目 錄 實驗一、 電路仿真基礎 ………………………………………………………… 1 實驗二、 系統(tǒng)仿真基礎 ………………………………………………………… 20 實驗三、 DC仿真和電路模型 …………………………………………………… 36 實驗四、 AC仿真和調(diào)整 ………………………………………………………… 55 實驗五、 S參數(shù)仿真和優(yōu)化 …………………………………………………… 72 實驗六、 濾波器:瞬態(tài),設計指導,momentum,DAC …………………… 95 實驗七、 諧波平衡仿真 …………………………………………………………115 實驗八、 電路包絡仿真 …………………………………………………………132 實驗九、 最終電路/系統(tǒng)仿真 ………………………………………………… 147 附錄A、 射頻瞬態(tài)仿真器 ………………………………………………………167 附錄B、 諧波平衡仿真器 ………………………………………………………173 附錄C、電路包絡仿真器 ……………………………………………………… 181 《ADS2005仿真實驗教程》是設計一個用于1900MHz GSM的RF接收系統(tǒng),包含的部件主要有: ? 200MHz由集總參數(shù)元件構(gòu)成的低通濾波器 ? 1900MHz由微帶線構(gòu)成的帶通濾波器 ? 1900MHz的功放 ? 把1900MHz變到200MHz的混頻器 ? 其他小部件 在完成這個系統(tǒng)的過程中,就可以掌握目錄所示的內(nèi)
上傳時間: 2013-04-24
上傳用戶:Minly
General Description The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with both three- and four-phase motors. It can directly drive the power switching devices used to drive the motor. The LM621 provides an adjustable dead-time circuit to eliminate ``shootthrough'' current spiking in the power switching circuitry. Operation is from a 5V supply, but output swings of up to 40V are accommodated. The part is packaged in an 18-pin, dual-in-line package.
上傳時間: 2013-07-24
上傳用戶:sdq_123
AC/DC適配器(ADAPTER)高頻電子變壓器的設計有很多制約條件,比如空間體積、熱的問題、轉(zhuǎn)換器的效率、電磁干擾、PWM控制IC、性價比等。所以磁心選用受到一定的限制,不像一般資料中介紹的滿足功率容量即可,選擇的余地不大。所以本文不講解具體的磁心選擇,僅利用計算軟件對磁心的功率容量進行校驗。目前與NOTEBOOK和LCD配套的中高檔ADAPTER工作頻率在60KHz~100KHz左右。變壓器的繞組已用上了三重絕緣線,再要做小變壓器已經(jīng)有難度。我們知道小型化開關變壓器有兩種方法:一、提高開關頻率,帶來的問題是對EMI的控制有一定難度;二、選用更高飽和磁通密度的磁心材料,如TDK公司的PC95和PE33 見表(1)。如果在100℃時Bsat能達到450mT~500mT,那么我們在設計開關變壓器時就能使用更少的圈數(shù),減少銅損,同時又能提高初級繞組的電感量,降低峰值電流,減少開關管的能量損耗,從而減少開關變壓器的體積,進一步地實現(xiàn)ADAPTER的小型化。
上傳時間: 2013-08-04
上傳用戶:bjgaofei
關于 ‘‘地’’ 電路中參考點-零電位點,稱為地點。開關電源中的‘‘地’’:: 公共端 (common)(common)-輸出與輸入?yún)⒖键c。例如-PFCPFC與后繼變換器輸入端的公共端。 電路中的地 (ground(ground--GND)GND)-所有電路共用參考-點。如輔助電源與PFCPFC及DC/DCDC/DC公共端。 大地 (earth(earth--E)電網(wǎng)供電設備通常以大地EE作為零電位。三相輸配電三相中點接大地EE,同時引出中,線NN。 接地阻抗很小的大面積 ‘‘地’’稱為地平面(Ground plane(plane)。
上傳時間: 2013-04-24
上傳用戶:1079836864
The LTC®1966 is a true RMS-to-DC converter that uses aDS computational technique to make it dramatically simplerto use, significantly more accurate, lower in powerconsumption and more flexible than conventional logantilogRMS-to-DC converters. The LTC1966 RMS-to-DCconverter has an input signal range from 5mVRMS to1.5VRMS (a 50dB dynamic range with a single 5V supplyrail) and a 3dB bandwidth of 800kHz with signal crestfactors up to four.
