小信号SOT23封装的肖特基二极管BAT54s

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01 SOT23肖特基二极管

• BAT54，BAT54A，BAT54C，BAT54S 数据手册

一、前言

  这是一颗SOT23封装的小信号肖特基二极管，为了后面利用它完成 20kHz 电磁信号检波， 现在初步对它进行测量， 所获得数据为之后的应用打下基础。

二、静态测量

三、倍压整流

  利用BAT54S与外部两个电容C1,C2 和电阻R1组成倍压检波电路。 信号U1由数控信号发生器 DG1062产生，  通过C1， 耦合到双肖特基二极管， 检波后的信号经过C2滤波， 通过U2 输出。

  在面包板上搭建测试电路， 输入信号为20kHz 正弦波， 信号峰峰幅值通过 Python 编程控制从 0V 逐步增加到 2V， 利用数字万用表测量检波输出电压信号。 这是测量数据， 横坐标为输入信号的峰峰值， 纵坐标是检波输出信号。 在输入电压小于 0.25V之前，存在一个检波死区。 这个死区影响了小信号的检波结果。

idim=[0.00,0.02,0.04,0.06,0.08,0.10,0.12,0.14,0.16,0.18,0.20,0.22,0.24,0.26,0.28,0.30,0.32,0.34,0.36,0.38,0.40,0.42,0.44,0.46,0.48,0.51,0.53,0.55,0.57,0.59,0.61,0.63,0.65,0.67,0.69,0.71,0.73,0.75,0.77,0.79,0.81,0.83,0.85,0.87,0.89,0.91,0.93,0.95,0.97,0.99,1.01,1.03,1.05,1.07,1.09,1.11,1.13,1.15,1.17,1.19,1.21,1.23,1.25,1.27,1.29,1.31,1.33,1.35,1.37,1.39,1.41,1.43,1.45,1.47,1.49,1.52,1.54,1.56,1.58,1.60,1.62,1.64,1.66,1.68,1.70,1.72,1.74,1.76,1.78,1.80,1.82,1.84,1.86,1.88,1.90,1.92,1.94,1.96,1.98,2.00]
vdim=[0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.01,0.01,0.01,0.02,0.02,0.03,0.03,0.04,0.05,0.06,0.07,0.08,0.09,0.10,0.12,0.13,0.14,0.16,0.17,0.18,0.20,0.21,0.23,0.24,0.26,0.27,0.29,0.30,0.32,0.33,0.35,0.36,0.38,0.40,0.41,0.43,0.44,0.46,0.48,0.49,0.51,0.53,0.54,0.56,0.57,0.59,0.61,0.62,0.64,0.66,0.67,0.69,0.71,0.72,0.74,0.76,0.77,0.79,0.81,0.83,0.84,0.86,0.88,0.89,0.91,0.93,0.94,0.96,0.98,1.00,1.01,1.03,1.05,1.06,1.08,1.10,1.11,1.13,1.15,1.17,1.18,1.20,1.22,1.23,1.25,1.27,1.29,1.30,1.32,1.34]

1、测试程序

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST1.PY -- by Dr. ZhuoQing 2023-02-12
#
# Note:
#============================================================

from headm import *
from tsmodule.tsvisa        import *

dm3068open()

printf(dm3068vac())

#------------------------------------------------------------
dg1062open(114)
dg1062freq(1, 20000)

time.sleep(1)

vdim = []
#fdim = logspace(3, 6, 100, endpoint=True)
idim = linspace(0, 2, 100, endpoint=True)

for i in idim:
    dg1062volt(1, i)
    time.sleep(1)

    v = dm3068vdc()
    vdim.append(v)

    printff(i, v)
    tspsave('rectv', idim=idim, vdim=vdim)


plt.plot(idim, vdim)

plt.xlabel("Input_Voltage(V)")
plt.ylabel("Voltage(V)")
plt.grid(True)
plt.tight_layout()
plt.show()

#------------------------------------------------------------
printf('\a')

#------------------------------------------------------------
# END OF FILE : TEST1.PY
#============================================================

※ 总  结 ※

  本文测试了SOT23封装的肖特基二极管 BAT54的基本特性， 利用它可以很方便搭建倍压检波电路，  以及其他需要对输入端口进行钳位保护的场合。

■ 相关文献链接:

• BAT54，BAT54A，BAT54C，BAT54S 数据手册
• 串联二极管，提高耐压

● 相关图表链接:

• 图1.2.1 利用数字万用表测量得到BAT54s 各个管脚之间的电压
• 图1.2.2 利用绝缘表测量各个管脚反向击穿电压