Oct 26, 2005

Hi,
Any one can please tell me what kind of power supply should I use for simulating high frequency RF ircuits (LNAs mixers, VCOs, amplifiers). If I use noisy power supply (amplitude of noise 50mv-200mv pp), I see my circuit does not work because RF input signals to LNAs and mixers very low. Should I use very clean power supply. In real case VDD and VSS PADS are connected through bond-wires. if I run simulation adding these bond wires inductors (2nH -4nH) from VDD to the power rail of the circuit and VSS to the ground-rail of the circuit, it adds excessive noise in supply and instead of signal, noise is amplified.
I am not sure, what is the practice of RF design, I should use clean power supply or use de-coupling capacitance between VDD and VSS for noisy power supply.

Thanks

Mahbub Reja