【正文】 s two laws, doing practical play highway. 2020 October 18, the Central Committee of the Communist Party of China promulgated the implementation of the the probity of the Communist Party of China selfdiscipline criterion and Chinese Communist Party discipline and punishment regulations. We Heyuan male passersby to respond positively to the call of the Central Committee of the party, earnestly anize the study party two regulations, truly grasp the essence and gist, and in their respective positions, to hold the bottom line of the discipline, build a strong ideological line of defense, with the courage to play, the courage to fight tough and fearless spirit, at the crucial moment well to plete the task, with practical action to test the study and implement effect Because of discipline in the * * * * * * * * * * * story. Here, let me to cast a brick to attract jade, speak about our highway. Highway line section of the road surface transformation project, last year towards the country 多功能信號發(fā)生器 25 seized will be seized one of the items. To plete this arduous task, as a project management office director Comrade, keep in mind from the Communist Party membership, recognize and identify the bottom line, strict management, and strict adherence to the quality of the project. He not only set an example, honesty and selfdiscipline, but also requires the management of all the members of the ., do not eat the construction unit one meal, do not accept the construction unit a ceremony. In this way, they didn39。 difficult to myself to move away the heart of stone head. Leave time to spend with her, often reflect my heart, so as to remove your heart of stone. 24, everything does not have to be demanding, e to, everything does not have to care about, over the past。 but the most important is good to cherish their own. 21, life, select the plex, is to choose the pain。 to be alive, you will have trouble. Life is the most afraid of what all want to care about, but also what all grasp is not firm, without scenery, separated populations, such as not to desire, all docked in the fate of the end. Why is too rigid, the natural, to go stay not to live, let go of obsession, revel is 20, if the fate of the broken Hopes of sailing, please don39。t lose your life and the life, respectively is: the former is a we experienced cannot escape in a day finally will last minute, while the latter is our persistent, we want to cherish the memory of those people and things. 14, learn to smile, learn to strong, the world you know so many people, so many people and you are, you cannot change also can39。 no matter how many grievances, how unfortable, and ultimately to heal themselves or their own, others may got you to fort, but never know your heart is how wanjianchuanxin. 12, ma39。 now want anything, for fear that others know, or like to lose the same. 9, the heart move, everything in the world is followed by birth, Rangrang, important thing is often the most difficult to open one39。 life happy and worry, all is you of life attitude, optimistic, good luck。 I am not afraid of the truth to tell the best friend, I39。t always take everything back to things, and don39。 