第一次独立设计的5670＋6n6 DAC胆输出

Yifei1406

R44K 改1k 这样即使在前管满载时候（8MA）压降也不大于10v。这8MA是怎么得出来的？还有R6 使其在静态时候压降为供给电压的一半这是什么道理？谢谢

神使

前级供给的RC退耦电容有问题
R 44K太大啦
0.1的电容太小。
建议换
R44K 改1k 这样即使在前管满载时候（8MA）压降也不大于10v。

适当改改R6 使其在静态时候压降为供给电压的一半。

我觉得第二级电流太少了。减少R4静态电流在10MA时候线性比较好。[em06]

Yifei1406

<img src="attachments/dvbbs/2005-5/2005531154617732.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/2005531154617732.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Julien

神使

R3多余R5应该放到阴极加到R4里面
R7太大

Julien

小鬼头

Yifei1406

Julien

Yifei1406

相信对大家都很有帮助的!!

Julien

<img src="attachments/dvbbs/2005-6/20056713575388.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-6/20056713575388.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Yifei1406

<img src="attachments/dvbbs/2005-6/20056713354235.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-6/20056713354235.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Yifei1406

取工作点<img src="attachments/dvbbs/2005-6/200567133340336.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-6/200567133340336.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Julien

阴极输出器输出动态一般只和管压降，负载特性，阴极电位 有关
他的输出电压是跟随特性，就是说，输入和输出之间的压差在正常情况下一直是静态栅负
就是总是保持你取的－1V

Yifei1406

那就是说我取Ug=-1也够了?

神使

图片里的阴极电阻1K是不是太小了或太大了啊

Julien

阴极输出器是100%负反馈电路
他的动态范围在垫高电位的时候，近似等于0.4Vcc

Yifei1406

版主，采用抬高电位的方法，我算了一下，栅负压取－3V,但在这张图中Ua300,Ia最大不能超过5mA,最小不低于2mA,这样的话范围很小，Ug只能在-5V和-2.7V之间运动！！不能满足需要这怎么办啊！！白思不得其解！！<img src="attachments/dvbbs/2005-6/200566225044507.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-6/200566225044507.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

CHENYI041

老瓜壳

胜读十年