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Adding high frequency noise to analog circuits

Hello Community

I am planning to design an analogue circuit to measure voltage and current signals from a DC source.

However, before measuring the signals, I want to superimpose high-frequency noise on both the signals (of different magnitude).

Is there any way of how to do that in the analogue domain? Does exist any analogue component/circuit that can inject noise on the signal path?

Any idea will be much appreciated.

Kind Regards,