§102共发射极组态 共发射极组态的电压增益 扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫扫 gr A △ ZL+Z oe 输出等效电路 z25+(+E r:>rc rtre 当>团1时,> A≈g, B b+(1+B)§10-2 共发射极组态 共发射极组态的电压增益 L oe L oe me be ce e Z Z Z Z g V V A 0 输出等效电路 gme0Vbe Zoe ZL Vce 当 rc >> |ZL|时,Zoe>> ZL L b e e me L Z r r A g Z 1 0 Z me oe be ce e g Z VV A L 0 b e 1 oe c c b e r r Z r r r r