Questions tagged [quality]
The quality tag has no usage guidance.
14
questions
0
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3
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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
0
answers
44
views
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 ...
0
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3
answers
129
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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 ...
- 472
2
votes
1
answer
66
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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
3
votes
2
answers
463
views
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 ...
- 41
-2
votes
1
answer
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 ...
- 615
2
votes
1
answer
195
views
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 ...
- 618
1
vote
0
answers
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 ...
- 43
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143
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Q factor of higher order circuit
I am trying to understand the concept of Q factor for higher order circuit. Consider the circuit as shown in the figure
I calculated Zin using Matlab and the transfer function looks as follows:
$$Zin(...
- 179
0
votes
2
answers
85
views
If a PCB is inspected to an IPC-A-600 class higher than specified what are the negative impacts?
I have received several parts from a PCB manufacturer which should have been inspected to IPC-A-600 Class 2 but were instead inspected to IPC-A-600 Class 3.
I believe I have received PCBs inspected to ...
- 57
0
votes
1
answer
137
views
Measuring experimentally the poles parameters
I have the following Sallen & Key lowpass filter:
$$T(s)=\frac{\frac{1}{R_1R_2C_1C_2}}{s^2+(\frac{1}{C_1R_1}+\frac{1}{C_1R_2})s+\frac{1}{R_1R_2C_1C_2}}$$
The parameters values are
$$R_1=10 k\Omega$...
- 1,391
3
votes
3
answers
577
views
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 ...
- 1,391
10
votes
1
answer
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 ...
- 437k
4
votes
3
answers
131
views
Is it reasonable to qualify a component by testing only?
Just got assigned (sole) responsibility of a major product group in my company. I have discovered that we regularly use components outside of their specifications, and justify that by testing the ...
- 4,558