Questions tagged [impedance-matching]

Impedance matching is a process of making one impedance equal to another another.

Filter by
Sorted by
Tagged with
0
votes
3answers
46 views

Impedance Matching between Source and Load

I am having this basic doubt In the basic crude basic block diagram, we have a source, transmission line and load, all having an impedance of 50Ohms. But according to maximum power transfer theorem, ...
-1
votes
1answer
29 views

Impedance Matching of an Antenna

I am reading about antenna design and have a few questions which I could not get clarified. I read about "Stubs". I got to know that Stubs are used for impedance matching of an Antenna either by ...
-2
votes
0answers
24 views

Match a Crate 150w (1x8 ohms mono/ 2x4 ohms stereo) to cabinet 2x12 Celestion 70/80 each 80w at 8 ohm [closed]

I have a homemade cabinet with two celestion speakers seventy 80 with rated 80 watt at 8 ohms each one. And a Crate Powerbank amplifier with two outputs. One 150 watt at 8 ohms bridged mono out. Ando ...
3
votes
1answer
54 views

Voltage Follower Circuit Output Changes based on Load Resistance

I am trying to simulate a circuit which can act as a voltage follower for a headlight. I simulated the circuit using CircuitLab. I simulated two conditions: When headlight resistance is 10 Ohm. ...
5
votes
4answers
613 views

Why should a receiving antenna be impedance matched to 50 ohm instead of a lower impedance?

I'm in the process of getting to grips with RF design and am having some trouble understanding why we should always match antennas to \$50\Omega\$. I understand from the maximum power transfer ...
1
vote
0answers
40 views

Why is an attenuator placed on the scope end and not the PCB end?

I've noticed when adding an external attenuator between PCB and the scope (1MOhm) that it is placed in this manner: PCB -> SMA Socket -> SMA Cable Plug -> SMA Attenuator -> SMA-to-BNC -> Scope Why ...
0
votes
2answers
49 views

How does Impedance matching equation work out from original link?

From this link: L-Pad Impedance Matching Equation How do you get those two equations? They do not look like a voltage divider formula, do they? Questions repeated here: First answer from Adil ...
0
votes
0answers
24 views

Antenna impedance matching within metallic enclosures

What im trying to achieve is kind of an chip antenna breakout board, since it must sit within a metallic groove. The plan is a PCB of 10mm diameter with an U.Fl connector on the back and an antenna ...
0
votes
1answer
29 views

Should I cut away the ground pour above a diffpair on the first inner layer, which are Z-matched to the ground layer (L2)?

I'm routing diffpairs on the 1st inner layer of a 4-layer pcb which are Z-matched to the 2nd inner layer which is entirely a ground pour. The top layer has traces and routing AND also a ground pour ...
0
votes
1answer
42 views

PCB Antenna Tuning

I am trying to tune an antenna as seen above, using this wonderful Smith Chart Tool. It needs to match 35 + 10j characteristic impedance. I have found a tool like the Microstrip Impedance Calculator ...
1
vote
2answers
75 views

Speaker impedance and voltage

There is a device which has output impedance 150ohms. If my headphone has either lower(30ohms) or higher (400ohms) impedance can I use it or sound will be too low/high and it will be unsable? Also, ...
1
vote
0answers
25 views

Determining Z1 for voltage divider of RF Matching Circuit

I have a problem where I was given an RF circuit with a series RL load. I am tasked in finding a matching L circuit and determining the values of the components. I used a smith chart to determine that ...
0
votes
1answer
26 views

How to calculate component value of a matching network

You can already expect my knowledge level In antenna designing (newbie). This may be or may not be a stupid question. The reason is I don't know about this very much. Iam designing a PCB for ESP32 ...
1
vote
1answer
58 views

Can 3Ω speakers match 4~16Ω amplifier? [closed]

I have a set of Samsung home theatre system. The Samsung DVD player is no longer working. I would like to get a new amplifier and reuse the 5 existing Samsung speakers. But the existing speakers are ...
1
vote
1answer
29 views

Understanding series open stub tuning

I recently had an assignment where I had to use open stub series tuning to find a way to maximize power delivered to the load from the generator. I understand that power delivered to the load is ...
1
vote
1answer
35 views

Padding/impedance matching of a phono input

My old stereo amp got coffee spilled on it. I replaced it with the latest model from the same manufacturer. I am an old-world person, and prefer simple approaches - i.e., radio buttons to select ...
0
votes
1answer
34 views

Best way to connect a coil to a source with 50Ohm impedance?

