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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      河北本振生產

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      來源: 發布時間:2022年04月26日

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      本振有什么特點?特點:1,對振蕩頻率的選取有要求;要求振蕩器的振蕩頻率和幅度精度高,穩定性好;2,有鎖相環,數字分頻、數字鑒相器等電路,保證極高的穩定度,否則會產生本振頻率漂移;3,都有鎖相環電路來保證本振頻率的穩定度;4,一般采用穩定性好的晶體振蕩器;5,振蕩頻率高,易起振,振頻穩,振幅高,振蕩特性好;6,本振電路多采用體積小、可靠性高的單片大規模集成數字頻率合成器,7,每一級電源都應有0.1 uF或0.01 uF的旁路電容接地;8,電源可數模分開供電,接地及屏蔽良好,本振輸出端有帶通濾波器,使本振輸出雜波小。頻率綜合器的振幅在一定范圍內隨頻率變化。河北本振生產

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      河北本振生產,頻率綜合器

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      具有高穩定度、高精確度、大信噪比、低相位噪聲的頻率綜合器在其他方面可以作為各種設備的頻率發生器和信號源,有著廣闊的應用。高性能頻率綜合器普遍應用在現代通信、雷達和電子測量等技術領域中。頻率合成基本方法主要有3種:直接合成法、鎖相環頻率合成法和直接數字頻率合成法。隨著通信技術的發展,人們對頻譜資源需求也越來越大,頻綜也向小型化、頻率分辨率低、跳頻速度快、頻帶寬、低雜散方向發展。跳頻通信是傳輸信號的頻率可以隨著事先設定的變化的載波頻率而變化的一種通信方式。跳頻通信系統中可變頻綜是其主要關鍵技術之一,可變頻綜指標直接影響著跳頻通信系統性能。河北本振生產頻率綜合器在通訊、 雷達、 電子對抗、 遙控遙測和儀器儀表等眾多領域得到了普遍應用。

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      河北本振生產,頻率綜合器

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      頻率合成器是將一個高精確度和高穩定度的標準參考頻率,經過混頻、倍頻與分頻等對它進行加、減、乘、除的四則運算,產生大量的具有同樣精確度和穩定度的不同頻率信號的頻率源。頻率綜合器的頻率范圍: 頻率范圍是指頻率合成器輸出的較低頻率f(min)和較高頻率f(max)之間的變化范圍。 頻率間隔(頻率分辨率) 頻率合成器 輸出是不連續的。兩個相鄰頻率之間的較小間隔,就是頻率間隔。頻率間隔又稱為頻率分辨率。不同用途的頻率合成器,對頻率間隔的要求是不相同的。對短波單邊帶同信來說,現在多取頻率間隔為100Hz,有的甚至取10Hz,1Hz乃至0.1Hz。這次設計的頻率合成器,我們用的是10KHz。

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      如何選擇鎖相環(PLL)頻率合成器中的其它元件呢?電壓控制振蕩器(VCO): VCO將所施加的調諧電壓轉換為輸出頻率。在VCO的整個頻率范圍上,其靈敏度可能相差極大,這可能會導致環路不穩定(參見“環路濾波器”部分)。一般而言,VCO的調諧靈敏度 (Kv)越低,VCO相位噪聲性能越好。載波偏離較小時,頻率合成器的相位噪聲占主導地位。載波偏離較大時,VCO的高通濾波噪聲將開始占主導地位。在1-MHz偏移時,GSM的帶外相位噪聲特性為-130 dBc/Hz。環路濾波器:環路濾波器的類型多種多樣。比較常見的類型是三階積分器。 一般而言,環路濾波器帶寬應為PFD頻率(通道間隔)的1/10。提高環路帶寬會縮短鎖定時間,但濾波器帶寬絕不應超過PFD/5,否則會大幅增加不穩定性。頻率源技術,頻率源即頻率合成器。

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      河北本振生產,頻率綜合器

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      頻率綜合器被譽為現在電子系統的“心臟”,是當今通信、雷達等電子系統實現高效性能指標的關鍵部分??梢哉f,現代電子設備和系統功能的實現都直接依賴于所用頻率源的性能。在頻率發生方面,采用直接數字頻率合成(DDS)芯片和高穩定晶體為整個系統提供高精、高穩、低噪、高速的信號作為參考信號。在頻率提升方面,采用倍頻器作為主要器件,提高了頻率轉換速度,簡化了系統結構,提高了可靠性和穩定性。在電路控制方面,使用FPGA控制和傳輸數據,易于調試和擴展功能。在電路設計方面,采用了模塊化的設計,方便調試和外接其他電路實現不同的功能。頻綜的主要功能是產生電子系統需要的各種形式的頻率信號。河北本振生產

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      多通道頻率綜合器具有標準的通信端口USB和ETHERNET,以及可選的GPIB。河北本振生產

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      一種降低小數分頻雜散的聰明的做法是利用一個可變參考頻率。該技術基于一個小數N分頻綜合器的雜散的位置是其特定分頻比和輸出頻率的函數的原理。因此,對于一個給定的輸出頻率,可以通過改變參考頻率和相應的分頻比的方式來移動(然后過濾掉)一個不想要的雜散。這涉及到頻率規劃,因此需要一個額外的頻率綜合器(用作參考頻率)。此外盡管減小了分頻比,其依然可能大到影響PLL性能。在頻率綜合器反饋路徑上使用頻率轉換(混頻)技術可以提高頻率綜合器的主要特性,河北本振生產

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      安鉑克科技(上海)有限公司是一家生產型類企業,積極探索行業發展,努力實現產品創新。公司致力于為客戶提供安全、質量有保證的良好產品及服務,是一家有限責任公司(自然)企業。公司始終堅持客戶需求優先的原則,致力于提供高質量的微波模擬信號發生器,矢量信號發生器,頻率綜合器,相位噪聲分析儀。安鉑克科技順應時代發展和市場需求,通過**技術,力圖保證高規格高質量的微波模擬信號發生器,矢量信號發生器,頻率綜合器,相位噪聲分析儀。

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