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The Designer's Guide Community Forum › Measurements › Other Measurements › PSRR for biases
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PSRR for biases (Read 68 times)
Tlaloc
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PSRR for biases
Oct 07th, 2008, 11:08am  
What is typically spec'ed for supply rejection for bias blocks providing currents?  Without a signal path, can we even have a PSRR, or do people just report the transconductance gain from supply voltage to output current?  Thanks.

Adam
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rf-design
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Reiner Franke

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Re: PSRR for biases
Reply #1 - Oct 7th, 2008, 12:27pm  
A good practice id the define maxmium noise voltage of the bias current or noise voltage if the supply, ground or substrate is noisy.

Over the common nets which does not have ZERO impedance noise is introduced. That gives also guidance for the noise generators. So a noise budget is a good way.
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