I have a 50Ohm impedance source at 800Mhz and a coil with complex impedance Z = 0.0028 + j3973.9121 Ohms at 800Mhz. I would like to maximize the current through the coil and protect the source. I ...
0
votes
1answer
24 views

Which Signals require impedance matching?

There are two types of connections in PCB. Which are in between the PCB.(e.g- A SD card is connected near to Controller) One is going out through some connectors.(Some UART or SPI going out through ...
0
votes
0answers
19 views

32F746GDISCO Stackup and Ethernet Impedance

I have an example board with PCB about the ethernet application. I noticed a mismatch between stack up and ethernet lines, or something else I don't know. Ethernet Lines are drawn with 0.125mm and its ...
0
votes
0answers
20 views

Find PCB Antenna impedance and matching circuit

I'm working on a project that uses NFC interface. I need to design two antennas: one for the RFID tag and another for the NFC initiator. I decided to use the design proposed in the evaluation kits. ...
0
votes
1answer
48 views

Questions regarding AFG3000C function generator

I have a new function generator - model AFG3000C. I am having difficulty in understanding certain terms related to this function generator. I have tried online searches, but I couldn't get what I ...
0
votes
0answers
30 views

Ferrite antenna impedance matching

I want to use a tuned ferrite antenna with my RTL-SDR. From what I understand at the point of resonance, only the real (resistive) impedance remains. This should be a few ohms for the resistance of ...
0
votes
0answers
29 views

LM386 High Pass Filter Design? [duplicate]

I was looking into the datasheet for the LM386, and they provide an example implementation circuit. At pin 5, as I understand it, you can expect an amplified signal with a DC offset of Vcc/2. I can ...
2
votes
2answers
62 views

LC Filter / Matching - Why does this cap help?

this is my first question on the site, so please let me know if there's something I can do to write it more helpfully. The Problem: I'm building a small radio. At the output of my mixer, I need to ...
3
votes
0answers
55 views

Why circuit from antenna datasheet is like this?

I'm designing circuit with nRF52810 BLE SoC and I have decided to go with ceramic chip antenna because it seems easier than designing printed antenna. The problem is that I'm just a 1st year student ...
0
votes
1answer
63 views

Input/Output Impedance of DC/DC converters and Impedance matching

I am interested in understanding how do DC/DC converters achieve impedance matching for maximum power transfer applications. After visiting this entry, you can see in the "impedance matching" ...
0
votes
1answer
58 views

At which point and how to connect VNA on the PCB for antenna tuning?

I am working on a 2.45 GHz(Bluetooth) project. I have used a ceramic chip antenna with 50 Ω impedance for this board. I've placed a Pi network close to the antenna and also I have used an integrated ...
0
votes
1answer
68 views

What is the purpose of these components in an LC Balun?

I'm trying to understand an antenna impedance matching / balun network that I came across in the receiving signal path in the schematics for the STEVAL-FKI868V2 S2-LP Evaluation Board, shown in the ...
1
vote
1answer
64 views

Is this an Impedance Matching Curve?

This may be a very quick answer, I had a test that was set up like this. The primary inductance of the transformer was roughly 0.022H and the inductance of the secondary of the transformer was 0.045H. ...
0
votes
1answer
43 views

Designing a bluetooth audio unit for speaker

(Cross posting from Sound design stack exchange since it was declared off topic there) I have a sony speaker from an old Home Theatre System that is broken now leaving the standalone speakers in a ...
0
votes
1answer
118 views

Measurement of s11 with reduced power on NanoVNA

I am developing a 10.7 MHz IF amplifier for a radio receiver. In order to match the input to the output of the driving mixer stage (330 ohm) I need to measure the input impedance. I did the ...
1
vote
1answer
42 views

Impedance matching an amplifier near 1 dB compression point

I am using a RF amplifier (model: Minicircuits LZY-22+) to drive 6.5 MHz oscillation in a coil. I am using an antenna tuner (model: MFJ-969) to impedance-match the output of the amplifier to the coil. ...
0
votes
1answer
28 views

What is the general procedure for matching networks when there are multiple circuits are connected back to back?

