39 如圖振盪電路，U1為理想運算放大器，假設二極體導通電壓 VD0 = 0.7 V。已知 V = 15 V、R1 = 10 kΩ、Rf = 20.3 kΩ、R2 =3 kΩ、R3=1 kΩ、R4 = 1 kΩ、R5 = 3 kΩ。在放大器 U1 正端輸入設有一回授網路，其中 CS = 16 nF、RS = 5 kΩ、CP = 16 nF、RP = 5 kΩ。試求此電路輸出振盪電壓的峰對峰值（peak-to-peak value）約為多少？ 
(A)6 V
(B)11 V
(C)16 V
(D)21 V