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DSD decoding - fully passive?

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DSD decoder contain:


reference voltage + low frequency filter.


1. Reference voltage (1 level + its inversion) - acticve element always. Voltage stability define non-linear distortions of decoder.


2. Low frequency filter. Passive realization possible, theoretically. However, troubles with lowest steepness of passive filter don't allow practical applying. Due increasing level of noise, comparing with active filter.

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