Difference between revisions of "Novena AFE"

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(EVT bringup notes)
Line 4: Line 4:
 
*R17P is wrong. The current value of 45k sets the output to 3.3V. Should be 52.3k to set the output to 3.7V
 
*R17P is wrong. The current value of 45k sets the output to 3.3V. Should be 52.3k to set the output to 3.7V
 
*R21C, R20C is too weak. Set to 1k to overcome the internal bias on SP0,1
 
*R21C, R20C is too weak. Set to 1k to overcome the internal bias on SP0,1
 +
===Loop filter tuning===
 +
Generated using ADIsimCLK - save file ad9520-3-calck.clk
 +
*R38C 1500pF -> 82pF
 +
*R23C 3k -> 2.7k
 +
*C37C 4.7uF -> 3.3nF
 +
*R25C 2.1k -> 1.3k
 +
*C36C 2200pF -> 270pF
 +
 +
*Loop bandwidth: 102 kHz
 +
*Phase margin: 43.6 deg
 +
*Zero: 37.1 kHz
 +
*Pole: 275 kHz
 +
*Last pole: 951kHz
 +
 +
Estimated phase noise and jitter to ADC:
 +
<pre>
 +
  Frequency: 1.00000GHz
 +
  Broadband Jitter (>1kHz) =  558fs rms
 +
    SNR =  69.10dB  ENOB =  11.52bits
 +
      at IF Freq =  100MHz
 +
  Integrated Phase Noise from  100kHz to 1.25MHz
 +
    Timing Jitter =  302fs rms
 +
    Phase Jitter EVM =  0.19 %rms
 +
    Phase Jitter =  0.109 degrees rms
 +
    ACI / ACR =  -57.5dBc
 +
  Delay from Ref to OUT3 is  250ps
 +
</pre>

Revision as of 13:11, 11 February 2014

Notes on Novena AFE

EVT bringup notes

  • R17P is wrong. The current value of 45k sets the output to 3.3V. Should be 52.3k to set the output to 3.7V
  • R21C, R20C is too weak. Set to 1k to overcome the internal bias on SP0,1

Loop filter tuning

Generated using ADIsimCLK - save file ad9520-3-calck.clk

  • R38C 1500pF -> 82pF
  • R23C 3k -> 2.7k
  • C37C 4.7uF -> 3.3nF
  • R25C 2.1k -> 1.3k
  • C36C 2200pF -> 270pF
  • Loop bandwidth: 102 kHz
  • Phase margin: 43.6 deg
  • Zero: 37.1 kHz
  • Pole: 275 kHz
  • Last pole: 951kHz

Estimated phase noise and jitter to ADC:

  Frequency: 1.00000GHz
  Broadband Jitter (>1kHz) =  558fs rms
    SNR =  69.10dB  ENOB =  11.52bits
      at IF Freq =  100MHz
  Integrated Phase Noise from  100kHz to 1.25MHz
    Timing Jitter =  302fs rms
    Phase Jitter EVM =   0.19 %rms
    Phase Jitter =   0.109 degrees rms
    ACI / ACR =  -57.5dBc
  Delay from Ref to OUT3 is  250ps