Abstract: This application note describes a new generation of digital-input Class D audio amplifiers that achieve high PSRRperformance, comparable to traditional analog Class D amplifiers. More importantly, these digital-input Class D amplifiersprovide additional benefits of reduced power, complexity, noise, and system cost.
Class="tags">標(biāo)簽： 數(shù)字輸入放大器 系統(tǒng)設(shè)計(jì)
Class="time">上傳時(shí)間： 2013-12-20
Class="username">上傳用戶：JIUSHICHEN
交流功率因數(shù)轉(zhuǎn)換器 特點(diǎn)： 精確度0.25%滿刻度 ±0.25o 多種輸入,輸出選擇 輸入與輸出絕緣耐壓2仟伏特/1分鐘 沖擊電壓測試5仟伏特(1.2x50us) (IEC255-4,ANSI C37.90a/1974) 突波電壓測試2.5仟伏特(0.25ms/1MHz) (IEC255-4) 尺寸小，穩(wěn)定性高 主要規(guī)格： 精確度: 0.25% F.S. ±0.25°(23 ±5℃) 輸入負(fù)載: <0.2VA (Voltage) <0.2VA (Current) 最大過載能力: Current related input: 3 x rated continuous 10 x rated 30 sec. 25 x rated 3sec. 50 x rated 1sec. Voltage related input:maximum 2 x rated continuous 輸出反應(yīng)速度: < 250ms(0~90%) 輸出負(fù)載能力: < 10mA for voltage mode < 10V for current mode 輸出之漣波: < 0.1% F.S. 歸零調(diào)整范圍: 0~ ±5% F.S. 最大值調(diào)整范圍: 0~ ±10% F.S. 溫度系數(shù): 100ppm/℃ (0~50℃) 隔離特性: Input/Output/Power/Case 絕緣抗阻: >100Mohm with 500V DC 絕緣耐壓能力: 2KVac/1 min. (input/output/power/case) 突波測試: ANSI C37.90a/1974,DIN-IEC 255-4 impulse voltage 5KV(1.2x50us) 使用環(huán)境條件: -20~60℃(20 to 90% RH non-condensed) 存放環(huán)境條件: -30~70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
Class="tags">標(biāo)簽： 交流 功率因數(shù)轉(zhuǎn)換器
Class="time">上傳時(shí)間： 2013-10-22
Class="username">上傳用戶：thing20
交流頻率轉(zhuǎn)換器 特點(diǎn)： 精確度0.05%滿刻度(Accuracy 0.05%F.S.) 多種輸入,輸出選擇 輸入與輸出絕緣耐壓2仟伏特/1分鐘 沖擊電壓測試5仟伏特(1.2x50us) (IEC255-4,ANSI C37.90a/1974) 突波電壓測試2.5仟伏特(0.25ms/1MHz) (IEC255-4) 尺寸小，穩(wěn)定性高 2:主要規(guī)格 精確度: 0.05% F.S. (23 ±5℃) 輸入負(fù)載: <0.2VA 最大過載能力:maximum 2 x rated continuous 輸出反應(yīng)時(shí)間: <250ms (0~90%) 輸出負(fù)載能力: <10mA for voltage mode <10V for current mode 輸出漣波: <0.1% F.S. 歸零調(diào)整范圍: 0~±5% F.S. 最大值調(diào)整范圍: 0~±10% F.S. 溫度系數(shù): 50ppm/℃ (0~50℃) 隔離特性: Input/Output/Power/Case 絕緣抗阻: >100M ohm with 500V DC 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 行動(dòng)測試: ANSI C37.90a/1974,DIN-IEC 255-4 impulse voltage 5KV (1.2 x 50us) 突波測試: 2.5KV-0.25ms/1MHz 使用環(huán)境條件: -20~60℃(20 to 90% RH non-condensed) 存放環(huán)境條件: -30~70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
Class="tags">標(biāo)簽： 交流 頻率轉(zhuǎn)換器
Class="time">上傳時(shí)間： 2013-10-11
Class="username">上傳用戶：xzt
交流電壓，電流轉(zhuǎn)換器 特點(diǎn)： 精確度0.25%滿刻度(RMS) 多種輸入,輸出選擇 輸入與輸出絕緣耐壓2仟伏特/1分鐘 沖擊電壓測試5仟伏特(1.2x50us) (IEC255-4,ANSI C37.90a/1974) 突波電壓測試2.5仟伏特(0.25ms/1MHz) (IEC255-4) 尺寸小，穩(wěn)定性高 2:主要規(guī)格 精確度:0.25%F.S.(RMS) (23 ±5℃) 輸入負(fù)載: <0.2VA(voltage) <0.2VA(current) 最大過載能力: Current related input:3 x rated continuous 10 x rated 30 sec. ,25 x rated 3sec. 50 x rated 1sec. Voltage related input:maximum 2x rated continuous 輸出反應(yīng)時(shí)間: <250ms (0~90%) 輸出負(fù)載能力: <10mA for voltage mode <10V for current mode 輸出漣波: <0.1% F.S. 歸零調(diào)整范圍: 0~±5% F.S. 最大值調(diào)整范圍: 0~±10% F.S. 溫度系數(shù): 100ppm/℃ (0~50℃) 隔離特性: Input/Output/Power/Case 絕緣抗阻: >100Mohm with 500V DC 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 行動(dòng)測試: ANSI C37.90a/1974,DIN-IEC 255-4 impulse voltage 5KV (1.2 x 50us) 突波測試: 2.5KV-0.25ms/1MHz 使用環(huán)境條件: -20~60℃(20 to 90% RH non-condensed) 存放環(huán)境條件: -30~70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
Class="tags">標(biāo)簽： 交流電壓 電流轉(zhuǎn)換器
Class="time">上傳時(shí)間： 2013-11-09
Class="username">上傳用戶：非衣2016
Abstract: Class D amplifiers are typically very efficient, making them ideal candidates for portable applications that require longbattery life and low thermal dissipation. However, electromagnetic interference (EMI) is an issue that commonly accompanies theClass D switching topology. Active-emissions limiting reduces radiated emissions and enables "filterless" operation, allowingdesigners to create small, efficient portable applications with low EMI.
