Dear sduphz, In the high state, the voltage (collector-to-emitter) across the driving transitor is (Vcc-VH), while the current flowing out through the load to VT is (VH-VT)/R. In the low state, the voltage (collector-to-emitter) across the driving transitor is (Vcc-VL), while the current flowing out through the load to VT is (VL-VT)/R. The formula expresses the average of these two values (that's the "equal probability of ones or zeros" assumption). Best regards, Dr. Howard Johnson, Signal Consulting Inc., tel +1 509-997-0505, howie03@xxxxxxxxxx http:\\sigcon.com -- High-Speed Digital Design seminars, books, and articles -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of ³¯»Ô Åí Sent: Tuesday, October 26, 2004 3:01 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] question about caculation the emitter follower output quiescent power hello everyone, i am learning Howard's <the high speed digital design>. there is a question,in the chapter 2 and page 51, why the emitter follower output quiescent power is P={(Vcc-Vh)(Vh-Vt)+(Vcc-Vl)(Vl-Vt)}/(2R). thanks. sdupzh --------------------------------- Do You Yahoo!? 150ÍòÇúMP3·è¿ñËÑ£¬´øÄú´³ÈëÒôÀÖµîÌà ÃÀÅ®Ã÷ÐÇÓ¦Óо¡ÓУ¬ËѱéÃÀͼ¡¢ÑÞͼºÍ¿áͼ 1G¾ÍÊÇ1000Õ×£¬ÑÅ»¢µçÓÊ×ÔÖúÀ©ÈÝ£¡ ------------------------------------------------------------ ------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu