本文首先推導(dǎo)出過采樣濾波器組精確重構(gòu)的條件,由于此時所需的約束條件數(shù)比臨界采樣時少,因而可以設(shè)計出頻域衰減特性更好的濾渡器組 然后提出了精碲重梅約束條件下原壅低通濾波器的一種新的設(shè)計方法.采用矢量的二次型約束優(yōu)化算法。談算法優(yōu)化方便,收斂速度快.與其它方法相比,濾渡器的阻帶衰減大。
上傳時間: 2013-10-13
上傳用戶:tfyt
分析了對功率MOSFET器件的設(shè)計要求;設(shè)計了基于EXB841驅(qū)動模塊的功率MOSFET驅(qū)動保護(hù)電路。該電路具有結(jié)構(gòu)簡單,實用性強(qiáng),響應(yīng)速度快等特點。在電渦流測功機(jī)勵磁線圈驅(qū)動電路中的實際應(yīng)用證明,該電路驅(qū)動能力及保護(hù)功能效果良好。
標(biāo)簽: MOSFET 功率 驅(qū)動保護(hù)電路 方案
上傳時間: 2014-01-25
上傳用戶:hz07104032
論述了過采樣Σ一AADC的基本原理及結(jié)構(gòu),分析了Σ一△調(diào)制器的頻域傳輸特性和系統(tǒng)的信噪比,給出了實現(xiàn)不同的A/D轉(zhuǎn)換精度必須滿足的條件和用單片機(jī)實現(xiàn)Σ一AADC的具體方法和電路.實際使用表明,該方法測量結(jié)果可靠,具有實用價值.
上傳時間: 2013-11-17
上傳用戶:gaome
開通過程[ t0 ~ t4 ]: -- 在 t0 前,MOSFET 工作于截止?fàn)顟B(tài),t0 時,MOSFET 被驅(qū)動開通; -- [t0-t1]區(qū)間,MOSFET 的GS 電壓經(jīng)Vgg 對Cgs 充電而上升,在t1 時刻,到達(dá)維持電壓Vth,MOSFET 開始導(dǎo)電;
上傳時間: 2013-10-14
上傳用戶:ks201314
越柬越多的應(yīng)用 例如過程控制、稱重等 都需要高分辨率、高集成度和低價格的ADC。 新型Σ .△轉(zhuǎn)換技術(shù)恰好可以滿足這些要求 然而, 很多設(shè)計者對于這種轉(zhuǎn)換技術(shù)并不 分了解, 因而更愿意選用傳統(tǒng)的逐次比較ADC Σ.A轉(zhuǎn)換器中的模擬部分非常簡單(類似j 個Ibit ADC), 而數(shù)字部分要復(fù)雜得多, 按照功能町劃分為數(shù)字濾波和抽取單元 由于更接近r 個數(shù)字器件,Σ △ADC的制造成本非常低廉.
標(biāo)簽: ADC
上傳時間: 2013-10-24
上傳用戶:han_zh
MTK使用的是6229的BB芯片,Transeiver使用的是MT6140,PA為3159芯片。
上傳時間: 2013-11-23
上傳用戶:離殤
介紹一種簡便的方法, 只用軟件就可以將轉(zhuǎn)換器位數(shù)提高, 并且還能同時提高采樣系統(tǒng)的信噪比。通過實際驗證, 證明該方法是成功的。
上傳時間: 2013-11-11
上傳用戶:zhenyushaw
Abstract: A laser module designer can use a fixed resistor, mechanical pot, digital pot, or a digital-to-analogconverter (DAC) to control the laser driver's modulation and bias currents. The advantages of a programmablemethod (POT or DAC) are that the manufacturing process can be automated and digital control can be applied(e.g., to compensate for temperature). Using POTs can be a more simple approach than a DAC. There can be aslight cost advantage to using a POT, but this is usually not significant relative to other pieces of the design.Using a DAC can offer advantages, including improved linearity (translating to ease of software implementationand ability to hit the required accuracy), increased board density, a wider range of resolutions, a betteroptimization range, ease of use with a negative voltage laser driver, and unit-to-unit consistency
標(biāo)簽: POT DAC 應(yīng)用筆記 校準(zhǔn)
上傳時間: 2013-11-13
上傳用戶:ca05991270
Abstract: IC switches and multiplexers are proliferating, thanks to near-continual progress in lowering the supply voltage,incorporating fault-protected inputs, clamping the output voltage, and reducing the switch resistances. The latest of these advancesis the inclusion of precision resistors to allow two-point calibration of gain and offset in precision data-acquisition systems.
標(biāo)簽: 校準(zhǔn)復(fù)用器 校準(zhǔn)
上傳時間: 2013-11-12
上傳用戶:acwme
The purpose of this application note is to show an example of how a digital potentiometer can be used in thefeedback loop of a step-up DC-DC converter to provide calibration and/or adjustment of the output voltage.The example circuit uses a MAX5025 step-up DC-DC converter (capable of generating up to 36V,120mWmax) in conjunction with a DS1845, 256 position, NV digital potentiometer. For this example, the desiredoutput voltage is 32V, which is generated from an input supply of 5V. The output voltage can be adjusted in35mV increments (near 32V) and span a range wide enough to account for resistance, potentiometer and DCDCconverter tolerances (27.6V to 36.7V).
標(biāo)簽: DC-DC 數(shù)字電位器 升壓型 校準(zhǔn)
上傳時間: 2014-12-23
上傳用戶:781354052
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