Wien-Bridge Oscillator

  
The HA2541 is well-suited for use as the heart of an oscillator. In spite of the rudimentary diode limiting that is
Wien-Bridge Oscillator - schematic

provided by R3 through R7 and D1 and D2, a good-quality sine wave of 40 MHz is readily attainable with an upper limit of 50 MHz, which exceeds the unity-gain bandwidth of HA-2541. Rl/Cl and R2/C2 provide the required regenerative feedback needed for adequate frequency stability. In theory, the feedback network requires a gain of three to sustain oscillation. However, the practical gain needed is just over three and is provided by R8 and R9.




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