TINA/Spice/THS4541: A TINA-TI simulation circuit for phase compensation verification

Hi Tomoaki,

I am not quite sure what you mean by "simulation circuit for verifying the phase compensation".

Are you referring to Open Loop Frequency Response that can be used to measure phase margin perhaps? or are you referring to closed loop configuration such as shown in this THS451 TINA-TI reference: http://www.ti.com/lit/tsc/sbom907 ?

Let us know

Herman

Hi Herman-san,

Thank you for your reply.

I am glad to either reference circuit, but I want a reference simulation circuit especially for open loop frequency response characteristics.

I am unfamiliar with TINA-TI, so it is very helpful to have a simulation environment as it is.

Best regards,

Tomoaki Yoshida

Hi Herman-san,

Thank you for your support.

It was very helpful for me.

Best regards,

Tomoaki Yoshida

Hi Herman-san,

I have a question for open loop test bench.
I often see a open loop simulation that cut the feedback loop with the Hi-z element.
Since the bias conditions of the actual circuit are different on the test bench that I got, I would like to analyze the open loop with the circuit assembled.

I think that I can do it by modifying the closed loop test bench, but what should I do?
I am in trouble because I do not know how to input AC to virtual ground point.

please support me.

Best regards,
Tomoaki Yoshida

Hi,

I want to simulate to set the peripheral circuit constants of THS 4541.
In order to set the compensation capacity, I would like to verify the AC characteristics of the open loop with an actual circuit load.
Should I adjust C1 and R2 in the circuit THS4541 Open Loop.tsc I taught above?
I assume that the feedback resistance from the output of the amplifier to the input is 2.5kΩ and input resistance is 1kΩ.
In this case, how much resistance should be set R2?

I am sorry if it's a bad question.

Best regards,
Tomoaki