📄 21ic 基于th71101的fsk-ask数字接收电路设计.htm
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<TD align=middle height=31><FONT size=4><B>基于TH71101的FSK/ASK数字接收电路设计
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<TD align=middle height=15>文章作者：南华大学 唐 冬 黄智伟 衡阳市公路管理局
吕明霞<BR>文章类型：设计应用 文章加入时间：2004年2月2日15:3</TD></TR>
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<TD align=right><FONT color=#cc0000>文章出处：单片机及嵌入式系统应用</FONT> </TD></TR>
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<B>摘要：</B></SPAN>TH71101是一个单片射频接收器芯片，工作在300～450MHz
ISM频段；片内包含低噪声放大器、双混频器、压控振荡器、PLL合成器、晶体振荡器等电路，能接收模拟和数字FSK/FM/ASK信号。文中给出了TH71101的结构、原理、特性及应用电路。</P>
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<B>关键词：</B></SPAN>无线接收 FSK ASK 频率合成器 TH71101</P>
<P style="TEXT-INDENT: 0px"><B>1 概述</B></P>
<P style="TEXT-INDENT: 30px">TH71101是双超外差式结构的无线电接收芯片，工作在300～450MHz
ISM频段，能与TH7107等芯片配套，实现ISM频段无线模拟和数字信号传输；内部包含一个低噪声放大器、双混频器、压控振荡器、PLL合成器、晶体振荡器等电路。能接收模拟和数字FSK/FM/ASK信号。FSK数据速率可达40kb/s，ASK数据速率达80kb/s，FM带宽15kHz；灵敏度111dBm。电源电压2.5～5.5V,工作电流8.2mA，待机电流<100nA。适用于ISM（工业、科学和医学）频率范围内的各种应用，如数据通信系统、无钥匙进入系统、遥控遥测系统、安防系统等。<B><BR><IMG
height=870 src="21IC 基于TH71101的FSK-ASK数字接收电路设计.files/12a.gif"
width=560 border=0><BR>2 芯片封装与引脚功能</B></P>
<P
style="TEXT-INDENT: 30px">TH71101采用LQFP32封装，各引脚功能如表1所列。<BR><BR><B>表1
TH71101引脚功能</B></P>
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<TR class=main>
<TD align=middle width="17%" height=12>引脚号</TD>
<TD align=middle width="22%" height=12>符 号</TD>
<TD width="61%" height=12>
<P align=center>功
能</P></TD></TR>
<TR class=main>
<TD align=middle width="17%" height=9>1</TD>
<TD align=middle width="22%" height=9>VEE</TD>
<TD width="61%" height=9>地</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>2</TD>
<TD align=middle width="22%" height=12>GAIN-LNA</TD>
<TD width="61%" height=12>低噪声放大器（LNA）增益控制</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>3</TD>
<TD align=middle width="22%" height=12>OUT-LNA</TD>
<TD width="61%" height=12>LNA输出，连接到外接的LC调谐回路</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>4</TD>
<TD align=middle width="22%" height=12>IN-MIX1</TD>
<TD width="61%" height=12>混频器1（MIX1）输入，单端阻抗约33Ω</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>5</TD>
<TD align=middle width="22%" height=12>VEE</TD>
<TD width="61%" height=12>地</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>6</TD>
<TD align=middle width="22%" height=12>IF1P</TD>
<TD width="61%" height=12>中频1（IF1）集电极开路输出</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>7</TD>
<TD align=middle width="22%" height=12>IF1N</TD>
<TD width="61%" height=12>中频1（IF1）集电极开路输出</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>8</TD>
<TD align=middle width="22%" height=12>VCC</TD>
<TD width="61%" height=12>电源输入</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>9</TD>
<TD align=middle width="22%" height=12>OUT-MIX2</TD>
<TD width="61%" height=12>混频器2（MIX2）输出，输出阻抗约330Ω</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>10</TD>
<TD align=middle width="22%" height=12>VEE</TD>
<TD width="61%" height=12>地</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>11</TD>
<TD align=middle width="22%" height=12>IFA</TD>
<TD width="61%" height=12>中频放大器（IFA）输入，输入阻抗约2.2kΩ</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>12</TD>
<TD align=middle width="22%" height=12>FBC1</TD>
<TD width="61%" height=12>连接外接的中频放大器反馈电容</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>13</TD>
<TD align=middle width="22%" height=12>FBC2</TD>
<TD width="61%" height=12>连接外接的中频放大器反馈电容</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>14</TD>
<TD align=middle width="22%" height=12>VCC</TD>
<TD width="61%" height=12>电源输入</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>15</TD>
<TD align=middle width="22%" height=12>OUT-IFA</TD>
<TD width="61%" height=12>中频放大器输出</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>16</TD>
<TD align=middle width="22%" height=12>IN-DEM</TD>
<TD width="61%" height=12>解调器（DEMOD）输入</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>17</TD>
<TD align=middle width="22%" height=12>VCC</TD>
<TD width="61%" height=12>电源输入</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>18</TD>
<TD align=middle width="22%" height=12>OUT-OA</TD>
<TD width="61%" height=12>运算放大器（OA）输出</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>19</TD>
<TD align=middle width="22%" height=12>OAN</TD>
<TD width="61%" height=12>运算放大器（OA）负极输入</TD></TR>
<TR class=main>
<TD align=middle width="17%" height=12>20</TD>
<TD align=middle width="22%" height=12>OAP</TD>
<TD width="61%" height=12>运算放大器（OA）正极输入</TD></TR>
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