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TLV9064: Unity-gain bandwidth at LTSPICE

Michael Mor Yosef
Prodigy 190 points
Part Number: TLV9064

Hi,

I downloaded SPICE model from TLV9064 webpage https://www.ti.com/product/TLV9064#design-development 
And I want to measure unity-gain bandwidth and success to measure only 5 MHz in LTSPICE, Why? maybe I didnt build LTSPICE proper?

My motivation is to simulate my connection of OP-AMP (with the relevant resistors values) and to measure cutoff frequency.


Thanks!
Michael

  • +1
    Guru 48395 points

    Well your LTSpice file is at a gain of 2 with very low Rf=Rg=10ohm, that is a 20ohm load to the output, you should increase those into the 1kohm region, 

    The gain of 1 TINA model shows about 17Mhz f-3db, 

    If you load it with 10ohm Rf=Rg, only 870kHz BW

    In your 2nd circuit keep in mind there is a 4pF input C to the V+ node, 

    That will add a pole due to your source R of 3.2k at 12MHz. 

  • 0 in reply to Michael Steffes
    TI__Mastermind 27360 points

    Hi Michael M.,

    Michael Steffes is right. The gain of 2 is going to be cut the bandwidth about half, aka 5MHz. 

    Also we only tested the model in Tina and Pspice for TI. We cannot guarantee that the model will perform as expected in other spice simulators like LTspice. 

    Best Regards,

    Robert Clifton

  • 0 in reply to Robert Clifton56
    TI__Mastermind 27360 points

    Hi Michael M,

    Did you set the supply voltage to 12V? If so that's violating the recommended supply voltage range and the absolute maximum voltage range of 5.5V and 6V respectfully. 

    Also your input common mode voltage looks to be set to ground. That's a potential problem in your circuit since your VEE is also ground. You will likely be clipping the signal. 

    Best Regards,

    Robert Clifton