一、基于單片機的信號發生器設計方案
信(xin)號(hao)發生器用于調節(jie)射頻(pin)匹配電路(lu)，可(ke)以(yi)自行(xing)設計，一般普通(tong)的信(xin)號(hao)發生器需(xu)要(yao)輸出正弦波(bo)、方(fang)波(bo)、三角波(bo)以(yi)及(ji)鋸(ju)齒波(bo)等信(xin)號(hao)，可(ke)通(tong)過按鍵調節(jie)信(xin)號(hao)的頻(pin)率以(yi)及(ji)信(xin)號(hao)的幅度，其具體的設計方(fang)案如下：
1、總體方案設計
信(xin)(xin)(xin)號(hao)(hao)發生(sheng)器發送出去的(de)(de)(de)是(shi)模(mo)擬(ni)(ni)信(xin)(xin)(xin)號(hao)(hao)，而(er)單(dan)片(pian)機輸出的(de)(de)(de)是(shi)數(shu)(shu)字信(xin)(xin)(xin)號(hao)(hao)，因此在(zai)(zai)設計(ji)信(xin)(xin)(xin)號(hao)(hao)發生(sheng)器系統時(shi)，需(xu)(xu)要使用到(dao)數(shu)(shu)模(mo)轉(zhuan)換芯片(pian)，可(ke)選擇數(shu)(shu)模(mo)轉(zhuan)換芯片(pian)DAC0832，然后再(zai)利用運算放大器將(jiang)DAC0832輸出的(de)(de)(de)電(dian)(dian)流信(xin)(xin)(xin)號(hao)(hao)轉(zhuan)換成(cheng)電(dian)(dian)壓信(xin)(xin)(xin)號(hao)(hao)。這(zhe)樣信(xin)(xin)(xin)號(hao)(hao)發生(sheng)器便(bian)輸出了模(mo)擬(ni)(ni)電(dian)(dian)壓。系統要輸出各種波(bo)形信(xin)(xin)(xin)號(hao)(hao)，則(ze)要求DAC0832在(zai)(zai)運放的(de)(de)(de)作(zuo)用下(xia)，在(zai)(zai)不(bu)同(tong)時(shi)間(jian)點輸出不(bu)同(tong)的(de)(de)(de)電(dian)(dian)壓值，再(zai)將(jiang)這(zhe)些電(dian)(dian)壓值連(lian)接起來，便(bian)構成(cheng)了相應的(de)(de)(de)波(bo)形信(xin)(xin)(xin)號(hao)(hao)。而(er)要得到(dao)不(bu)同(tong)的(de)(de)(de)電(dian)(dian)壓值，則(ze)單(dan)片(pian)機需(xu)(xu)要將(jiang)8位I/O口接到(dao)DAC0832芯片(pian)的(de)(de)(de)8位數(shu)(shu)據信(xin)(xin)(xin)號(hao)(hao)輸入端，單(dan)片(pian)機通(tong)過(guo)改(gai)變(bian)(bian)8位I/O口的(de)(de)(de)數(shu)(shu)字信(xin)(xin)(xin)號(hao)(hao)，便(bian)可(ke)以在(zai)(zai)DAC0832以及運放的(de)(de)(de)作(zuo)用下(xia)，得到(dao)不(bu)同(tong)的(de)(de)(de)電(dian)(dian)壓值，再(zai)在(zai)(zai)時(shi)間(jian)的(de)(de)(de)作(zuo)用下(xia)形成(cheng)不(bu)同(tong)的(de)(de)(de)波(bo)形信(xin)(xin)(xin)號(hao)(hao)。波(bo)形信(xin)(xin)(xin)號(hao)(hao)頻率的(de)(de)(de)的(de)(de)(de)變(bian)(bian)化可(ke)通(tong)過(guo)改(gai)變(bian)(bian)單(dan)片(pian)機8位I/O輸出口的(de)(de)(de)數(shu)(shu)據變(bian)(bian)化率來實現(xian)。
波(bo)形信(xin)號的(de)(de)幅(fu)度(du)(du)由DAC0832的(de)(de)參考電(dian)壓VREF來(lai)決定(ding)，為(wei)了確保VREF的(de)(de)大小可(ke)變(bian)，本系統(tong)使用(yong)到了芯(xin)片PCF8591，將PCF8591芯(xin)片的(de)(de)模(mo)(mo)擬(ni)電(dian)壓輸出(chu)(chu)端接(jie)在DAC0832的(de)(de)VREF上，通過改變(bian)PCF8591模(mo)(mo)擬(ni)電(dian)壓輸出(chu)(chu)值便(bian)可(ke)改變(bian)VREF值，從而改變(bian)波(bo)形信(xin)號的(de)(de)幅(fu)度(du)(du)值。而PCF8591的(de)(de)模(mo)(mo)擬(ni)電(dian)壓輸出(chu)(chu)值則(ze)是尤(you)其I2C總行(xing)上的(de)(de)數據所決定(ding)，利用(yong)單(dan)片機的(de)(de)I/O口模(mo)(mo)擬(ni)I2C與(yu)PCF8591進行(xing)通信(xin)，那(nei)么單(dan)片機便(bian)可(ke)通過I/O口控(kong)制VREF電(dian)壓的(de)(de)變(bian)化(hua)，從而控(kong)制波(bo)形的(de)(de)幅(fu)度(du)(du)變(bian)化(hua)。
2、系統硬件設計
（1）晶振電路設計
單片(pian)機穩(wen)(wen)定工作則需(xu)要(yao)穩(wen)(wen)定的(de)(de)(de)(de)時(shi)鐘(zhong)(zhong)信號(hao)(hao)，而(er)時(shi)鐘(zhong)(zhong)信號(hao)(hao)則是由(you)晶(jing)(jing)(jing)(jing)(jing)振(zhen)(zhen)(zhen)電(dian)(dian)路產生，因此(ci)晶(jing)(jing)(jing)(jing)(jing)振(zhen)(zhen)(zhen)電(dian)(dian)路設計(ji)的(de)(de)(de)(de)好壞直接影響到(dao)最小系統(tong)的(de)(de)(de)(de)穩(wen)(wen)定性。單片(pian)機的(de)(de)(de)(de)18腳(jiao)和19腳(jiao)為晶(jing)(jing)(jing)(jing)(jing)振(zhen)(zhen)(zhen)連接輸(shu)入腳(jiao)，將晶(jing)(jing)(jing)(jing)(jing)振(zhen)(zhen)(zhen)X1的(de)(de)(de)(de)兩(liang)端(duan)連接到(dao)單片(pian)機18和19腳(jiao)之(zhi)后便會(hui)產生時(shi)鐘(zhong)(zhong)信號(hao)(hao)，此(ci)時(shi)的(de)(de)(de)(de)信號(hao)(hao)會(hui)存(cun)在不(bu)穩(wen)(wen)定的(de)(de)(de)(de)問題(ti)，需(xu)要(yao)在晶(jing)(jing)(jing)(jing)(jing)振(zhen)(zhen)(zhen)Y1的(de)(de)(de)(de)兩(liang)端(duan)分別外接一個22PF電(dian)(dian)容(rong)C1、C2到(dao)GND，該電(dian)(dian)容(rong)為晶(jing)(jing)(jing)(jing)(jing)振(zhen)(zhen)(zhen)的(de)(de)(de)(de)匹配(pei)電(dian)(dian)容(rong)，晶(jing)(jing)(jing)(jing)(jing)振(zhen)(zhen)(zhen)匹配(pei)了(le)電(dian)(dian)容(rong)之(zhi)后，那么(me)產生的(de)(de)(de)(de)時(shi)鐘(zhong)(zhong)信號(hao)(hao)就比較穩(wen)(wen)定。出(chu)現的(de)(de)(de)(de)頻偏也是在20PPM的(de)(de)(de)(de)范(fan)圍內。這樣(yang)才(cai)能確保(bao)系統(tong)時(shi)鐘(zhong)(zhong)穩(wen)(wen)定可(ke)靠。
（2）復位電路設計
最小系(xi)統(tong)(tong)除了晶振電路之外(wai)，還(huan)需要具備復(fu)位(wei)電路，單片機上電后(hou)，啟(qi)動的(de)時候，需要復(fu)位(wei)電路先進(jin)行(xing)復(fu)位(wei)，確保系(xi)統(tong)(tong)運(yun)行(xing)的(de)起始(shi)地址一致 ，保證(zheng)系(xi)統(tong)(tong)工作(zuo)的(de)穩定性，復(fu)位(wei)是利(li)用電容C3與R1來實現(xian)的(de)。
