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The 3-rd order continuous-time sigma-delta ADC

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kuohsi

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I have studied continuous-time sigma-delta A/D converter.

The loop filter is implemented by GM-C filter, the structure is adapted with source degeneration.

I have used 3-rd order loop filter. The 1-st GM gain is 45dB ,p.m is 89 deg.



The output FFT diagram is shown below

**broken link removed**

What is the question of the 3-rd tone(harmonic-distortion)very large??

thanks!!:D
 

moreover, the quantizer is single bit, DAC is single,too.
 

can you post your architecture of integrator???
I guess your Vgst of source current is too small.

MSN:baoerking@giga.net.tw
i hope i can discuss this topic in MSN.
 

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