How to minimize noise in 12V power supply?

I'm working on a project , in which I want to reduce the generated noise in output of an Op-amp due to noise present in DC power supply.

There are quite a few issues here. Firstly, is the noise inside, outside, or both, of the bandwidth of interest, I am assuming that the noise is not from your driving source, or from badly chosen resistor values and the configuration of your op-amp. What is your grounding like, if not done with attention to detail, this could make any of the following suggestions meaningless.
Is the DC supply linear or switch node. I assume switch mode. Switch mode supplies present numerous problems with respect to noise reduction, grounding, layout, type of converter, output filtering etc.
You really need to put a schematic or block diagram into the mix so we can see what you are trying to achieve. If the op amp has low open loop bandwidth, its power supply rejection will be low at higher frequencies. Power supply rejection can be different on the positive and negative rails if it has dual supplies. The other thing is to tackle the noise from the source. You may get away with an LC filter, these are available in SMD or through hole parts. It may require a linear regulator on the noisy output, you need to choose one with a high power supply rejection ratio and low noise at the frequency of interest. Anyway, post a schematic, it may help, with a few details about what you are wanting out of the system,
cheers,
Richard

Thank you Richard for your valuable response,
basically I required 6 to 6.5 Voltage(DC) and minimum 0.08 Ampere current to get work the internal circuit of the Op-amp.
So here want to do these three tasks
1, Maintaining the the 6V as it as coming from DC power supply( with internal resistance< 1m ohm and series capacitance around 2200uF ).
2. Maintaining the current at out point minimum 0.08A.
3. Minimizing the noise coming from Power supply and from other passive elements of the circuit.

and here what I have done so far.

from this attached circuit I getting 6V DC output and minimum noise (as less I required ) but main problem is about the current value; its coming in nano ampere and I need 0.08 ampere what should I do.

80mA is a lot of current for an op amp. Most op amps work from a few tens of micro amps to maybe 10 or 20 mA. I think you need to provide more info, what op amp are you using, and what is it driving. The power supply to an op amp needs to have a very low impedance, you don't want to put a series resistance in the power supply line. If you can't power the op amp directly from 12V, and it must be six, then you need a linear regulator on the 12V to bring it down to 6V.
A block diagram or schematic of the system would help.
Cheers,
Richard

I'm using OPA847 op-amp from TI. supply current for this op-amp is 18.1mA, as per my requirement I'm using 6V DC voltage(from data sheet), direct from
scientific PSD3304 power supply.
now what changes should I make to increase the current in circuit.
PS: sorry for mistakenly used word 12V instead of 6 or may be 6.5V.
JItendra

Please post a schematic with voltages and a load for the op amp.What are you trying to achieve?
You can't put a series resistor in the power supply lead without destroying the low impedance needed from the power supply. Do you have specs for the power supply.
The filter you have shown also needs to have the series resistance of the electrolytic capcitors (ESR) to more accurately model the filter. If you need to get rid of noise from the power supply, then a Low Drop Out regulator might do the job, it needs to have low noise and good power supply rejection. You could also use a Pi filter with a low DC resistance, these are available from places like Element 14. The op amp is a very high speed device, with a minimum gain of 12 for stability, you can't use a bread board to test it, it will need a very carefully done PCB layout, with extreme care around issues like power supply decoupling and the feedback network layout. If Texas Instruments have a demo board, you need to use that. There is no point in trying to model it in Spice either, the parasitics of your layout will not be able to be accounted for, and Spice will be absolutely useless. Are you sure the noise you are seeing at the op amp output is not the device oscillating? How much experience do you have in working with op amps with this sort of bandwidth.
The current in the circuit will be a static one needed to power the biasing networks within the op amp(18mA), and the variable load current, which will be load resistance and signal dependent. I am not sure what you mean about increasing the current in the circuit, if you mean the power supply filter, then you have to take the series resistor out altogether. Do TI have an application note about using this or others of their high frequency op amps, if so, you need to study then carefully before proceeding. As I have said already, please post a block diagram or schematic with voltages etc on it, so we can get a better idea of what you are trying to achieve,
cheers,
Richard

Hi, Jitendra

Try this circuit along with your power supply.This ckt will reduce noise level above
20 db .All resistors are half watt rated except the1 ohm resistor in the in put the
wattage of this resistor depends according to your load current.


Regards Sambath.

Hi Jitendra,

I would suggest you to use 7805 ic in your power supply and supply 5v to the op
amp ic long with the circuit i attached last time with my reply . Also reduce the value of the resistor R1 from 1k to 4.7 ohms to limit the current flow to the op amp ckt. Remove capacitor c1 and connect it from v1 to ground to form a pi filter .
If you are using a ground connection from the power socket then provide a 22
ohms 2watt resistor from the power socket earth terminal to the ground of your
circuit.This resistor acts as an earth loop circuit suppressing all the noises to the
ground. Richard Garbic is also correct usually op amp consumes a current of 10 to 20 ma





Thank you Sambath kumar.