Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [mixed-signal]

A circuit which contains both analog and digital signals.

A circuit which contains both analog and digital signals.

79 questions
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PCB microcontroller layout in a mixed-signal system

This is a direct continuation of this question. So here's my layout, what do you think about the microcontroller side? UPDATE April 2019: I built the board in spring/summer 2016, but never got around to updating the results here. The board works…
Timo
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Design essentials when working with 12bit ADCs

I'm currently designing a board that is attaching a 12bit ADC (MCP3208) to a Raspberry Pi (besides a few other low speed I/O related stuff). It will mostly be attached to analog sensors (temp sensors, IR distance sensors and similar things, while…
timonsku
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Details on PCB layout for microcontroller

Update: the follow-up question shows my take on the resulting PCB layout. I'm laying out my first board with a uC (I've got a reasonable amount of experience in using and programming embedded systems, but this is the first time I'm doing the PCB…
Timo
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Proper way of connecting logic GND / power GND on MOSFET driver

I am tring to build half bridge using IR21844 mosfet driver, i have read datasheet and design tips and some of the topics in this forum. The one thing i still cannot get is the separate GND pins between logic and power. I Qoute from an article:"The…
ElectronS
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What's the best ground topology for this mixed signal board?

I'm designing a 4 layer mixed signal PCB with sensitive analog circuits and RF-digital circuits. The board have many mechanical constraints so the places of the analog and digital circuits are fixed. When designing the ground plane I added some…
Caniko
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Review of my first ever PCB design for a watering control robot.

I'm building a small watering control for one of my large indoor plants. This is my first real electronics project outside of school. Although I studied EE at university and did my basic component and filter theory; I studied almost exclusively…
Emily L.
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How does a Delta-Sigma DAC work?

I have looked at how the Sigma-Delta ADC works and I understand it. However, it seems to me that there is not a lot of literature about the Sigma-Delta DAC. I want to build a model of it in Simulink. Can someone explain to me how it works?
Yaakov
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Help with deciding my layout for EMC tests and SI. Different alternatives

I am thinking of what way would be the best to layout my system in order for it to have the best SI and pass EMC tests. My system consists of two PCBs joint by a flat flex cable (up to 7cm) and these are some requirements: The bottom board must…
jorpese
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Help to translate jitter design constraint in a frequency synthesizer design with 4046 and 4017 ICs

I'm trying to design a frequency synthesizer with the old-school 4046 and 4017 ICs, with a scaling factor N = 1,5,7,10. The input signal is a square wave with adjustable frequency from 1 kHz to 10 kHz. I want to get a time jitter < 1% of the…
C.Slade
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How does this AGND to DGND connection work?

I'm working on an audio circuit, and part of the circuit looks like this: simulate this circuit – Schematic created using CircuitLab What is going on with this circuit? The ground has a lot of noise, and with this circuit I can't hear it at all, so…
brazed_blotch
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Back to back Schottky diodes between ground connections

In a mixed-signal IC, you most likely will have two ground planes, analog ground and digital ground. This seems fair enough and easily understandable but my real question is: Why would you need to insert back to back Schottky diodes between two…
12Lappie
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How deos this clock generator work?

This circuit shows a clock generator, where a capacitor is charged to a certain voltage for half a period (phi opening switches S1 and S2). The same voltage but with negative polarity will be shown to the comparator input V_IN in the second half…
Andrea Toffanin
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How Can the Quantization Noise of an ADC be Measured using the Digital Output?

The ADC quantization noise is the error signal generated by rounding the sampled analog values of signal. Suppose that we have the digital output of an ADC, how can we measure the quantization noise, only using the digital data, and without…
Alex L
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MOSFET capacitance clarification

Two part question here: Are there ways to directly test the input and output capacitance of a MOSFET, Ciss and Coss? Due to internal inductance and capacitance, is it possible for a standalone MOSFET to resonate at certain frequencies?
Jaywalk
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Reducing the offset voltage of a source follower

I am currently trying to reduce the offset voltage of the circuit attached below to less than +/- 2mV over a 1V to 4V input range. I have a few constraints for this task: I can use nmos, pmos and pmos4 but can't use nmos4 as the fabrication process…
Oreoluwa Adesina
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