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把三角波转换成正弦波的宽带正弦波转换器
来源：本站整理 作者：佚名 2010-05-19 09:10:39
把三角波转换成正弦波的宽带正弦波转换器
作者：佚名 来源：本站整理 发布时间：2010-5-6 14:30:53 [收 藏] [评 论]
abs</a>olute; TOP: 0px" name="google_ads_frame" marginwidth="0" marginheight="0" src="http://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-7913339004558941&output=html&h=60&slotname=4476699554&w=468&lmt=1273127501&flash=10.0.45.2&url=http%3A%2F%2Fwww.elecfans.com%2Farticle%2Fanalog%2F2010%2F20100506217138.html&dt=1274113334781&shv=r20100505&correlator=1274113334812&frm=0&ga_vid=681374967.1274113335&ga_sid=1274113335&ga_hid=842451241&ga_fc=0&u_tz=480&u_his=0&u_java=1&u_h=800&u_w=1280&u_ah=770&u_aw=1280&u_cd=32&u_nplug=0&u_nmime=0&biw=749&bih=546&eid=33895100&ref=http%3A%2F%2Fwww.elecfans.com%2Farticle%2Fspecial%2FArticle_New014.html&fu=0&ifi=1&dtd=94&xpc=KkC385lN6P&p=http%3A//www.elecfans.com" frameborder="0" width="468" <a target="_blank" href="http://www.gzweix.com/article/sort0253/sort0550/info-302488.html" class="UBBWordLink">scr</a>olling="no" height="60" allowtransparency="true"/></ins></ins></div><h6>把三角波转换成正弦波的宽带正弦波转换器</h6><p><b>电路的功能</b></p><p><img height="273" src="/article/UploadPic/2010-5/201051991039881.jpg" width="450" border="0" onload="return imgresize(this);" style="cursor:pointer;" onclick="javascript:window.open(this.src);"/></p><p>正弦波转换器的作用是把三角波变成正弦波，它是一种近似折线的电路，可广泛用于正弦函数发生器，一提到正弦波转换，人们往往会想到用滤波器滤掉高频的办法，本电路不是依靠输入频率，而可在超低频~数兆赫的频率范围内工作。</p><p><b>电路工作原理</b></p><p><img src="/article/UploadPic/2010-5/201051991040646.jpg" border="0" onload="return imgresize(this);" style="cursor:pointer;" onclick="javascript:window.open(this.src);"/></p><p>为了便于理解，用输入信号的正半周来加以说明。如图A所示，二极管D1在0V~E1之间不导通，所以电路输出按线性上升，输入信号加大，D1、D2......相继导通，输出线逐渐下斜，接近正弦型。为了减少高次谐波，可用增加折点的办法解决。但E1~E0的的电压分配越接近正弦90度处，电压差越小，转换效果变差。为了克服这个明显的不是，使电路能够实用，可对二极管D1~D5进行正向电压补偿，使实际折点的电压为偏压与正向电压之和，正向电压因温度上升而下降，如果让偏压以同样比例升高，即可得到补偿。</p><p>本电路的TT1~TT4是使加在D6、D12上的电压随温度而变得电源电路，TT3、TT4可作为检测环境的传感器使用。用VR1、VR2对正、负电压进行调节，为了使失真小，应进行互调整，使高次谐波总失真在0.2%~0.5%以内。</p><p>TT5和TT6是推挽缓冲放大器，负载阻抗为1K。若要驱动50欧负载，应增加放大倍数为4倍的宽带放大器。</p><p><b>使用注意事项</b></p><p>本电路使用正负15V的稳压电源，如果输入不在8VP-P以下，输入的三角波就不能转换成失真小的正弦波，应予注意。此外，为加宽频带采用了低阻抗，所以作为信号源的三角波发生器也应使用低输出阻抗的电路。</p><p><img height="270" src="/article/UploadPic/2010-5/201051991041236.jpg" width="540" border="0" onload="return imgresize(this);" style="cursor:pointer;" onclick="javascript:window.open(this.src);"/></p></div></td></tr></table></td></tr></table></div><div style="clear:both"></div> <div class="textTags8"><h2>关键词：</h2></div> <div align="center" style='margin:10px auto'><script 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