Part Number: OPA860
Tool/software: TINA-TI or Spice Models
I have problem of OPA860 response in Transient and AC analysis.
In particular, the Gain ~ 2 V/V at f = 16,250,440 Hz as indicated in AC analysis.
However, when I did a Transient analysis ( Vsin = 16,025,440, 100mV ), the AC output voltage ~ 10mV.
Could anyone please help me to fix this problem ?
AC Analysis result
Transient Analysis result
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In reply to Hasan Babiker31:
In reply to user3925438:
the L1/C1/R7 resonance in your simulation is much too sharp. With the standard settings TINA-TI isn't capable to run the transient analysis precisely enough to exactly hit the resonance. Another issue is that you should allow the output signal to settle. Remember: Sharp resonance = Long settling time!
I have broadened the resonance by modifying L1 and C1. Now the transient analysis looks much better. But the resonance frequency of transient analysis 16.118MHz still doesn't fit the resonance frequency of AC analysis (16.25MHz) and the gain is incorrect either:
You could try to modify the analysis parameters to increase the precision of simulation. But I guess TINA-TI is not designed to run such sharp resonances.
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