# Questions tagged [quality]

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### Formula for Q of a parallel tank circuit

We have defined the Q as the following: Now I tried to apply that to the parallel tank circuit, I get : $$Q = RC\omega_0 + \frac{R}{\omega L}$$ However in the lecture notes and the textbook the ...
1 vote
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### Functional discrepancy within PCBA batch

When manufacturing a small prototype batch of an embedded system at EMS I have detected different behavior between the units. All units work as expected, except that some units fail to operate same ...
129 views

### What are the invisible reasons why many discrete transistors do not qualify for automotive use?

I looked today at the datasheets of this unqualified and this qualified product (per the AEC-Q101 automotive standard) and found no substantial difference, but I assume some stress damages only the ...
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### How to monitor Ethernet packet loss real time on different connections?

For an embedded application we have a network with star topology, where we want to determine if there is packet loss for the different point-to-point (SMAC => DMAC) connections. We consider ...
• 561
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### Why does the quality factor include 2*pi?

The quality factor is defined as the ratio of stored energy and dissipated energy (see below). The formula includes $2\pi$ as a constant coefficient. Why do we need $2\pi$ to calculate the stored ...
72 views

### How to perform quality assurance? [closed]

The site description is given as "Q&A for electronics and electrical engineering professionals, students, and enthusiasts" and I'm interested in "QA for electronics". Though I ...
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### On the topic of Quality factor in arbitrary RLC resonance circuits

In question Quality factor in arbitrary RLC resonance circuits, the OP asks about the Q of more complex circuits other than simple series or parallel RLC topologies. The responses I read, in ...
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1 vote
136 views

### 1-port VNA quality factor measurement

I am using an Anritsu VNA (MS2034B) to obtain the LINEAR MAGNITUDE and PHASE of S11 via a calibrated 1-port measurement. The DUT is an inductively coupled RLC resonator (schematic below). However, I ...
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### Designing a filter: does the order i which we cascade the sections matter?

So I am designing a 4th order lowpass filter using two biquadratic sections. I decided to split the gain evenly between both sections. After some calculations, one of the sections has a quality factor ...
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1k views

### What to check for when buying an electronic component or module

This has been raised as a canonical Q and A for future reference How can I acquire electronic parts/items/modules and ensure that there is minimal risk of them being unsuitable for my project or ...
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