to discipline a ruler, often the control inspection, and consciously in the ideological red line to draw the row Ming Good accumulation is indeed the bottom line, so that the heart has fear, said to have quit, the line has ended. Attached: indifferent to heart, calmly to the table in our life, there are many unpredictable things will happen, some good, some bad things, we cannot control is powerless to stop, but with time, you will find in life sometimes turns out to be not good, some bad things finally turned out to be a good thing, but then we muddy however did not know, this is the life teach us things. 1, life can be plex, can also be simple. Want simple life of precipitation, to have enough time to reflect, to make Bee 多功能信號發(fā)生器 18 more perfect. Life is the most important thing is not to win, but the struggle?？v向 。 其主要流程圖如 圖 37 所示。 FR11 M ΩR220kΩV C C1 2 VV D D12V 圖 36 峰 峰值檢測電路 多功能信號發(fā)生器 10 軟件實(shí)現(xiàn) 系統(tǒng)以單片機(jī)為控制器，采用 C 語言對單片機(jī)進(jìn)行編程。只要 RC 足夠大，可以認(rèn)為其輸出的直流電壓數(shù)值多功能信號發(fā)生器 9 上十分接近于交流電壓的峰值。 交流電源在正半周的一段時(shí)間內(nèi) , 通過二極管對電容充電 ， 使電容上的電壓逐漸趨近于峰值電壓。而這兩個(gè)參考電壓也是可以通過軟件來編程設(shè)置的。 ADC12 模塊中由以下部分組成：輸入的 16 路模擬開關(guān) ,ADC 內(nèi)部電壓參考源， ADC12 內(nèi)核， ADC時(shí)鐘源部分，采集與保持 /觸發(fā)源部分， ADC 數(shù)據(jù)輸出部分， ADC 控制寄存器等組成。如果在兩片導(dǎo)電玻璃通電之后，兩片玻璃間會(huì)造成電場，進(jìn)而影響其間液晶分子的排列，使其分子棒進(jìn)行扭轉(zhuǎn)，光線便無法穿透，進(jìn)而遮住光源。其主要部分是一塊與顯示器表面非常配合的電阻薄膜屏，這是一種多層的復(fù)合薄膜，它以一層玻璃或硬塑料平板作為基層，表面涂有一層透明的金屬氧化物 (ITO)導(dǎo)電層，上面再蓋有一層外表面硬化處理、光滑防劃傷的塑料層 (其內(nèi)表面也涂有一層 ITO 涂層 ),在他們之間有許多細(xì)小的（大約 1/1000 英寸）透明間隔點(diǎn)把兩層 ITO 導(dǎo)電層隔開絕緣。 三路輸出切換用繼電器，使得波形完整輸出。 范圍的一個(gè)相位點(diǎn)。 AD9850 是 AD 公司生產(chǎn)的最高時(shí)鐘為 125 MHz、采用先進(jìn)的 CMOS 技術(shù)的直接頻率合成器，主要由可編程 DDS 系統(tǒng)、高性能 模數(shù)變換器（ DAC）和高速比較器 3 部分構(gòu)成，能實(shí)現(xiàn)全數(shù)字編程控制的頻率合成，并具有時(shí)鐘產(chǎn)生功能。 鑒于本系統(tǒng)的 擴(kuò)展要求，我們采用 LCD 液晶作為我們的顯示模塊。 方案二：采用 LCD 液晶彩屏顯示。 結(jié)合本系統(tǒng)，權(quán)衡兩方案利弊，我們最后決定采用方案一作為輸入控制模塊。 所以 選擇用 AD9850 芯片的直接數(shù)字頻率合成。 圖 22 AD9850 基本結(jié)構(gòu) 多功能信號發(fā)生器 4 綜合比較以上方案，結(jié)合信號發(fā)生器產(chǎn)生的頻率穩(wěn)定度和精確度要求，我們選擇DDS 直接數(shù)字頻率合成。頻率合成時(shí)，相位累加器在參考時(shí)鐘的作用下對時(shí)鐘脈沖進(jìn)行計(jì)數(shù)，同時(shí)將累加器輸出的累加相位與頻率控制字 K 預(yù)置的相位增量相加，以相加后的吉果形成正弦查詢表的地址；取出表中與該相位對應(yīng)的單元中的幅度量化正弦函數(shù)值，經(jīng) D／ A 轉(zhuǎn)換器輸出模擬信號，再經(jīng)低通濾波器平滑得到符合要求的模擬信號。它是電壓控制頻率的集成芯片，失真度很低。 在此 系統(tǒng)中，采用單片機(jī)作為控制比采用 FPGA 實(shí)現(xiàn)更簡便。 方案二：用 FPGA 等可編程器件作為控制模塊。然后判斷是否返回時(shí)處于等候狀態(tài)。 對于信號調(diào)制， 直接用電平發(fā)送容易收到干擾，而且效率也不高，我們只能用光電二極管來接收，抗干擾能力弱，如果調(diào)制，我們可以用高靈敏度的接 收 頭，里面有載波檢測電路，有抑制干擾的能力。 高精度的信號源對通信系統(tǒng)、電子對抗及各種電子測量技術(shù)十分重 要。本文介紹了 DDS(直接數(shù)字頻率合成 )的基本原理和工作特點(diǎn)，提出以 DDS 芯片 AD9850 芯片為核心利用 MSP430F169單片機(jī)控制 ，輔以必要的外圍電路，構(gòu)成一個(gè)輸出波形穩(wěn)定、精度較高的信號發(fā)生器。該信號發(fā)生器主要能產(chǎn)生標(biāo)準(zhǔn)的正弦波、方波與三角波 (鋸齒波 )，方波可調(diào)占空比 ，輸出單脈沖及雙脈沖，可以實(shí)現(xiàn)信號的調(diào)制，輸出 PSK、 ASK。隨著電子技術(shù)的發(fā)展，對信號源的頻率穩(wěn)定度、準(zhǔn)確度以及頻譜純度提出越來越高的要求。所以作品用到了信號調(diào)制。總體框圖如圖 21所 示 。 FPGA 可以實(shí)現(xiàn)各種復(fù)雜的邏輯功能，密度高，速度快，穩(wěn)定性好等許多有點(diǎn)?；诰C合性價(jià)比，確定選擇方案一。可輸入不同的外部電壓來實(shí)現(xiàn)不同的頻率輸出。相位累加器的最大計(jì)數(shù)長度與正弦查詢表中所存儲(chǔ)的相位分隔點(diǎn)數(shù)相同，由 于相位累加器的相位增量不同，將導(dǎo)致一周期內(nèi)的取樣點(diǎn)數(shù)不同，在取樣頻率 (由參考時(shí)鐘頻率決定 )不變的情況下，輸出信號的頻率也相應(yīng)變化。一方面，