Ä£Äâµç·֮¶þ¼«¹Ü¿¼ÊÔÌâ¿â ÏÂÔØ±¾ÎÄ

D 2V + R Vo1 _ 2V D + R Vo2

_ 2V R D 2V + Vo3 _ (a) (b) (c) R D 2V + Vo4 _ D 2V + R Vo5 2V _ D 2V + R Vo6 2V _ 2V (d) (e) (f)

ͼP6.10

½â£ºVO1¡Ö1.3V£¬VO2£½0£¬VO3¡Ö£­1.3V£¬VO4¡Ö2V£¬VO5¡Ö1.3V£¬

VO6¡Ö£­2V¡£

6.11 µç·ÈçͼP6.11Ëùʾ£¬¶þ¼«¹Üµ¼Í¨µçѹVD£½0.7V£¬³£ÎÂÏÂVT¡Ö26mV£¬µçÈÝC¶Ô½»Á÷ÐźſÉÊÓΪ¶Ì·£»viΪÕýÏÒ²¨£¬ÓÐЧֵΪ10mV¡£ÊÔÎʶþ¼«¹ÜÖÐÁ÷¹ýµÄ½»Á÷µçÁ÷ÓÐЧֵΪ¶àÉÙ£¿

+ vi _ C R 500

+ 2V _ D iD

½â£º¶þ¼«¹ÜµÄÖ±Á÷µçÁ÷

ID£½£¨V£­UD£©/R£½2.6mA

Æä¶¯Ì¬µç×è

rD¡ÖUT/ID£½10¦¸ ¹Ê¶¯Ì¬µçÁ÷ÓÐЧֵ

Id£½Ui/rD¡Ö1mA

6.12ÏÖÓÐÁ½Ö»ÎÈѹ¹Ü£¬ËüÃǵÄÎȶ¨µçѹ·Ö±ðΪ6VºÍ8V£¬ÕýÏòµ¼Í¨µçѹΪ0.7V¡£ÊÔÎÊ£º £¨1£©Èô½«ËüÃÇ´®ÁªÏà½Ó£¬Ôò¿ÉµÃµ½¼¸ÖÖÎÈѹֵ£¿¸÷Ϊ¶àÉÙ£¿ £¨2£©Èô½«ËüÃDz¢ÁªÏà½Ó£¬ÔòÓֿɵõ½¼¸ÖÖÎÈѹֵ£¿¸÷Ϊ¶àÉÙ£¿ ½â£º£¨1£©Á½Ö»ÎÈѹ¹Ü´®ÁªÊ±¿ÉµÃ1.4V¡¢6.7V¡¢8.7VºÍ14VµÈËÄÖÖÎÈѹֵ¡£

£¨2£©Á½Ö»ÎÈѹ¹Ü²¢ÁªÊ±¿ÉµÃ0.7VºÍ6VµÈÁ½ÖÖÎÈѹֵ¡£

6.13 ÒÑÖªÎÈѹ¹ÜµÄÎÈѹֵVZ£½6V£¬Îȶ¨µçÁ÷µÄ×îСֵIZmin£½5mA¡£ÇóͼP6.13Ëùʾµç·ÖÐVO1ºÍVO2¸÷Ϊ¶àÉÙ·ü¡£

R R + 10V _ 500¦¸ DZ +

RL 2k¦¸ V o1

+ 10V _ 2k¦¸ DZ +

RL 2k¦¸ V o2

_ _

(a) (b)

ͼP6.13

½â£ºVO1£½6V£¬VO2£½5V¡£

6.14ÒÑÖªÎÈѹ¹ÜµÄÎȶ¨µçѹVZ£½6V£¬Îȶ¨µçÁ÷µÄ×îСֵIZmin£½5mA£¬×î´ó¹¦ºÄPZM£½150mW¡£ÊÔÇóͼP6.14Ëùʾµç·Öеç×èRµÄȡֵ·¶Î§¡£ ½â£ºÎÈѹ¹ÜµÄ×î´óÎȶ¨µçÁ÷ IZM£½PZM/UZ£½25mA

µç×èRµÄµçÁ÷ΪIZM¡«IZmin£¬ËùÒÔÆäȡֵ·¶Î§Îª R?UI?UZ?0.36¡«1.8k? IZ+ DZ R + VI=15V _ Vo=6V _ ͼP6.14

6.15 ÒÑ֪ͼP6.15Ëùʾµç·ÖÐÎÈѹ¹ÜµÄÎȶ¨µçѹUZ£½6V£¬×îСÎȶ¨µçÁ÷IZmin£½5mA£¬×î´óÎȶ¨µçÁ÷IZmax£½25mA¡£

