过零比较和锁相环相位比较器电路原理图如图.pdf

过零比较和锁相环相位比较器电路原理图如图

过零比较和锁相环相位比较器电路原理图如图

现在常使用集成电路的锁相环CD4046，是通用的CMOS锁相环集成电路，其特

点是电源电压范围宽(为3V,18V)，输入阻抗高(约100MΩ)，动态功耗小，在中心

频率f0为10kHz下功耗仅为600μW，属微功耗器件。下图是CD4046的

引脚排列，采用16脚双列直插式，各引脚功能如图2.12所示。

1脚相位输出端，环路入锁时为高电平，环路失锁时为低电平。2脚相位比较

器?的输出端。3脚比较信号输入端。13脚相位比较器?的输出端。14脚信号输入

端。对相位比较器?而言，当14脚的输入信号比3脚的比较信号频率低时，输出为

逻辑“0”;反之则输出逻辑“1”。如果两信号的频率相同而相位不同，当输人信

号的相位滞后于比较信号时，相位比较器?输出的为正脉冲，当相位超前时则输出

为负脉冲。在这两种情况下，从1脚都有与上述正、负脉冲宽度clearly,for

maintenancemanagement.4.install(1)allsortsofswitches,sockets

andotherequipmentshouldbeinstalledfirmly,positionaccurate,when

installingrockerpanel,switches,switchshouldbeconsistent,

generallyuptoclosedowntooffswitchshouldcutofftheline.

Switchestheelevationandlocationofthesocketshouldconformtothe

drawings,thesameinteriorheightdifferenceshouldnotbegreaterthan

5mm.(2)liquidlevelautomaticcontroldeviceusedinavarietyof

anglebrackets,thereshouldbegalvanized.(3)fixedlamphangingboxes

areplasticwithrotarytableroundtable.(4)lightbulbcapacityof

100Worless,availableresinlamp,100Wandthetidesealedlamps,

porcelainlamps.(5)thewiringinsidethelampshallnotbelessthan

0.4mm2wires.(6)thechandelierwithaweightofmorethan3kg,the

embeddedhook-bolts,installlightinginthebrickorconcrete

structures,shoulduseexpansionboltsorplastictube,bantheuseof

woodenwedgesinstead.(7)theceilingmountedlightfixtures,borderof

theshadeshouldcoverPaneljointsandsnappedtheceilingpanel,

determinethesizelampopenposition,strictlyaccordingtothe

drawings.(8)thelampsarrangedorderly,symmetricalwheninstalling

theverticalandhorizontalcenterlinesshouldbeonthesameline,

deviationislessthan5mm.(9)theemergencylightinginstallation:

accordingtothedesignandspecificationstodeterminelocationof

evacuationlighting,signsshould

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