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Continuous time sigma-delta ADC noise shaping filter circuit architectures
The continuous-time sigma-delta (CTSD) analog-to-digital converter (ADC) is a class of sigma-delta analog-to-digital converters that utilize a continuous-time noise-shaping filter (NSF | H(s)). In this post, I analyze a few noise-shaping filter (NSF) architectures that affect highly linear CTSD ADC’s.
Posted in Analog Professional Also tagged active RC, continuous time, Gm-C, linearity, noise shaping filter, sigma delta 5 Comments
Calculation of ADC SNR in Cadence Skill/Ocean
However, here's how I compute SNR/SNDR from an FFT using Cadence Ocean/Skill.
Example Simulink model & scripts for continuous-time sigma-delta ADC
I've put together a 2nd order continuous sigma-delta Simulink model as a starting point. This is the multi-port feedback configuration (feeds back into input of 1st and 2nd integrators).
Posted in Analog Professional Also tagged continuous time sigma-delta, example, feedback, matlab, quantizer, sigma delta, simulink 19 Comments
Response to edaboard question “How can I deal with 3rd HD in a 2nd SigmaDelta Modulator”
In response to: How can I deal with 3rd HD in a 2nd SigmaDelta Modulator
It’s possible that the OTA is limiting you. Doing a matlab model of the sigma-delta and running it should tell you whether it is a circuit problem or a system-level problem. My hunch is that it’s a system-level problem: the noise-shaping [...]
Dual DAC CTSD | Wider Bandwidth and Higher SNR — Part 2