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Why first order modulator limited to 1-bit quantizer?

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neoflash

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first order modulator

Why it can't use multi-bit quantizer?

Thanks.
 

sumit_techkgp

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You can use a multibit quantizer. Where are u using, it depends on that!. What is the application ?
 

neoflash

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It is for fractional-n sythesizer. Does it matters?
 

sumit_techkgp

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U have a DAC. One bit DAC is a simple switch. More than one bit involves nonlinerity. Thats the reason. One bit circuit has lesser nonlinearity.
 

mike_bihan

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This says it is a soft limitation and not a hard one. We can still go multi-bit quantizer in 1st order MOD, at the cost of higher non-linearity, right?

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sumit_techkgp said:
U have a DAC. One bit DAC is a simple switch. More than one bit involves nonlinerity. Thats the reason. One bit circuit has lesser nonlinearity.

by the way, the sigma-delta modulator is in digital domain for frequency synthesizer, so there is no limitation on DAC linearity.
 

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