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Simulators >> Circuit Simulators >> THD Simulation for fully differential circuit
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Message started by packiaraj on Sep 17^th, 2007, 5:42am

Title: THD Simulation for fully differential circuit
Post by packiaraj on Sep 17^th, 2007, 5:42am

Hi,
I want to characterize a fully differential DDA programmable gain amplifier for its THD. The feedback is continuous time resistive feedback.
Can any one help me with the method of simulating THD for this PGA? I am using Spectre.

Thanks
Packiaraj.V.

Title: Re: THD Simulation for fully differential circuit
Post by boe on Sep 18^th, 2007, 7:27am

Hi Packiaraj,
You can use either an instance of Spectre's built-in device fourier or run a DFT on your output; if you want to use the DFT you need to carefully control the simulator to enforce equidistant synchronized sampling.
Hope this helps
BOE

Title: Re: THD Simulation for fully differential circuit
Post by packiaraj on Sep 19^th, 2007, 1:44am

Thanks Boe.