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   "source": [
    "## 根据表4-4数据，画出无反馈和有反馈放大电路的幅频特性曲线（Y轴放大倍数Au，X轴频率f）"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "import numpy as np\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "# 设置matplotlib库的字体为SimHei，以支持中文显示\n",
    "plt.rcParams[\"font.sans-serif\"] = [\"SimHei\"]\n",
    "plt.rcParams[\"axes.unicode_minus\"] = False\n",
    "\n",
    "# 无反馈放大电路的数据\n",
    "no_feedback_data = {\n",
    "    \"f\": [300, 545, 1000, 2000, 4000, 9170, 15000],\n",
    "    \"Au\": [44.057, 84.719, 121.17, 121.172, 121.17, 84.239, 62.681],\n",
    "}\n",
    "\n",
    "# 有反馈放大电路的数据\n",
    "feedback_data = {\n",
    "    \"f\": [200, 301, 500, 3200, 10000, 23600, 40000],\n",
    "    \"Au\": [17.151, 32.831, 46.283, 46.283, 46.283, 32.698, 23.456],\n",
    "}\n",
    "\n",
    "# 创建数据框\n",
    "df_no_feedback = pd.DataFrame(no_feedback_data)\n",
    "df_feedback = pd.DataFrame(feedback_data)\n",
    "\n",
    "# 绘制幅频特性曲线\n",
    "plt.figure(figsize=(10, 6))\n",
    "plt.semilogx(df_no_feedback[\"f\"], df_no_feedback[\"Au\"], label=\"无反馈\")\n",
    "plt.semilogx(df_feedback[\"f\"], df_feedback[\"Au\"], label=\"有反馈\")\n",
    "plt.title(\"放大电路的幅频特性曲线\")\n",
    "plt.xlabel(\"频率 (f)\")\n",
    "plt.ylabel(\"放大倍数 (Au)\")\n",
    "plt.legend()\n",
    "plt.grid(True)\n",
    "plt.show()"
   ]
  }
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