Hi,
I am implementing integrator with tf for ex "tf=1/s+10".I know that in simulink it is easy to implement but I want to do it matlab code. So I am applying this tf to input signal with the help of filter function available in matlab like this "out=filter(tf,input_signal)"; my output should be integrated signal. But its behaving like low pass filter. Please correct me if I am doing wrong in applying integrator transfer function to input.

Thanks for help.

Hi BOE,
Thank you for your answer and your valuable time . You are correct. But for time being I have used "lsim(tf, input,time)" to get tf response to arbitrary input. It seems working fine.
May I ask you one more question?
What are the key aspects system designer must look at for behavioral modeling first order integrator with (unity gain bandwidth)UGBW 2GHz, DC gain should as high as possible and cutoff frequency must be very low.
I am solving this by using tf=G_dc*Wp/s+Wp     where Wp is cutoff freq and G_dc --dc gain.
Here How can i specify UGBW in the transfer function.
thank you once again.

HI BOE,
Yes. I think I have to read more about integrator to understand better its design issues at system level.

How to decide saturation limits of integrator based on its transfer function?
/NTR