before entering in to problem:
my application is a laser pulse detection, in this process when a laser pulse falls on photo diode it generates current, later stages include a I-V conversion, Gain,difference amplifier and comparator
my pulse characteristics:
pulse width min:10ns max:150ns rise/fall time:2ns-5ns pulse to pulse width:22uS
pulse to pulse width
How i selected the opamp for Gain and difference amplifier stages
key parameters: BW - bandwidth and SR - Slew Rate
from this literature i found my BW can be calculated by formula
Now slew rate is to be calculated
SR = 2 * 3.14* BW * Vp = 2 * 3.14* 175MHz *4V = 2198V/us
So Matching both these parameters is a CFA AD8003 from Analog, when i go for high slew rates and high BW almost all opamps avaliable are CFA's !
here below is the desing as suggested in datasheet, pulse here is a 10ns pulse with 100ns repetetion and 1V amplitude fromt the voltage source, i used the TIs TINA simulation and imported the spice model given by Analog Devices
results are quite unexpected
Attachment is the design of the above circuit which can be opened and simulated using TINA, because i did not find AD8003 in analog simulator and i was not able to import the spice model to ADI simulator
Kindly help in taking the advantage of AD8003
Apology for the very late reply.
Please use Simetrix, Pspice or Multisim in simulating the SPICE models of ADI for we only test the models on these three platforms. We can't help you on the simulation using TINA because TINA has different syntax and behavior.
Let us know if you still encounter errors using the recommended platforms.
Replace C4 with a wire and let us know what it does.