£¨1£©·Ö±ð¼ÆËãUIΪ10V¡¢15V¡¢35VÈýÖÖÇé¿öÏÂÊä³öµçѹUOµÄÖµ£» £¨2£©ÈôVI£½35Vʱ¸ºÔØ¿ªÂ·£¬Ôò»á³öÏÖʲôÏÖÏó?Ϊʲô£¿

½â£º£¨1£©µ±UI£½10Vʱ£¬ÈôUO£½UZ£½6V£¬ÔòÎÈѹ¹ÜµÄµçÁ÷Ϊ4mA£¬Ð¡ÓÚÆä×îСÎȶ¨µçÁ÷£¬ËùÒÔÎÈѹ¹Üδ»÷´©¡£¹Ê UO?RL?UI?3.33V

R?RL

µ±UI£½15Vʱ£¬ UO?RL?UI?5V£¬ ûÓб»»÷´©¡£

R?RL UO£½5V ͬÀí£¬µ±UI£½35Vʱ£¬UO£½UZ£½6V¡£

£¨2£©IDZ?(UI?UZ)R?29mA£¾IZM£½25mA£¬ÎÈѹ¹Ü½«Òò¹¦ºÄ¹ý´ó¶øË𻵡£

R R + VI _ 1k¦¸ DZ +

RL 500¦¸ V o

100¦¸ IZ +

RL Vo

_

10V DZ _

6.16ÒÑÖªÎÈѹ¶þ¼«¹ÜVZ=6V£¬PZ=0.12w£¬IZmin=2mA£¬µ±ÒªÇóRLÁ½¶ËµçѹVoÎȶ¨ÔÚ6Vʱ£¬ÇóRLµÄ±ä»¯·¶Î§¡£Èô³¬³öÕâ¸ö·¶Î§£¬µç·½«³öÏÖʲôÇé¿ö£¿

6.17µç·ÈçͼP6.17£¨a£©¡¢£¨b£©Ëùʾ£¬ÎÈѹ¹ÜµÄÎȶ¨µçѹVZ£½3V£¬RµÄȡֵºÏÊÊ£¬vIµÄ²¨ÐÎÈçͼ£¨c£©Ëùʾ¡£ÊԷֱ𻭳övO1ºÍvO2µÄ²¨ÐΡ£

R ͼP6.15

ͼP6.16

+ vI _ DZ + R vo1

+ vI _ DZ + vo2 _

vi(t)/V 6

_ ͼP6.17

½â£º²¨ÐÎÈç½âͼP6.17Ëùʾ

0

t

½âͼP6.17

½â£º??????RL?300??

??

¾§Ìå¶þ¼«¹Ü¼°Ó¦Óõç·²âÊÔÌâ

Ò».Ñ¡ÔñÌâ(60·Ö)

1.Èçͼ1.1.1Ëùʾµç·ͼÖÐ,µ±µçÔ´V1=5Vʱ,²âµÃI=1mA¡£Èô°ÑµçÔ´µçѹµ÷µ½V1=10V£¬ÔòµçÁ÷µÄ´óС½«ÊÇ___¡£ A¡¢I=2mA B¡¢I<2mA C¡¢I>2mA

2.ͼ1.1.1ÖУ¬Éèµç·ÖÐV1=5±£³Ö²»±ä£¬µ±Î¶ÈΪ20¡ãCʱ£¬²âµÃ¶þ¼«¹ÜµÄµçѹVd=0.7V,µ±Î¶ÈÉÏÉýµ½40¡ãCʱ£¬ ÔòVdµÄ´óС½«ÊÇ___¡£ A¡¢Vd=0.7V B¡¢Vd>0.7V C¡¢Vd<0.7V

3.Èçͼ1.1.2ËùʾµÄµç·ÖУ¬ÒÑÖª¶þ¼«¹ÜµÄ·´Ïò»÷´©µçѹΪ20V, µ±V1=5V¡¢Î¶ÈΪ20¡ãCʱ,I=2uA¡£ÈôµçÔ´µçѹÔö´óµ½10V,ÔòµçÁ÷IԼΪ___¡£ A¡¢10uA B¡¢4uA C¡¢2uA D¡¢1uA

4.ÉÏÌâÖУ¬ÈôµçÔ´µçѹ±£³Ö5V²»±ä£¬Î¶ÈÓÉ20¡ãCϽµµ½10¡ãCʱ£¬ÔòµçÁ÷IԼΪ___¡£

A¡¢10uA B¡¢4uA C¡¢2 uA D¡¢1uA;

5.Èçͼ1.1.3Ëùʾµç·ÖУ¬D1-D3ΪÀíÏë¶þ¼«¹Ü£¬A¡¢B¡¢C°×³ãµÆÅݹ¦ÂÊÏàͬ£¬ÆäÖÐ×î°µµÄµÆÊÇ___¡£ A¡¢B B¡¢C C¡¢A