大压缩了。■ 相关文献链接:测试AD603AR的基本特性-CSDN博客Low Noise 90MHz Variabel Gain Amplifier● 相关图表链接:图1.3.1 增益正向输入电压与输出信号幅度图1.3.2 GNEG设置为 1V 对应的正向控制电压与输出电压图1.3.3 短接输出返回回路之后增益控制与输出信号幅度