（3）波形幅度調節電路設計
為(wei)改變系(xi)統輸(shu)出的(de)(de)波形幅度(du)(du)值(zhi)，本系(xi)統使用(yong)到(dao)了PCF8591芯片，該(gai)(gai)芯片是一個8位CMOS數據(ju)采集器，該(gai)(gai)芯片可以(yi)(yi)將(jiang)(jiang)模(mo)擬信(xin)號(hao)轉換(huan)成數字信(xin)號(hao)，再(zai)通過(guo)I2C數據(ju)總線(xian)將(jiang)(jiang)該(gai)(gai)數字信(xin)號(hao)發(fa)送給單片機；也可以(yi)(yi)反過(guo)來，單片機通過(guo)I2C總線(xian)將(jiang)(jiang)數字信(xin)號(hao)發(fa)送給PCF8591芯片，再(zai)由該(gai)(gai)芯片進(jin)行數模(mo)轉換(huan)后，變成模(mo)擬電壓再(zai)由AOUT腳輸(shu)出。利用(yong)這(zhe)一原理，本系(xi)統為(wei)了調節信(xin)號(hao)發(fa)生器的(de)(de)幅度(du)(du)值(zhi)，將(jiang)(jiang)單片機P2.0和P2.1模(mo)擬I2C與PCF8591通信(xin)，這(zhe)樣單片機便可以(yi)(yi)控(kong)制(zhi)PCF8591的(de)(de)AOUT輸(shu)出端模(mo)擬電壓的(de)(de)大(da)小，再(zai)將(jiang)(jiang)其接入到(dao)DAC0832的(de)(de)VREF腳上，便可以(yi)(yi)控(kong)制(zhi)波形的(de)(de)幅度(du)(du)。
（4）數模轉換電路設計
信(xin)號(hao)發生(sheng)器(qi)產生(sheng)各種波(bo)形(xing)(xing)信(xin)號(hao)使(shi)用(yong)到了DAC0832數模(mo)轉換芯片(pian)(pian)，該芯片(pian)(pian)內(nei)部(bu)集成(cheng)了一(yi)(yi)個8位D/A轉換器(qi)，一(yi)(yi)個8為DAC寄(ji)存(cun)器(qi)，一(yi)(yi)個8位輸(shu)入寄(ji)存(cun)器(qi)以及一(yi)(yi)個控制電路，其(qi)內(nei)部(bu)采用(yong)的(de)是(shi)倒T型R-2R電阻網絡，將該數模(mo)轉換芯片(pian)(pian)與運算放(fang)大器(qi)LM358一(yi)(yi)起使(shi)用(yong)，便可以使(shi)運放(fang)輸(shu)出(chu)(chu)端有28 =256個電壓(ya)值輸(shu)出(chu)(chu)。在不(bu)同(tong)時間內(nei)變(bian)換輸(shu)出(chu)(chu)不(bu)同(tong)的(de)電壓(ya)值，使(shi)其(qi)產生(sheng)周期性的(de)變(bian)化便能形(xing)(xing)成(cheng)相應的(de)波(bo)形(xing)(xing)信(xin)號(hao)。
（5）按鍵中斷控制電路設計
基于單(dan)片機的信號(hao)發生器要求輸出方(fang)波(bo)(bo)、三(san)角波(bo)(bo)、鋸齒波(bo)(bo)以及正弦波(bo)(bo)信號(hao)，信號(hao)的幅(fu)度(du)和頻(pin)(pin)率(lv)可調，用戶可通(tong)過系(xi)統(tong)(tong)按鍵(jian)(jian)來對信號(hao)發生器進行(xing)設(she)置(zhi)。在系(xi)統(tong)(tong)中，設(she)計了(le)8個按鍵(jian)(jian)，其(qi)功(gong)(gong)能分別為(wei)100HZ頻(pin)(pin)率(lv)加(jia)按鍵(jian)(jian)、1hz頻(pin)(pin)率(lv)加(jia)按鍵(jian)(jian)、-1hz頻(pin)(pin)率(lv)減按鍵(jian)(jian)、1V電(dian)壓幅(fu)度(du)加(jia)按鍵(jian)(jian)、0.1V電(dian)壓幅(fu)度(du)加(jia)按鍵(jian)(jian)、-0.1V電(dian)壓幅(fu)度(du)減按鍵(jian)(jian)、波(bo)(bo)形切換按鍵(jian)(jian)、掃頻(pin)(pin)開關按鍵(jian)(jian)。