REXROTH電子放大器#REXROTH功率放大器#REXROTH比例放大器
德國REXROTH放大器能把輸入訊號的電壓或功率放大的裝置，REXROTH放大器由電子管或晶體管、電源變壓器和其他電器元件組成。REXROTH放大器用在通訊、廣播、雷達(dá)、電視、自動控制等各種裝置中。
REXROTH放大器的原理: 高頻功率放大器用于發(fā)射機(jī)的末級，作用是將高頻已調(diào)波信號進(jìn)行功率放大，以滿足發(fā)送功率的要求，然后經(jīng)過天線將其輻射到空間，保證在一定區(qū)域內(nèi)的接收機(jī)可以接收到滿意的信號電平，并且不干擾相鄰信道的通信。
REXROTH放大器高頻功率放大器是通信系統(tǒng)中發(fā)送裝置的重要組件。按其工作頻帶的寬窄劃分為窄帶高頻功率放大器和寬帶高頻功率放大器兩種，窄帶高頻功率放大器通常以具有選頻濾波作用的選頻電路作為輸出回路，故又稱為調(diào)諧功率放大器或諧振功率放大器；寬帶高頻功率放大器的輸出電路則是傳輸線變壓器或其他寬帶匹配電路，因此又稱為非調(diào)諧功率放大器。高頻功率放大器是一種能量轉(zhuǎn)換器件，它將電源供給的直流能量轉(zhuǎn)換成為高頻交流輸出在
“低頻電子線路"課程中已知，放大器可以按照電流導(dǎo)通角的不同，將其分為甲、乙、丙三類工作狀態(tài)。甲類放大器電流的流通角為360o，適用于小信號低功率放大。乙類放大器電流的流通角約等于
180o；丙類放大器電流的流通角則小于180o。乙類和丙類都適用于大功率工作丙類工作狀態(tài)的輸出功率和效率是三種工作狀態(tài)中zui高者。高頻功率放大器大多工作于丙類。但丙類放大器的電流波形失真太大，因而不能用于低頻功率放大，只能用于采用調(diào)諧回路作為負(fù)載的諧振功率放大。由于調(diào)諧回路具有濾波能力，回路電流與電壓仍然極近于正弦波形，失真很小。
力士樂放大器所產(chǎn)生的直流誤差使失調(diào)和失調(diào)漂移降到zui低。在-40℃~+125℃溫度范圍內(nèi)，它具有10μVzui大輸入失調(diào)電壓和65
nV/℃zui大輸入失調(diào)電壓漂移。DIGIN是單線串行接口，通過它對放大器的增益和輸出失調(diào)進(jìn)行調(diào)整設(shè)置，增益調(diào)整范圍是70~1280，二級放大器的增益可以分別單獨(dú)進(jìn)行設(shè)置和調(diào)整，調(diào)整到預(yù)定的增益值后，再利用DigiTrim多晶硅熔絲技術(shù)固定放大器的增益設(shè)置，實(shí)現(xiàn)增益*設(shè)定。*級增益調(diào)整通過調(diào)整Pl和P2的128步7bit編碼進(jìn)行，范圍為4.00~6.40；第二級增益調(diào)整通過調(diào)整P3和P4的8步3
bit編碼，范圍為17.5~200。在*性固定放大器的增益設(shè)定值之前，為獲得*校準(zhǔn)精度，可暫時在路設(shè)置和反復(fù)調(diào)節(jié)調(diào)整值。*級增益與編碼值的關(guān)系見公式(1)；第二級增益與編碼值的關(guān)系如表l所列，放大器總增益GAlN=CAIN1xGAIN2。放大器的輸出電壓VOUT可由公式(3)算出，其中GAIN為電路對于差分輸入的默認(rèn)內(nèi)部初始增益，大小為70。當(dāng)2個輸入都接地時，因*項接近0
V或zui大10 mV(由于輸入放大器誤差)，這時電路的輸出電壓VOUT等于VDAC。
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REXROTH電子放大器#REXROTH功率放大器#REXROTH比例放大器
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