Title : Implementation of Quadrature modulation and demodulation
Design Object : By implementing Quadrature modulation and demodulation of analog signals in digital signal processing, students will have better understanding of sampling and frequency analysis of discrete-time signals.
Design Content : Make a MATLAB function which performs Quadrature modulation and demodulation for a input signal with anti-aliasing filtering.
Abstract: A digital RF modulator, an integrated solution that satisfies stringent DOCSIS RF-performancerequirements, takes advantage of modern technologies like high-performance wideband digital-to-analogconversion and CMOS technology scaling. This application note describes the concept and advantages ofa digital Quadrature amplitude modulation (QAM) modulator that uses the direct-RF architecture to enablea cable access platform (CCAP) system.
特點(diǎn) 最高輸入頻率 10KHz 計(jì)數(shù)速度 50/10000脈波/秒可選擇 四種輸入模式可選擇(加算,減算,加減算,90度相位差加減算) 90度相位差加減算具有提高解析度4倍功能 輸入脈波具有預(yù)設(shè)刻度功能 計(jì)數(shù)暫時(shí)停止功能 3組報(bào)警功能 15BIT類比輸出功能 數(shù)位RS-485界面 2:主要規(guī)格 脈波輸入型式: Jump-pin selectable current sourcing(NPN) or current sinking (PNP) 脈波觸發(fā)電位: HI bias (CMOS) (VIH=7.5V, VIL=5.5V) LO bias (TTL) (VIH=3.7V, VIL=2.0V) 最高輸入頻率: <10KHz (up,down,up/down mode) <3KHz (Quadrature mode) 輸出動(dòng)作時(shí)間 : 0.1 to 99.9 second adjustable 輸出復(fù)歸方式: Manual(N) or automatic (R or C) can be modif 繼電器容量: AC 250V-5A, DC 30V-7A 顯示值范圍: -199999 to 999999 類比輸出解析度: 15 bit DAC 輸出反應(yīng)速度: < 1/f+10ms(0-90%) 輸出負(fù)載能力: < 10mA for voltage mode < 10V for current mode <[(V+)-7.5V]/20mA for two-wire mode 輸出之漣波: < 0.1% F.S. 通訊位址: "01"-"FF" 傳輸速度: 19200/9600/4800/2400 selective 通信協(xié)議: Modbus RTU mode 顯示幕: Red high efficiency LEDs high 14.22mm (.56") 參數(shù)設(shè)定方式: Touch switches 感應(yīng)器電源: 12VDC +/-3%(<60mA) 記憶方式: Non-volatile E2PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 1600Vdc (input/output) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(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
特點(diǎn) 最高輸入頻率 10KHz 計(jì)數(shù)速度 50/10000脈波/秒可選擇 四種輸入模式可選擇(加算,減算,加減算,90度相位差加減算) 90度相位差加減算具有提高解析度4倍功能 輸入脈波具有預(yù)設(shè)刻度功能 前置量設(shè)定功能(二段設(shè)定)可選擇 數(shù)位化指撥設(shè)定操作簡(jiǎn)易 計(jì)數(shù)暫時(shí)停止功能 3組報(bào)警功能 2:主要規(guī)格 脈波輸入型式: Jump-pin selectable current sourcing(NPN) or current sinking (PNP) 脈波觸發(fā)電位: HI bias (CMOS) (VIH=7.5V, VIL=5.5V) LO bias (TTL) (VIH=3.7V, VIL=2.0V) 最高輸入頻率: <10KHz (up,down,up/down mode) <5KHz (Quadrature mode) 輸出動(dòng)作時(shí)間 : 0.1 to 99.9 second adjustable 輸出復(fù)歸方式: Manual(N) or automatic (R or C) can be modif 繼電器容量: AC 250V-5A, DC 30V-7A 顯示值范圍: -199999 to 999999 顯示幕: Red high efficiency LEDs high 9.2mm (.36") 參數(shù)設(shè)定方式: Touch switches 感應(yīng)器電源: 12VDC +/-3%(<60mA) ( 感應(yīng)器電源 ) 記憶方式: Non-volatile E2PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 1600Vdc (input/output) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(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
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.
