LT1226 GBW is 1 GHz.As i saw in it's datasheet , it has GBWP=1MHZ
The circuit isn't biased. You are givign the input negative voltage while the output cannot be negative. Thus the limiting effect shown. Make sure you don't exceed the input common mode range, and make sure you don't exceed the output swing capabilities.I used LT1226 op-amp with Vss=+10V. the input was the sine wave generate from the function generator (Vp-p = 2V, f = 5MHz, DC offset V=0V).
LT1226 GBW is 1 GHz.
The shown circuit must be expected to fall into self oscillations, because LT1226 can't operate stable at a gain of +2. It's decompensated for a minimal gain of 25, please review the datasheet "compensation" chapter. Apart from this problem, I would appreciate a clear specification of power supply conditions, including bypass capacitors that are essential for a GHZ OP.
I do not really understand about self-oscillating for op-amp. I tried to google the stuff, but didn't find understandable explanation. I tried the example circuit for inverting amplifier with gain of 20 in the data sheet. I used Vss=+/- 15V and Vin = 100mV (p-p).
More precisely, it's only stable for feedback factor < 1/25. The circuit above has a feedback factor of 1/50. Another way to look at the circuit is as a resistive divider followed by an amp with a gain of 50.The device in question is only stable for closed loop gain > 25.
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