幅频特性 Ux(n) U 1+o+ 0.707 Q=0.5 0-1 Q-10 0 n1 1 n2 m 0070：8 U,√2 02>01 0 Q越大，谐振曲线越尖。通频带越窄，选择性越好。Q䎺བྷˈ䉀ᥟᴢ㓯䎺ቆDŽ䙊仁ᑖ䎺ゴˈ䘹ᤙᙗ䎺ྭDŽ 0.707 Q=1 Q=0.5 Q=10 1 K2 K1 ( ) R s U Ș U 0 K ᑵ仁⢩ᙗ , , . 2 1 0 2 2 0 1 1 Ȧ Ȧ Ȧ Ȧ Ș Ȧ Ȧ Ș ! () 1 0.707 2 R s U jȘ U 2 2 1 1 1( ) Q K K