為(wei)了(le)方(fang)便系(xi)統(tong)(tong)設(she)計，采用獨立按鍵(jian)(jian)設(she)計方(fang)法，利用單(dan)片機P1口(kou)將各按鍵(jian)(jian)連接，通(tong)過軟件將P1口(kou)設(she)置(zhi)成上(shang)拉狀態。當(dang)沒有按鍵(jian)(jian)按下(xia)時，單(dan)片機P1口(kou)中的所有I/O口(kou)檢測(ce)的到時高電(dian)平；當(dang)有按鍵(jian)(jian)按下(xia)時，則該(gai)按鍵(jian)(jian)對應單(dan)片機的I/O口(kou)會被拉低，變成低電(dian)平。單(dan)片機便能檢測(ce)到，從而調用該(gai)按鍵(jian)(jian)程序(xu)執行(xing)相應的功(gong)(gong)能。
（6）電源電路設計
本系統電(dian)(dian)路設(she)計是(shi)在Proteus仿真軟件上(shang)設(she)計，該仿真軟件有(you)各種電(dian)(dian)源，可直(zhi)(zhi)接調(diao)用(yong)。無需使(shi)用(yong)電(dian)(dian)壓轉換(huan)芯片。在本系統單(dan)片機使(shi)用(yong)5V電(dian)(dian)壓供電(dian)(dian)，而為了使(shi)輸(shu)出波形幅度為10V，則PCF8591采(cai)用(yong)10V電(dian)(dian)壓供電(dian)(dian)，而運算(suan)放大(da)器采(cai)用(yong)±15V供電(dian)(dian)，直(zhi)(zhi)接從仿真軟件上(shang)取電(dian)(dian)源即(ji)可。
3、系統軟件設計
完成proteus軟件(jian)電路(lu)圖設計之后(hou)(hou)，接下來需(xu)要(yao)對單片機編(bian)寫(xie)驅(qu)動程(cheng)序，系統(tong)驅(qu)動程(cheng)序的編(bian)寫(xie)是(shi)在keil軟件(jian)平臺上完成的，Keil軟件(jian)打(da)開后(hou)(hou)，要(yao)先(xian)建立(li)工(gong)程(cheng)，然(ran)后(hou)(hou)在工(gong)程(cheng)當中(zhong)建立(li)一個.c文(wen)件(jian)，在此文(wen)件(jian)中(zhong)編(bian)寫(xie)代碼驅(qu)動程(cheng)序：
（1）系統主程序設計
主(zhu)(zhu)程(cheng)(cheng)(cheng)序(xu)(xu)是軟件(jian)系(xi)(xi)(xi)統(tong)(tong)中(zhong)最為(wei)重(zhong)要的(de)(de)(de)程(cheng)(cheng)(cheng)序(xu)(xu)，因為(wei)系(xi)(xi)(xi)統(tong)(tong)程(cheng)(cheng)(cheng)序(xu)(xu)是由各個(ge)子程(cheng)(cheng)(cheng)序(xu)(xu)所構(gou)成，而子程(cheng)(cheng)(cheng)序(xu)(xu)的(de)(de)(de)調用全(quan)部是在主(zhu)(zhu)程(cheng)(cheng)(cheng)序(xu)(xu)中(zhong)來實現的(de)(de)(de)，主(zhu)(zhu)程(cheng)(cheng)(cheng)序(xu)(xu)設計的(de)(de)(de)好壞直接能影(ying)響到(dao)系(xi)(xi)(xi)統(tong)(tong)的(de)(de)(de)邏輯結構(gou)，影(ying)響到(dao)系(xi)(xi)(xi)統(tong)(tong)工(gong)作(zuo)的(de)(de)(de)穩定性。