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Precision amplitude oscillator.

Discussion in 'Electronic Design' started by Michael Clarke, Jan 14, 2004.

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  1. Hi,
    I need a sinwave oscillator circuit with precision amplitude - about
    0.1% Also good temperature stability and resistance to supply voltage
    variation. It will be fixed frequency 10KHz aprox. Spectral purity is
    fairly important </= 5% harmonics . Frequency accuracy is not critical
    </= 5% would be fine. I could adapt a Wien bridge design using a FET as
    variable resistance to control gain, but having to incorporate a
    precision reference makes it complicated and messy. There is a
    uContreoller in the instrument, and I have thought about using a
    variable width pulse to excite the resonant circuit, but I expect the
    harmonic content would be high - and varies with pulse width. Could
    anyone suggest a clever way to go about it?
    Help appreciated.
     
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