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RC bridge oscillator circuit

2016-05-15 21:51  
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RC bridge oscillator circuit
RC bridge oscillator circuit is just as shown in the figure. RC series-parallel network is connected to the output end and inverting input end of op-amp, aiming to form a positive feedback network with a frequency selective function. Besides, Rf and R1 are set within the op-amp's input end and its inverting input end. An integrated operational amplifier is connected with previous circuit to form a negative feedback amplifier circuit. According to the following figure, the positive feedback circuit and negative feedback circuit form a Wien bridge circuit. And input and output terminals of the op-amp are connected across the bridge respectively. Therefore, this oscillation circuit is called RC bridge oscillator circuit.