基于通用集成運(yùn)算放大器，利用MASON公式設(shè)計(jì)了一個(gè)多功能二階通用濾波器，能同時(shí)或分別實(shí)現(xiàn)低通、高通和帶通濾波，也能設(shè)計(jì)成一個(gè)正交振蕩器。電路的極點(diǎn)頻率和品質(zhì)因數(shù)能夠獨(dú)立、精確地調(diào)節(jié)。電路使用4個(gè)集成運(yùn)放、2個(gè)電容和11個(gè)電阻，所有集成運(yùn)放的反相端虛地。利用計(jì)算機(jī)仿真電路的通用濾波功能、極點(diǎn)頻率和品質(zhì)因數(shù)的獨(dú)立控制和正交正弦振蕩，從而證明該濾波器正確有效。 Abstract: A new multifunctional second-order filter based on OPs was presented by MASON formula. Functions， such as high-pass， band-pass， low-pass filtering， can be realized respectively and simultaneously， and can become a quadrature oscillator by modifying resistance ratio. Its pole angular frequency and quality factor can be tuned accurately and independently. The circuit presented contains four OPs， two capacitors， and eleven resistances， and inverting input of all OPs is virtual ground. Its general filtering， the independent control of pole frequency and quality factor and quadrature sinusoidal oscillation were simulated by computer， and the result shows that the presented circuit is valid and effective.
標(biāo)簽： MASON 多功能 二階 濾波器設(shè)計(jì)
上傳時(shí)間： 2013-10-09
上傳用戶：13788529953
在Multisim 10軟件環(huán)境下，設(shè)計(jì)一種由運(yùn)算放大器構(gòu)成的精確可控矩形波信號(hào)發(fā)生器，結(jié)合系統(tǒng)電路原理圖重點(diǎn)闡述了各參數(shù)指標(biāo)的實(shí)現(xiàn)與測(cè)試方法。通過改變RC電路的電容充、放電路徑和時(shí)間常數(shù)實(shí)現(xiàn)了占空比和頻率的調(diào)節(jié)，通過多路開關(guān)投入不同數(shù)值的電容實(shí)現(xiàn)了頻段的調(diào)節(jié)，通過電壓取樣和同相放大電路實(shí)現(xiàn)了輸出電壓幅值的調(diào)節(jié)并提高了電路的帶負(fù)載能力，可作為頻率和幅值可調(diào)的方波信號(hào)發(fā)生器。Multisim 10仿真分析及應(yīng)用電路測(cè)試結(jié)果表明，電路性能指標(biāo)達(dá)到了設(shè)計(jì)要求。 Abstract: Based on Multisim 10， this paper designed a kind of rectangular-wave signal generator which could be controlled exactly composed of operational amplifier， the key point was how to implement and test the parameter indicators based on the circuit diagram. The duty and the frequency were adjusted by changing the time constant and the way of charging and discharging of the capacitor， the width of frequency was adjusted by using different capacitors provided with multiple switch， the amplitude of output voltage was adjusted by sampling voltage and using in-phase amplifier circuit，the ability of driving loads was raised， the circuit can be used as squarewave signal generator whose frequency and amplitude can be adjusted. The final simulation results of Multisim 10 and the tests of applicable circuit show that the performance indicators of the circuit meets the design requirements.
標(biāo)簽： Multisim 矩形波 信號(hào)發(fā)生器 仿真
上傳時(shí)間： 2014-01-21
上傳用戶：shen007yue
要生產(chǎn)音頻脈沖，只要算出某一音頻的周期(1/頻率)，可以利用定時(shí)器計(jì)時(shí)的方式得到此頻率的脈沖。而Arduino平臺(tái)“封裝”了新的數(shù)字輸出函數(shù)tone()。更簡易的實(shí)現(xiàn)喇叭和蜂鳴器唱歌。 tone(pin, frequency)，Arduino會(huì)向指定pin發(fā)送制定頻率的方波，執(zhí)行noTone()函數(shù)來停止。 tone(pin, frequency, duration方法多了一個(gè)參數(shù)，代表發(fā)送方波持續(xù)的時(shí)間，到時(shí)自動(dòng)停止發(fā)送信號(hào)，就不需要noTone()函數(shù)。 利用tone()函數(shù)播放音樂，只需要查表了解各個(gè)音符對(duì)應(yīng)的頻率，還要求個(gè)人稍微能看懂音樂譜子的節(jié)拍。 物料清單 ： Arduino 328控制板 1塊 8Ω 0.5W的喇叭（或者蜂鳴器） 1個(gè)（ATmega328的驅(qū)動(dòng)能力足夠，直接拉電流就ok!） 12Ω電阻(限流) 1個(gè) 實(shí)物圖：
標(biāo)簽： Arduino 328 控制板 制作音樂
上傳時(shí)間： 2013-10-14
上傳用戶：jiangxiansheng
This application note discusses a variety of approaches for interfacing analog signals to 5V powered systems. Synthesizing a "rail-to-rail" op amp and scaling techniques for A/D converters are covered. A voltage-to-frequency converter, applicable where high resolution is required, is also presented.