Class="tags">標(biāo)簽： EMI D類放大器 保持 便攜式產(chǎn)品
Class="time">上傳時(shí)間： 2013-11-23
Class="username">上傳用戶：哈哈hah
Low power operation of electronic apparatus has becomeincreasingly desirable. Medical, remote data acquisition,power monitoring and other applications are good candidatesfor battery driven, low power operation. Micropoweranalog circuits for transducer-based signal conditioningpresent a special Class of problems. Although micropowerICs are available, the interconnection of these devices toform a functioning micropower circuit requires care. (SeeBox Sections, “Some Guidelines for Micropower Designand an Example” and “Parasitic Effects of Test Equipmenton Micropower Circuits.”) In particular, trade-offs betweensignal levels and power dissipation become painful whenperformance in the 10-bit to 12-bit area is desirable.
Class="tags">標(biāo)簽： 信號調(diào)理 微電路
Class="time">上傳時(shí)間： 2013-10-22
Class="username">上傳用戶：rocketrevenge
設(shè)計(jì)了水聲信號發(fā)生系統(tǒng)中的功率放大電路，可將前級電路產(chǎn)生的方波信號轉(zhuǎn)換為正弦信號，同時(shí)進(jìn)行濾波、功率放大，使其滿足換能器對輸入信號的要求。該電路以單片機(jī)AT89C52，集成6階巴特沃思低通濾波芯片MF6以及大功率運(yùn)算放大器LM12為核心，通過標(biāo)準(zhǔn)RS232接口與PC進(jìn)行通信，實(shí)現(xiàn)信號增益的程控調(diào)節(jié)，對干擾信號具有良好的抑制作用。經(jīng)調(diào)試該電路工作穩(wěn)定正常，輸出波形無失真，在輸出功率以及放大增益、波紋系數(shù)等方面均滿足設(shè)計(jì)要求。 This paper presented a design and implementation of underwater acoustic power amplifer. This circuit converted the rectangle signal generated by frontend circuit into the sine signal， then filtered and power amplification， it meets the requirements of the transducer.Included AT89C52， 6th order Butterworth filter MF6， hipower amplififier LM12.Communication with PC through the RS232 port. The signal gain is adjustable and could be remote controlled. It has a good inhibitory effect on the interference signal. After debugged， this circuit works stable， the output waveform has no distortion， it meets the design requirement in outprt power， amplifier gain and ripple factor.
Class="tags">標(biāo)簽： 水聲信號 功率放大器
Class="time">上傳時(shí)間： 2013-11-20
Class="username">上傳用戶：qwe1234
通過安裝和調(diào)試ＥＣＧ放大器，了解醫(yī)學(xué)信號放大器的特點(diǎn)，并掌握放大器的有關(guān)指標(biāo)。 安裝和調(diào)試后的ＥＣＧ放大器，應(yīng)達(dá)到以下指標(biāo)： １?具有較高輸入阻抗＞１ＭΩ ２?放大器差動(dòng)增益約為１０００ ３?具有較高共模抑制比（CMRR>80db） ４?等效輸入噪聲＜１０μＶ ５?頻帶范圍０.０５Ｈｚ～１００Ｈｚ
Class="tags">標(biāo)簽： ECG 放大器 調(diào)試
Class="time">上傳時(shí)間： 2013-10-18
Class="username">上傳用戶：taiyang250072
•Founded in Jan. 08, 2001 in Shanghai, China.•Fabless IDH focused on Analog & Mixed Signal Chip design & marketing •Over 100 IC introduced.•Over 200 OEM Customer worldwide•ISO-9000 Certified•Distribution Channel in Taiwan, China & Japan To achieve 100% customer satisfactionby producing the technically advanced product with the best quality, on-time delivery and service. Leverages on proprietary process and world-Class engineering team to develop innovative & high quality analog solutions that add value to electronics equipment.
Class="tags">標(biāo)簽： Circuit Analog Design Porta
Class="time">上傳時(shí)間： 2013-10-24
Class="username">上傳用戶：songnanhua
本文闡述電視機(jī)、顯示器和微機(jī)等產(chǎn)品的諧波電流產(chǎn)生原因，介紹抑制諧波電流的方法及設(shè)計(jì)時(shí)應(yīng)考慮的問題。 關(guān)鍵詞：諧波電流、抑制技術(shù)
Class="tags">標(biāo)簽： 諧波電流抑制
Class="time">上傳時(shí)間： 2013-11-01
Class="username">上傳用戶：a673761058
