文氏电桥




文氏电桥(英语:Wien bridge oscillator)是利用电阻与电容作为回授的一种电桥型振荡器,工作频率可达约几MHz左右。将输出接至一电阻()与电容(
)串联之电抗(
)串接一电阻(
)与电容(
)并联之电抗(
),再将
之电压回授至输入端,此方式称为韦恩桥式震荡器或韦恩桥式震荡电路。
回授电路如下:
利用巴克豪生准则,震荡时虚部为零,增益为1。
- 故虚部之
;
- 回路增益
若;
增益必须为 始可满足振荡之要求。
单词 | Wien bridge oscillator |
释义 |
Wien bridge oscillator
中文百科
文氏电桥![]() ![]() ![]() ![]() 文氏电桥(英语:Wien bridge oscillator)是利用电阻与电容作为回授的一种电桥型振荡器,工作频率可达约几MHz左右。将输出接至一电阻( 回授电路如下: 利用巴克豪生准则,震荡时虚部为零,增益为1。
若 增益必须为
英语百科
Wien bridge oscillator 文氏电桥![]() ![]() ![]() ![]() A Wien bridge oscillator is a type of electronic oscillator that generates sine waves. It can generate a large range of frequencies. The oscillator is based on a bridge circuit originally developed by Max Wien in 1891 for the measurement of impedances. The bridge comprises four resistors and two capacitors. The oscillator can also be viewed as a positive gain amplifier combined with a bandpass filter that provides positive feedback. Automatic gain control, intentional non-linearity and incidental non-linearity limit the output amplitude in various implementations of the oscillator. |
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