Module-2c: Two Port Noise Modelling 20 July 2018 16:40 Shot Noise - - PDF document

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Dec 12, 2023 231 likes •314 views

Module-2c: Two Port Noise Modelling 20 July 2018 16:40 Shot Noise vs. Flicker Noise Simple Temperature Sensor Modules Page 1 Reference: Prof. Ali Niknejad, Two Port Noise Analysis, 2015 Why do we refer noise to input? Modules Page 2 noise

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Simple Temperature Sensor Shot Noise vs. Flicker Noise

Module-2c: Two Port Noise Modelling

20 July 2018 16:40 Modules Page 1

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Reference: Prof. Ali Niknejad, Two Port Noise Analysis, 2015 Why do we refer noise to input?

Modules Page 2

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Identify all independent noise source (transistors, resistors, diodes etc.) 1. Determine transfer functions from each noise source to output 2. Determine total output noise v_nout or i_nout (sum of squares) 3. Divide by transfer function from v_in to v_out or i_in to v_out etc. 4. Procedure to determine input referred noise: Example noise Why do we split it into two sources?

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Sensor Noise vs. Front-End Noise: Which should be dominant?

Modules Page 4

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SNR Definition Example: What is the right SNR to choose for continuous signals? Higher sensitivity sensor --> costly ○ Increase signal

Straight-forward ways to increase SNR

Higher supply voltage --> greater amplitude --> more power (VDD*ID) ○

Module-2d: SNR and SNR Improvement Techniques

19 July 2018 10:35 Modules Page 1

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Increase gm --> higher power or larger area ○ Reduce noise

Decrease bandwidth?

○ Arraying of Sensors Example

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https://www.bsse.ethz.ch/bel/research/cmos-microsystems/microelectrode-systems/ _jcr_content/par/fullwidthimage/image.imageformat.fullwidth.340125254.png

Prof. Andreas Hierlemann's Group

Simulating noise (Discrete samples)

Modules Page 3