kuohsi
Member level 3
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!!
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!!