標簽: 真有效值 轉(zhuǎn)換器 自動調(diào)節(jié)
上傳時間: 2013-10-12
上傳用戶:qilin
ANALOG INPUT BANDWIDTH is a measure of the frequencyat which the reconstructed output fundamental drops3 dB below its low frequency value for a full scale input. Thetest is performed with fIN equal to 100 kHz plus integer multiplesof fCLK. The input frequency at which the output is −3dB relative to the low frequency input signal is the full powerbandwidth.APERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DELAY See Sampling Delay.BOTTOM OFFSET is the difference between the input voltagethat just causes the output code to transition to the firstcode and the negative reference voltage. Bottom Offset isdefined as EOB = VZT–VRB, where VZT is the first code transitioninput voltage and VRB is the lower reference voltage.Note that this is different from the normal Zero Scale Error.CONVERSION LATENCY See PIPELINE DELAY.CONVERSION TIME is the time required for a completemeasurement by an analog-to-digital converter. Since theConversion Time does not include acquisition time, multiplexerset up time, or other elements of a complete conversioncycle, the conversion time may be less than theThroughput Time.DC COMMON-MODE ERROR is a specification which appliesto ADCs with differential inputs. It is the change in theoutput code that occurs when the analog voltages on the twoinputs are changed by an equal amount. It is usually expressed in LSBs.
標簽: Converter Defi ADC 轉(zhuǎn)換器
上傳時間: 2013-11-12
上傳用戶:pans0ul
出了一種新型的低成本單相在線不間斷電源(UPS)。該系統(tǒng)包括具有功率因數(shù)校正(PFC)功能的整流/升壓轉(zhuǎn)換器和連接到DC-Link總線的兩橋臂逆變器,電池組通過一個非常簡單的系統(tǒng)可直接連接到DC-Link總線。采用6開關管的架構(gòu),相對于傳統(tǒng)的8開關管全橋拓撲結(jié)構(gòu)的系統(tǒng)降低了成本。即使在非線性負載下,該系統(tǒng)仍具有功率密度高和高品質(zhì)輸出電壓的特點。最后詳細描述了電路操作、分析以及模擬和實驗結(jié)果。
上傳時間: 2013-11-04
上傳用戶:雨出驚人love
在汽車、工業(yè)和電信行業(yè)的設計師當中,使用高功率升壓型轉(zhuǎn)換器的現(xiàn)像正變得越來越普遍。當需要 300W 或更高的功率時,必須在功率器件中實現(xiàn)高效率 (低功率損耗),以免除增設龐大散熱器和采用強迫通風冷卻的需要
標簽: 348W 升壓型轉(zhuǎn)換器 功率 散熱器
上傳時間: 2014-12-01
上傳用戶:lhc9102
SM7505是應用于離線式小功率AC/DC開關電源的高性能原邊反饋控制功率開關芯片,在全電壓輸入范圍內(nèi)實現(xiàn)高精度恒壓/恒流輸出,精度均小于±3℅,并可使系統(tǒng)節(jié)省光耦和TL431等元件,降低成本。芯片內(nèi)部集成了高壓功率開關、逐周期峰值電流限制、VDD過壓保護、VDD欠壓保護、VDD電壓嵌位等完善的保護功能,以提高系統(tǒng)的可靠性。內(nèi)置輸出線壓降補償和前沿消隱電路(LEB),SOP8的封裝形式。主要應用于LED照明驅(qū)動,小功率電源配適器,電腦、電視等產(chǎn)品的輔助電源或待機電源等
上傳時間: 2013-12-12
上傳用戶:咔樂塢
鎖定放大是微弱信號檢測的重要手段。基于相關檢測理論,利用開關電容的開關實現(xiàn)鎖定放大器中乘法器的功能,提出開關電容和積分器相結(jié)合以實現(xiàn)相關檢測的方法,并設計出一種鎖定放大器。該鎖定放大器將微弱信號轉(zhuǎn)化為與之相關的方波,通過后續(xù)電路得到正比于被測信號的直流電平,為后續(xù)采集處理提供方便。測量數(shù)據(jù)表明鎖定放大器前級可將10-6 A的電流轉(zhuǎn)換為10-1 V的電壓,后級通過帶通濾波器級聯(lián)可將信號放大1×105倍。該方法在降低噪聲的同時,可對微弱信號進行放大,線性度較高、穩(wěn)定性較好。 Abstract: Lock-in Amplifying(LIA)is one of important means for weak signal detection. Based on cross-correlation detection theory, switch in the swithched capacitor was used as multiplier of LIA, and a new method of correlation detection was proposed combining swithched capacitor with integrator. A kind of LIA was designed which can convert the weak signal to square-wave, then DC proportional to measured signal was obtained through follow-up conditioning circuit, providing convenience for signal acquisition and processing. The measured data shows that the electric current(10-6 A) can be changed into voltage(10-1 V) by LIA, and the signal is magnified 1×105 times by cascade band-pass filter. The noise is suppressed and the weak signal is amplified. It has the advantages of good linearity and stability.
上傳時間: 2013-11-29
上傳用戶:黑漆漆