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Design >> Analog Design >> DAC output impedance & PSRR
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Message started by yanivsa on Apr 26^th, 2007, 8:09am

Title: DAC output impedance & PSRR
Post by yanivsa on Apr 26^th, 2007, 8:09am

Hi all, I'm new here,

Well, I need guidance with simulating differential Current mode DAC Output impedance & PSRR.
Appreciate your help with this.

Thanks.

Title: Re: DAC output impedance & PSRR
Post by ywguo on Apr 28^th, 2007, 3:29am

When measureing the output impedance, turn on all current sources if you need know the minimum value. Put an AC voltage source Vt in series with the output. Run AC simulation, probe Vt/I(out).

Let's define the PSRR as the gain from the supply to the output. Then run a transient simulation with a small sine voltage source, say 100mV, in series with the supply voltage source. Measure the output amplitude and calculate V(out)/V(sin).

Yawei