標(biāo)簽： 微處理器 系統(tǒng)接口
上傳時(shí)間： 2013-10-12
上傳用戶：181992417
ZigBee™ 是專為低速率傳感器和控制網(wǎng)絡(luò)設(shè)計(jì)的無線網(wǎng)絡(luò)協(xié)議。有許多應(yīng)用可從ZigBee 協(xié)議受益，其中可能的一些應(yīng)用有：建筑自動(dòng)化網(wǎng)絡(luò)、住宅安防系統(tǒng)、工業(yè)控制網(wǎng)絡(luò)、遠(yuǎn)程抄表以及PC 外設(shè)。此程序包提供的是Zigbee協(xié)義棧函數(shù)庫源代碼，它實(shí)現(xiàn)了一個(gè)與物理層 無關(guān)的應(yīng)用程序接口。 因此，無需做重大修改就可以輕松地在射頻（Radio Frequency，RF）收發(fā)器之間移植應(yīng)用程序。
標(biāo)簽： ZigBee 8482 協(xié)議 低速
上傳時(shí)間： 2014-01-16
上傳用戶：Pzj
Random Number Generators（隨機(jī)數(shù)生成）包括gaussian random number generator、uniform random number generator、low-frequency hold generator、1/f noise generator等5種隨機(jī)信號(hào)生成的c源代碼
標(biāo)簽： generator random number Generators
上傳時(shí)間： 2014-12-07
上傳用戶：edisonfather
頻率調(diào)制，It is a diffrent matlab code for frequency modulation.
上傳時(shí)間： 2015-05-30
上傳用戶：wanqunsheng
Routine mampres: To obtain amplitude response from h(exp(jw)). input parameters: h :n dimensioned complex array. the frequency response is stored in h(0) to h(n-1). n :the dimension of h and amp. fs :sampling frequency (Hz). iamp:If iamp=0: The Amplitude Res. amp(k)=abs(h(k)) If iamp=1: The Amplitude Res. amp(k)=20.*alog10(abs(h(k))). output parameters: amp :n dimensioned real array. the amplitude-frequency response is stored in amp(0) to amp(n-1). Note: this program will generate a data file "filename.dat" . in chapter 2
標(biāo)簽： dimensione parameters amplitude response
上傳時(shí)間： 2013-12-19
上傳用戶：xfbs821
Rotating shafts experience a an elliptical motion called whirl. It is important to decompose this motion into a forward and backward whil orbits. The current function makes use of two sensors to generate a bi-directional spectrogram. The method can be extended to any time-frequency distribution ％ ％ compute the forward/backward Campbell/specgtrogram ％ ％ INPUT: ％ y (n x 2) each column is measured from a different sensor ％ /////// ％ __ ％ |s1| y(:,1) ％ |__| ％ __ ％ / \ ________|/ ％ | | | s2 |/ y(:,2) ％ \____/ --------|/ ％ ％ Fs Sampling frequnecy ％ ％ OUTPUT: ％ B spectrogram/Campbel diagram ％ x x-axis coordinate vector (time or Speed) ％ y y-axis coordinate vector (frequency [Hz])
標(biāo)簽： experience elliptical decompose important
上傳時(shí)間： 2015-06-23
上傳用戶：372825274
his project was built and tested with WinAVR-20060125. Make sure the MCU target define in the Makefiles corresponds to the AVR you are using!! To build the code, just install WinAVR and run "make" from the console in echomaster and echoslave subdirs. "make program" will program the device if you have a AVRISP attached. Remember to set the AVR device to at least 8MHz. The AVR may use the programmable clock from MC1319x, just remember to check if the MC1319x and SPI communication is working FIRST! Otherwise you wont get any clock signal to the AVR and then you can t program it or reset the fuses! The MC1319x has default clock output of 32kHz so you will have to set your programmer to a very low frequency (<=32kHz/4) to be able to program it while it is running on that!
標(biāo)簽： the 20060125 project WinAVR
上傳時(shí)間： 2014-10-10
上傳用戶：yan2267246
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