All Questions
Tagged with impedance-matching circuit-analysis
15
questions
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Slight difference in equations for the design of resistive matching network
I'm currently reading trough an application note from Analog Devices 2, in particular the "A NARROW-BAND LC MATCHING EXAMPLE AT 100 MHz" section. I re-did the calculations by hand and got ...
- 113
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2
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78
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How to calculate output impedance of switching regulator?
If I consider a buck converter where in 24 volts, L =100 μH, capacitor 47 μF. Then converter will operate at 400 kHz. How do I calculate the output impedance of the converter?
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113
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100
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RF antenna with satisfied impedance matching. Does it work really?
Before I start, how I did an impedance matching for the antenna of my RF source, let me show couple pictures, so I can manage what I am talking about. Below there are:
The impedance matching ...
user321220
4
votes
1
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227
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Why would the power sent in the first place for it to be reflected on say a transmitter if antenna is open, or a higher impedance antenna connected? [duplicate]
I'd really like to know in a fundamental way why power is said to be reflected during a mismatch and mainly if this is related to the maximum power transfer theorem. By that logic, if the load ...
- 667
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3
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Does the L/C-shunt vs C-shunt/L order of an L-match matter?
Two different sites with L-match calculators show different LC schematics as shown below. Note that Schematic 1 shows C1 on the source-side and Schematic 2 shows C1 on the load side. Both sites ...
- 2,190
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687
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Antenna pi-network matching High or low pass?
I am a beginner in RF system design and I have some questions.
I have a PCB trace antenna, I need to tune it to 2.45GHz, this is for Bluetooth low energy communication.
I want to use a pi-network for ...
- 31
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245
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Impedance matching in Transmitter Circuit
Consider the FM transmitter circuit from here (https://eeeproject.com/fm-transmitter-circuit/) with circuit diagram
In this question (Antenna in Transmission & Receiver circuits) I was going to ...
- 281
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212
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Causes for negative port resistance of passive device (or obtaining |S11|>0 from measurements)
Suppose you have two reciprocal (passive) devices, A and B, both described with S-parameters \$S_a\$ and \$S_b\$. With a VNA, you measure \$S_a\$ and \$S_{\rm tot}\$ (S-parameters of AB, both devices ...
- 1,326
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2
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2k
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Quality factor and frequency bandwidth in a matching network
It is known that the quality factor appears in the formulas for transformation of an impedance series bipole to a parallel one. A simple example is this one:
Now I have three questions:
I have ...
- 3,550
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89
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T - matching network design
can you help me on understanding the procedure to design this T - matching network?
My aim is that of transforming a resistive load R to a complex value R'', while R' indicates an intermediate value....
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Circuit diagram of an oscilloscope with 50 ohm load impedance
I was told some oscilloscopes have 50 ohm impedance settings for radio frequency measurements for impedance matching (as opposed to one 1M ohm resistor and a 10pF capacitor in parallel for load ...
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sx1276 Understanding matching network
I want to use the sx1276 LORA ic as a node that can transmit and receive at 868MHz. In order to use that band of frequency one has to use Higher frequency rf pins of the chip (rfo_hf and rfi_hf). The ...
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5k
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Second order RLC filter and load resistance choice
In this 2nd order, low-pass filter circuit
simulate this circuit – Schematic created using CircuitLab
I am interested in the transfer function
$$ H(s) = V_L (s) / V_g (s) $$
which is (...
- 748
2
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1
answer
141
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Analyzing reflection and transmission without a VNA
The wikipedia page for network analyzers mentions "reflection and transmission of electrical networks are easy to measure at high frequencies" but doesn't give any hint on how this is done or what it ...
- 2,659