OPA547F Waveform Generator

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5.6v zenners forward biased 🙂

Hi All,

Using the 5.6v zenners greatly improved temperature stability, there is only slight amplitude variation of a couple of percent between 0 deg C and 40 deg C.

BUT this high level of clamping resulted in very distorted output, with extra noise due to the reverse biased junctions.

So to fix this I placed the 5.6v Zenners in the circuit as forward biased, this reduced the clamping voltage and noise while retaining the temperature stability.
 
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