資源簡(jiǎn)介
題目要求要實(shí)現(xiàn)一個(gè)增益自動(dòng)控制放大器,改變放大器增益的方法有很多。
1.通過(guò)模擬開(kāi)關(guān)切換反饋電阻,從而改變放大倍數(shù)。
2.通過(guò)數(shù)字電位器改變反饋電阻改變?cè)鲆妗?3.通過(guò)乘法型DAC內(nèi)部的電阻網(wǎng)絡(luò)來(lái)改變反饋電阻從而改變?cè)鲆妗?方案1,2由于模擬開(kāi)關(guān)和數(shù)字電位器提供的阻值變化范圍較少,很難實(shí)現(xiàn)自動(dòng)增益的精確控制。
方案3,乘法型DAC內(nèi)部有豐富的電阻網(wǎng)絡(luò)可以供選擇,一個(gè)12位的DAC有4095個(gè)動(dòng)態(tài)范圍的電阻值可以選擇,能很好的滿足動(dòng)態(tài)范圍。程控放大器輸入,輸出用單片機(jī)內(nèi)部的A/D采樣在單片機(jī)內(nèi)部處理數(shù)據(jù)得到直流電壓值或者交流電壓的幅度,根據(jù)輸入確定放大倍數(shù),測(cè)輸出調(diào)整放大倍數(shù)當(dāng)穩(wěn)定。時(shí)根據(jù)輸入和輸出的值算出放大倍數(shù),Af=vout/vin。原理框圖如下:
代碼片段和文件信息
?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件?????267264??2013-05-03?21:05??湖南省電子設(shè)計(jì)大賽C題一等獎(jiǎng).doc
?????文件???????2729??2012-08-06?15:05??csdac7811\dac7811.dep
?????文件??????20124??2012-07-30?17:50??csdac7811\dac7811.ewd
?????文件??????50739??2012-08-04?21:12??csdac7811\dac7811.ewp
?????文件????????161??2012-07-30?17:49??csdac7811\dac7811.ewp.eww
?????文件??????21172??2012-08-06?14:59??csdac7811\Debug\Exe\dac7811.d43
?????文件??????15024??2012-07-24?21:52??csdac7811\Debug\Exe\tlv5618.d43
?????文件????????157??2012-08-06?14:59??csdac7811\Debug\Obj\dac7811.pbd
?????文件????????839??2012-08-05?18:39??csdac7811\Debug\Obj\EW4E.tmp.r43
?????文件???????7407??2012-08-06?14:59??csdac7811\Debug\Obj\main.r43
?????文件??????20523??2012-08-04?21:12??csdac7811\Debug\Obj\n5110.r43
?????文件????????115??2012-07-30?15:53??csdac7811\Debug\Obj\tlv5618.pbd
?????文件??????11299??2012-08-05?18:39??csdac7811\EW4D.tmp
?????文件??????????0??2012-08-05?18:38??csdac7811\EW4E.tmp
?????文件??????????0??2012-08-05?18:38??csdac7811\EW4E.tmp.c
?????文件???????1077??2012-08-06?14:59??csdac7811\main.c
?????文件???????5760??2012-08-04?21:12??csdac7811\n5110.c
?????文件???????1547??2012-08-04?21:12??csdac7811\n5110.h
?????文件??????????0??2012-08-06?14:59??csdac7811\path.txt
?????文件???????1013??2012-03-13?15:30??csdac7811\readme.txt
?????文件???????1253??2012-08-06?14:59??csdac7811\settings\dac7811.cspy.bat
?????文件???????4387??2012-08-06?15:05??csdac7811\settings\dac7811.dbgdt
?????文件???????1281??2012-08-06?15:05??csdac7811\settings\dac7811.dni
?????文件???????3342??2012-08-06?15:05??csdac7811\settings\dac7811.ewp.wsdt
?????文件???????1253??2012-07-30?17:32??csdac7811\settings\tlv5618.cspy.bat
?????文件???????4456??2012-07-30?17:32??csdac7811\settings\tlv5618.dbgdt
?????文件???????1280??2012-07-30?17:32??csdac7811\settings\tlv5618.dni
?????文件???????2725??2012-07-30?17:32??csdac7811\settings\tlv5618.ewp.wsdt
?????目錄??????????0??2015-10-20?19:56??csdac7811\Debug\Exe
?????目錄??????????0??2014-11-22?14:26??csdac7811\Debug\List
............此處省略7個(gè)文件信息
-----------?---------??----------?-----??----
?????文件?????267264??2013-05-03?21:05??湖南省電子設(shè)計(jì)大賽C題一等獎(jiǎng).doc
?????文件???????2729??2012-08-06?15:05??csdac7811\dac7811.dep
?????文件??????20124??2012-07-30?17:50??csdac7811\dac7811.ewd
?????文件??????50739??2012-08-04?21:12??csdac7811\dac7811.ewp
?????文件????????161??2012-07-30?17:49??csdac7811\dac7811.ewp.eww
?????文件??????21172??2012-08-06?14:59??csdac7811\Debug\Exe\dac7811.d43
?????文件??????15024??2012-07-24?21:52??csdac7811\Debug\Exe\tlv5618.d43
?????文件????????157??2012-08-06?14:59??csdac7811\Debug\Obj\dac7811.pbd
?????文件????????839??2012-08-05?18:39??csdac7811\Debug\Obj\EW4E.tmp.r43
?????文件???????7407??2012-08-06?14:59??csdac7811\Debug\Obj\main.r43
?????文件??????20523??2012-08-04?21:12??csdac7811\Debug\Obj\n5110.r43
?????文件????????115??2012-07-30?15:53??csdac7811\Debug\Obj\tlv5618.pbd
?????文件??????11299??2012-08-05?18:39??csdac7811\EW4D.tmp
?????文件??????????0??2012-08-05?18:38??csdac7811\EW4E.tmp
?????文件??????????0??2012-08-05?18:38??csdac7811\EW4E.tmp.c
?????文件???????1077??2012-08-06?14:59??csdac7811\main.c
?????文件???????5760??2012-08-04?21:12??csdac7811\n5110.c
?????文件???????1547??2012-08-04?21:12??csdac7811\n5110.h
?????文件??????????0??2012-08-06?14:59??csdac7811\path.txt
?????文件???????1013??2012-03-13?15:30??csdac7811\readme.txt
?????文件???????1253??2012-08-06?14:59??csdac7811\settings\dac7811.cspy.bat
?????文件???????4387??2012-08-06?15:05??csdac7811\settings\dac7811.dbgdt
?????文件???????1281??2012-08-06?15:05??csdac7811\settings\dac7811.dni
?????文件???????3342??2012-08-06?15:05??csdac7811\settings\dac7811.ewp.wsdt
?????文件???????1253??2012-07-30?17:32??csdac7811\settings\tlv5618.cspy.bat
?????文件???????4456??2012-07-30?17:32??csdac7811\settings\tlv5618.dbgdt
?????文件???????1280??2012-07-30?17:32??csdac7811\settings\tlv5618.dni
?????文件???????2725??2012-07-30?17:32??csdac7811\settings\tlv5618.ewp.wsdt
?????目錄??????????0??2015-10-20?19:56??csdac7811\Debug\Exe
?????目錄??????????0??2014-11-22?14:26??csdac7811\Debug\List
............此處省略7個(gè)文件信息
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