If I have two circuits like the one shown above (Rx antenna -> block1 -> block2 -> Tx antenna), where all should I add matching networks. How should I look at the impedance while doing the matching ...
1
vote
2answers
63 views

Path of a signal traveling on a mismatched transmission line

I have a basic question about the path of a signal traveling on a transmission line with a short circuit as termination. Suppose that this line is driven by another line (at left) with Zc = 50 Ohm ...
0
votes
1answer
33 views

How is a transmission line with a different characterisitc impedance shown on the smith chart?

A transmission line can be shown on the smith chart as a clockwise rotation, each 180 degrees corresponding to a quarter wavelength. But this is when the characteristic impedance (Z0) of the ...
0
votes
2answers
63 views

What does a simple passive circuit to simulate an impedance mismatch look like?

I am trying to learn some of the basics of circuit design. One thing I am curious to make a filter/schematic of is what happens when a voltage source hits an impedance mismatch. eg. A high impedance ...
0
votes
1answer
40 views

Do I have match impedance while routing PAL video tracks?

I am designing a PCB with PAL video output. PCB contains 50ohm and 100 ohm traces. The connection between RF coax connector is very close. So 75 ohm traces are 80 micron for my stack-up. I am confused ...
0
votes
2answers
140 views

how to change output impedance of op amp

I have made a non-inverting op-amp using lf351n with gain of 5 and i need to connect the op-amp to a device with input impedance of 50ohm.I want to know how to make the output impedance of the op-amp ...
0
votes
1answer
61 views

Why is feeder network so long and other questions?

I have an mBed Lora 915Mhz shield I attached to a Raspberry Pi. I had some questions about the feeder network. In the attached schematic. Why isn't a simple cap/inductor pair sufficient for an ...
0
votes
1answer
50 views

Coupling coefficient of microstrip resonators

I am working in HFSS and I'm trying to determine the coupling coefficient between two microstrip resonators (k) so that I can design a filter using a certain resonator shape. I have the formula I need....
0
votes
4answers
140 views

50 Ohm resistor at SMA connector

I am designing a schematic with TI ADC12DJ3200. This ADC is differential 100 Ohm input impedance ADC. In Eval Board of this ADC a Balun is used to convert single ended input from SMA to differential ...
0
votes
0answers
33 views

Impedance Matching required at Output of RF sampling DAC?

I am designing a schematic with TI DAC38RF80. This DAC is having integrated balun and gives single ended output voltage upto frequencies 4.5GHz. Output power of this DAC is less as shown below: In ...
0
votes
1answer
39 views

Choosing RC values for Active LPF to match signal input impedance

I am design a basic 1st order Active LPF with unity gain and am new to this field. How do I make sure that I choose my R and C values to match the input signal impedance or does this not matter? What ...
0
votes
0answers
38 views

Impedance matching to minimize VSWR

I was trying to determine what the impact of impedance mismatching would be to an RF output and I came across this. About half way down the page, the author makes this claim. In general, if the ...
0
votes
3answers
89 views

Split hdmi signal the passive way

I would like to know if it's possible to split a HDMI signal (generate by raspberry pi or equivalent) to a deserializer (TFP401APZP) and to a micro HDMI. I have a source going direct to the TFP and ...
0
votes
0answers
31 views

ESP32 6x6 pi matching circuit

I'm trying to make my own ESP32 board, and everything so far seemed really self explainatory... expect for one thing. The ESP32-D0WDQ6 has an impedance of 30+J10 Ohm on the antenna pin, but I need to ...
0
votes
1answer
47 views

Impedance matching in RF Circuit - Determine the required Q

I am working on an RF project and I notice that many sources I have used, recommend using a pi network (CLC), such as the image below, to impedance match the RF trace to the antenna. I have a really ...
0
votes
0answers
64 views

How power is conserved in tapped capacitor impedance matching circuit..?

I have recently came across a text of impedance transformation provided by a tapped capacitor arrangement. Its a rare and unique text explaining the working of tapped capacitor network in terms of ...
0
votes
1answer
225 views

Connecting a 75 ohm device to a 50 ohm antenna

I have a device operating at low-frequencies (470 - 790 MHz, Television White Space), which works with a 75 ohm antenna. I want to connect this to a 50 ohm antenna instead. The 75 ohm end has an F-...
0
votes
1answer
73 views

Impedance matching between rectifier and antenna?

I have a confusion about the impedance matching between the antenna and the RF-DC rectifier. The antenna(915MHz) was bought from the market and the datasheet says its impedance is 50ohm. However, I ...

1
2 3 4 5
8