单电源供电回路中获得正负电源的特殊方法
热7已有 8635 次阅读 2011-08-30 21:36
图1所示极性变换电路的核心器件为普通的非门。由于输入端与输出端被短接在一起,故非门的输出电压与输入电压相等(Vi=VO);这样,非门被强制工作在转移特性曲线的中心点处,因此输出电压被限定为门电路的阈值电平,其大小等于电源电压的一半,如果我们将非门的输出端作为直流接地端,就可以把电源电压 VCC转换为±VCC/2的双电源电压;此时的非门起到了一个存储电流的稳压器的作用,电路的输出阻抗较低、因而输出电压也比较稳定。 图2所示电路中的运放同相输入端接有对称的串联电阻分压器,而运放本身接为电压跟随器的形式;根据运放线性工作的特点不难看出:运放输出端与分压点间的电位严格相等。由于运放的输出端作接地处理,因此运放的供电电源VCC就被相应地分隔成了两组对称的正、负电源±VCC/2。 对于大多数的OTL功放类器件而言,其内部一般都设置了对称的偏置电路结构,这就使其输出端的直流电位近似为电源电压的一半;根据上述原理,我们完全可以利用集成功放将单电源转换成为大小相等的双极性正、负电源,具体电路如图3所示。 |
发表评论 评论 (11 个评论)
分享网络营销策略技巧
<strong><a href="http://www.uggbootsupdate.com/all-ugg-c-89.html">ugg boots sale</a></strong><br>
<strong><a href="http://www.uggbootsupdate.com/all-ugg-c-89.html">ugg boots clearance</a></strong><br>
<strong><a href="http://www.uggbootsupdate.com/all-ugg-c-89.html">ugg sale</a></strong><br>
<strong><a href="http://www.uggbootsupdate.com/all-ugg-c-89.html">ugg outlet</a></strong><br>
.Make sure acquire your look at from a trendy dealer so that you can insure that you will be not getting scammed.If just one place the truth is a particular watch for sale is on the web this may perhaps be another sign it is a bump off.<br />
<br />
Luxury brandnames of watches usually are not sold at more than a 50% discount regardless of the.Even probably the most aggressive dealer will likely not give you actually this big on the discount away from the retail fee.If the particular dealer will give you this good on the discount it has the probably a fabulous fake.Luxury brands will also be not marketed at clearance or perhaps end of your season product sales.There is not a need for your retailer to trade their helpful jewelry within such great discounts