在本系(xi)(xi)(xi)統(tong)(tong)中(zhong)，系(xi)(xi)(xi)統(tong)(tong)開始運(yun)行后(hou)，先會(hui)執行主(zhu)(zhu)程(cheng)(cheng)(cheng)序(xu)(xu)，在主(zhu)(zhu)程(cheng)(cheng)(cheng)序(xu)(xu)中(zhong)對單片(pian)機(ji)及其(qi)外圍元件(jian)進行初(chu)始化(hua)設置，完(wan)成初(chu)始化(hua)設置之后(hou)，系(xi)(xi)(xi)統(tong)(tong)就會(hui)執行正弦波(bo)程(cheng)(cheng)(cheng)序(xu)(xu)，讓信號發生(sheng)器輸出正弦波(bo)信號，然后(hou)再去檢(jian)測是否(fou)有(you)按(an)鍵(jian)按(an)下，如(ru)果(guo)有(you)按(an)鍵(jian)按(an)下，系(xi)(xi)(xi)統(tong)(tong)檢(jian)測到(dao)后(hou)，便會(hui)執行相應按(an)鍵(jian)的(de)(de)(de)程(cheng)(cheng)(cheng)序(xu)(xu)，從而改(gai)變(bian)信號發生(sheng)器輸出的(de)(de)(de)波(bo)形(xing)。如(ru)果(guo)沒有(you)按(an)鍵(jian)產(chan)生(sheng)，則系(xi)(xi)(xi)統(tong)(tong)繼(ji)續(xu)保持當(dang)前波(bo)形(xing)輸出，然后(hou)再繼(ji)續(xu)去訪問是否(fou)有(you)按(an)鍵(jian)按(an)下，如(ru)此循環下去。
（2）按鍵掃描程序設計
本系統是通(tong)過按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)來改變信號發(fa)生器的(de)波(bo)(bo)形(xing)，系統一共(gong)有八個按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，按(an)(an)(an)(an)下不同(tong)按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)時(shi)，系統需要輸(shu)(shu)出(chu)(chu)不同(tong)的(de)波(bo)(bo)形(xing)。定(ding)義按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)6為(wei)(wei)波(bo)(bo)形(xing)切(qie)換按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)0為(wei)(wei)100HZ頻率增加按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)1為(wei)(wei)1HZ頻率增加按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)2為(wei)(wei)1HZ頻率減(jian)按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)3位(wei)1V幅度(du)增加按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)4為(wei)(wei)0.1V幅度(du)增加按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)5為(wei)(wei)0.1V幅度(du)減(jian)小(xiao)按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)7位(wei)掃頻按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)，flang為(wei)(wei)標志位(wei)，用于判斷按(an)(an)(an)(an)鍵(jian)(jian)(jian)(jian)6按(an)(an)(an)(an)下的(de)次(ci)數當(dang)flang為(wei)(wei)1是默認輸(shu)(shu)出(chu)(chu)正弦波(bo)(bo)；當(dang)flang為(wei)(wei)2時(shi)，輸(shu)(shu)出(chu)(chu)三(san)角波(bo)(bo)；當(dang)flang為(wei)(wei)3時(shi)輸(shu)(shu)出(chu)(chu)鋸齒(chi)波(bo)(bo)；當(dang)flang為(wei)(wei)4時(shi)，輸(shu)(shu)出(chu)(chu)方(fang)波(bo)(bo)；當(dang)flang為(wei)(wei)5時(shi)，則會令flang=1，輸(shu)(shu)出(chu)(chu)正弦波(bo)(bo)。
