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Wien-Bridge振盪器 - Wikipedia

Wien-Bridge振盪器

维基百科,自由的百科全书

Wien-Bridge振盪器 利用電阻與電容作為迴授的震盪電路,工作頻率可達約幾MHz左右。將輸出接至一電阻(R3)與電容(C1)串聯之電抗(Xs)串接一電阻(R4)與電容(C2)並聯之電抗(Xp),再將Xp之電壓回授至輸入端,此方式稱為韋恩橋式震盪器或韋恩橋式震盪電路。

Xs = R4jXC1

X_p  = R_3 // j X_{C2} = {R_3 \cdot -jX_{C2} \over R_3 -jX_{C2}}

迴授電路如下:


\beta(s) = {X_p \over { X_s + X_p}  }

={ R_3 \cdot -jX_{C2} \over { (R_4 -j X_{c1}) \cdot (R_3 -jX_{C2}) + R_3 \cdot -jX_{C2} } }

={ R_3 X_{C2}  \over ( R_4 X_{C2} + R_3 X_{C1} +R_3 X_{C2}  ) +j(R_3 R_4 -X_{C1}X_{C2})}

利用巴克豪生準則,震盪時虛部為零,增益為1。

故虛部之R3R4XC1XC2 = 0
回路增益\beta A = { R_3 X_{C2}  \over ( R_4 X_{C2} + R_3 X_{C1} +R_3 X_{C2}  ) }\cdot A = 1

R3 = R4 = RXC1 = XC2 = X

\beta = {1 \over 3}

增益必須為 A = 3始可滿足振盪之要求。


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