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Design >> Analog Design >> Integrator Leakage (finite op gain) impact on 2nd order SDM?
https://designers-guide.org/forum/YaBB.pl?num=1508264927

Message started by neoflash on Oct 17^th, 2017, 11:28am

Title: Integrator Leakage (finite op gain) impact on 2nd order SDM?
Post by neoflash on Oct 17^th, 2017, 11:28am

The impact of integrator leakage on 1st order sdm is clear. Any conclusion on its impact on 2nd order SDM from leaky 1st and 2nd integrator?

Regards,
Neo

Title: Re: Integrator Leakage (finite op gain) impact on 2nd order SDM?
Post by jdp on Oct 28^th, 2017, 11:19pm

Due to leaky integrator, the low freq response of integrator gets affected (becomes flat from the expected -20dB/decade slope) - this consequently affects the NTF of the SDM, which also becomes flat instead of having 20dB/decade slope, so overall, the noise shaping gets afftected in low freq range...should be similar in case of 2nd order as well.