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THD Simulation for fully differential circuit (Read 624 times)
packiaraj
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THD Simulation for fully differential circuit
Sep 17th, 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.
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boe
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Re: THD Simulation for fully differential circuit
Reply #1 - Sep 18th, 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
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packiaraj
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Re: THD Simulation for fully differential circuit
Reply #2 - Sep 19th, 2007, 1:44am  
Thanks Boe.
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