Non inverting amplifier

[dwuihf]

                  i have constructed my circuit of non inverting amplifier. How to make some settings,so  that I high frequency gain will be at 25dB and low frequency gain -70dB or less, also the output frequency is  around 9.5KHz. Please correct for me if anything need to be changed with the circuit to achieve these parameters. thanks

[Mahmoud_W]

Hello,

I did some changes to your file so that you can best use Multisim in your design and simulation. Please notice the following:

- The opamps are now biased properly using the DC voltage supplies and the on-page connectors named properly

- The AC input should be a small signal from a source component or a signal generator as shown

- Changing the values of some of the resistors and capacitors changes the gain and cutoff frequency of the amplifier which now can be depicted on the bode plotter

- Adding an oscilloscope helps you visualize the input and output signal in the time domain

Hope you find this helpful.

Mahmoud W

National Instruments

[dwuihf]

thanks mahmoud for your help. 

[dwuihf]

Sir, what changes i have to make on the circuit to acheive this spects:

-low frequency gain=25 db

-cut off fequency= 12.5db

-the high frequency gain less than -70db

-at 35khz  the gain =-20db

-maximum pass band attenuation = 3db

-minimum pass band attenuation =-90db

iam trying to let the cut off fequency at 12.5db but i am not sure which values to set for the capancitor and resistor. any help is appreciated. thanks

[dwuihf]

sir, the graph does not match with the output response.

what changes i have to make on the circuit to acheive this spects:

-low frequency gain=25 db

-cut off fequency= 12.5db

-the high frequency gain less than -70db

-at 35khz  the gain =-20db

-maximum pass band attenuation = 3db

-minimum pass band attenuation =-90db

iam trying to let the cut off fequency at 12.5db but i am not sure which values to set for the capancitor and resistor. any help is appreciated. thanks

[Mahmoud_W]

Hi,

It is mainly the values of your capacitors and resistors that will influence the response.

You can refer to "Sedra and Smith: Microelectronic Circuits" for more design fundamentals.

Mahmoud W

National Instruments

[dwuihf]

sir,

     i still cant achieve  the gain of 17db at cut off frequency 9.5KHz.i have refer to gain equation to change  RC  values but still the 9.5KHz cant match with gain 17db.