TINA/Spice/LMH6624: TINA TI

Stefan Langlouis

Part Number: LMH6624
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hello,

I have a little problem with simulating the LMH6624. I would like to use this device for an Butterworth filtter 4th order. The max frequency i want to work with is 1Mhz.

None of my tried applications seems to work so i've broke it down to the beginning and tried some standard non inverting circuit.

The input Voltage is 100mV on 1Mhz.

Why is the simulation going into something like a saturation, vice versa the voltage follower seems to work.. Did i miss something? I have no clue where my mistake could be =( .

I appreciate any help.

over 5 years ago

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Stefan,

if you power the LMH6624 with a single supply voltage, you need to set a DC operating point like shown in figure 56 of datasheet.

Kai

0 Stefan Langlouis over 5 years ago in reply to kai klaas69

Prodigy 40 points

Hi Kai, thanks for the fast answer! I've already tried this...and the output was the same as in my uploaded picture. additionally i've set an offset of 50mV to my input signal, because my later signal isn't an AC as well. I read something about an decompensation of the phase shifting, but I think i'm out of that range :/ maybe i'm wrong and that does matter to my application

0 kai klaas69 over 5 years ago in reply to Stefan Langlouis

Guru 140200 points

Hi Stefan,

can you post your TINA-TI file?

Kai

0 Stefan Langlouis over 5 years ago in reply to kai klaas69

Prodigy 40 points

try1.TSC

0 Stefan Langlouis over 5 years ago in reply to Stefan Langlouis

Prodigy 40 points

the values are changed in this file. But ist doesn't work too. I think it has to be something with the Simulation program itself

0 kai klaas69 over 5 years ago in reply to Stefan Langlouis

Guru 140200 points

Hi Stefan,

if you use a single supply voltage, you must take care that the DC operating point is not amplified by the signal gain. So, you urgently need a high pass in the feedback loop, here introduced by C2:

stefan.TSC

Kai

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TINA/Spice/LMH6624: TINA TI