xlowen
New Member
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Posts: 9
Delft, Netherlands
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Dear All,
I built a 3rd order feedforward 1-bit DT sigma delta modulator in simulink with ideal integrator and quantizer. When I applied small input signal (-40dB), 2nd order distortion appears at the output spectrum as shown in attached fig. When I apply large input signal (-3dB), usually I can only see 3rd order distortion, which comes from the nonlinearity of 1-bit Qunatizer. Can anyone give some insight about why 2nd distortion shows up when small signal is applied?
[img][/img]
Thanks, xlowen
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