因此，當(dang)(dang)(dang)有按(an)(an)(an)(an)鍵(jian)按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)時，系(xi)統(tong)調用按(an)(an)(an)(an)鍵(jian)程序(xu)(xu)會(hui)去判斷(duan)是(shi)哪(na)個按(an)(an)(an)(an)鍵(jian)按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)，如果是(shi)按(an)(an)(an)(an)鍵(jian)6按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)，表示(shi)需要切換信(xin)號發生器的(de)輸(shu)出波(bo)形，令(ling)flang+1，然后判斷(duan)flang的(de)值，再輸(shu)出相應的(de)波(bo)形信(xin)號。當(dang)(dang)(dang)是(shi)0按(an)(an)(an)(an)鍵(jian)按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)時，則(ze)(ze)系(xi)統(tong)會(hui)在(zai)原(yuan)有的(de)波(bo)形上，改(gai)變(bian)其輸(shu)出頻率，使頻率增(zeng)(zeng)(zeng)加(jia)100HZ；當(dang)(dang)(dang)按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)的(de)是(shi)1按(an)(an)(an)(an)鍵(jian)，則(ze)(ze)將頻率增(zeng)(zeng)(zeng)加(jia)1HZ；當(dang)(dang)(dang)2按(an)(an)(an)(an)鍵(jian)按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)，則(ze)(ze)將頻率減小(xiao)1HZ；當(dang)(dang)(dang)按(an)(an)(an)(an)鍵(jian)3按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)時，表示(shi)要在(zai)原(yuan)有波(bo)形的(de)基礎上增(zeng)(zeng)(zeng)加(jia)1V的(de)波(bo)形幅度(du)；當(dang)(dang)(dang)4按(an)(an)(an)(an)鍵(jian)按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)，則(ze)(ze)幅度(du)增(zeng)(zeng)(zeng)加(jia)0.1V；當(dang)(dang)(dang)5按(an)(an)(an)(an)鍵(jian)按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)，則(ze)(ze)幅度(du)減小(xiao)0.1V；當(dang)(dang)(dang)7按(an)(an)(an)(an)鍵(jian)按(an)(an)(an)(an)下(xia)(xia)(xia)(xia)(xia)(xia)，則(ze)(ze)進行(xing)掃頻。當(dang)(dang)(dang)執行(xing)完按(an)(an)(an)(an)鍵(jian)程序(xu)(xu)后，返回系(xi)統(tong)主程序(xu)(xu)。
二、信號發生器的設計要求有哪些
基于單片機設計的信號發生器屬于簡易信號發生器，主要能產生方波、三角波和正弦波并進行仿真，這類信號發生器設計好(hao)后，應滿足以下要(yao)求：
1、基本性能指標要求
（1）頻率范圍：100Hz~1kHz。
（2）輸出電(dian)壓：方波 Up-p≤24V，三(san)角波 Up-p=6V，正弦波 Up-p>1V。
2、擴展性能指標要求
頻(pin)率(lv)范(fan)圍分段設置10Hz~100Hz，100Hz~1kHz，1kHz~10kHz；波(bo)形特性方(fang)波(bo)t r<30us（1kHz，最大輸出時(shi)），三角波(bo)r△<2%，正弦波(bo)r～<5%。
