Questions tagged [matching]

Ensuring that two or more electrical components (transistors, resistors, etc.) have nearly equal characteristics (e.g. offset voltage, threshold voltage, resistance, etc.) for good performance when working together in a circuit.

Filter by
Sorted by
Tagged with
0 votes
0 answers
26 views

RF antenna matching circuit design for 53.4-219.2J load

I recently posted this question about designing a matching circuit for a Holtek BC66F2245, where I transmit data on 433.9MHz using a 50 ohm antenna. I have contacted the developers of the MCU and I ...
user avatar
1 vote
0 answers
90 views

32.768 kHz crystal - oscilloscope signal interpretation

As an exercise I measured (with a 100MHz 10x probe) the 32.768 kHz crystal signals on a board by varing the Cl1,/Cl2 capacitors. Here are the results: 12pF 15pF 22pF Can someone help me interpret ...
user avatar
1 vote
1 answer
40 views

Impedance matching method in multilevel inverter

I want to use a five-level inverter as an excitation source for magnetostrictive detection,which should be able to output a 100kHz sinwave. I learned that only if the output impendence of the source ...
user avatar
0 votes
1 answer
83 views

Chip antenna and uFL/SMA connector routing

I created a PCB on which, depending on the mounting variant, I would like to place a Johanson Technology 0868AT43A0020E antenna or a uFL / SMA connector for an external antenna. I have a few questions:...
user avatar
0 votes
1 answer
84 views

Matching rectifier with inverter

I'm trying to make a DIY wind turbine generator from a 3ph squirrel-cage induction motor but I'm having trouble matching the generator with the rectifier with the inverter. I'm not sure which ...
user avatar
0 votes
3 answers
154 views

Impedance Matching conditions for Matching Network

I'm trying to understand general concepts involved in impedance matching and I have question about the conditions which should be satisfied by the matching network. Assume we have in most general ...
user avatar
0 votes
1 answer
180 views

Impedance matching with L-matching network: cooking recipe

I would like to try to elaborate in detail how I think one should perform in detail practically impedance match between source and load via maximal power transfer using a L-matching network and whould ...
user avatar
0 votes
1 answer
37 views

Impedance matching at the generator side or the load side?

For impedance matching, are we matching in between the generator impedance Zs and Zin, or matching between the Z0 and ZL? or both? Similarly do we add the matching network in between Zs and Z0, or Z0 ...
user avatar
3 votes
2 answers
416 views

Impedance transformer, how to measure

I am preparing to do some RF mixer experiments with the SA612 Gilbert cell mixer. I started out with the impedance matching as I understand that the input and output need to be matched. From what I ...
user avatar
0 votes
0 answers
69 views

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(...
user avatar
  • 169
0 votes
3 answers
111 views

matching impedance transformer in old designs

I want you to see my question from an "historical point of view"... Building circuits that I found in magazines of the '60 I see a lot of interstage transformer between Ge transistor stages ...
user avatar
  • 477
0 votes
1 answer
413 views

What factors affect the threshold voltage in MOSFETs?

Does orientation of the MOSFET devices on a chip affect the threshold voltage similarity (matching?) What are the factors affected by different orientation.
user avatar
0 votes
0 answers
58 views

Bode Fano criterium and low Q-factor

I am currently studying the Bode-Fano criterium and how it can be used to design wideband amplifiers. It's stated that a low load Q-factor (high resistive component with respect to the imaginary one) ...
user avatar
  • 83
0 votes
2 answers
82 views

LVCMOS line matching

I have this ADS6125 ADC it has internal registers which can be programmed. The programming interface is LVCMOS I am planning to programm the registers with a 10 kHz clock frequency. How tight does ...
user avatar
1 vote
1 answer
34 views

Different 50Ohm-matched condition for different length of metamaterial waveguide

Based on coplanar waveguide, I am designing a meta-material waveguide by inserting lumped-element inductors along the center line. Here are some parameters: Target frequency: 10-20 GHz Size of lump ...
user avatar
  • 31
1 vote
1 answer
141 views

75 : 300 Ω Balun for 50 Ω matching at 900 MHz

I have a Murata Balun available DXP18BN7514T to match an unbalanced 50Ω source to a 300Ω differential load over about 50 - 60 MHz bandwidth. Unfortunately the DXP18BN7514T is specified as a 75 : 300 Ω ...
user avatar
  • 1,583
0 votes
2 answers
67 views

Does anyone use Statistical Element Selection for matching integrated circuit components or is this a university exercise?

I have to fix the transistor mismatch on a finfet amplifier design. I've seen lots of papers on Statistical Element Matching, all from universities, but haven't seen anything reported by companies ...
user avatar
  • 11
3 votes
2 answers
209 views

NFC Antenna Design/Matching without VNA

I would like to design a circuit around the W7002 antenna (Dataheet) and the NXP PN532 NFC Reader Chip. Since I never worked with antenna design before I do not have a VNA and I also don't have ...
user avatar
  • 33
0 votes
1 answer
40 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 ...
user avatar
  • 123
2 votes
4 answers
200 views

Impedance Matching Long 2000 meter Transmission Line

My apologies if this isn't the most appropriate forum to ask this question, but I have found the response from users on this form to be extremely helpful in the past with my electrical questions. I ...
user avatar
  • 115
1 vote
1 answer
108 views

Is there any way to match Vth of 2 mosfets with different aspect ratio?

For the floating mirror circuit to work properly, the threshold voltage of M1 and M2 must be the same. However, (W/L)1 ≠ (W/L)2. So I thought to get a first order matching I can match L1 and L2 (to ...
user avatar
1 vote
1 answer
415 views

Antenna tuning & impedance matching, do i need to connect the IC?

I want to make a pcb rf trace to use it as an antenna, for a bluetooth IC. I have already studied the basics of impedance matching and antenna tuning, smith chart and antenna clearance. The specific ...
user avatar
4 votes
1 answer
2k views

Should Ethernet MDI Pairs all be Length Matched (Inter-Pair) before going into magnetics?

I've been trying to find information for the above question and I can't seem to find anything. I have 1000 BASE-T lines coming from an Ethernet cable to a PCB mounted connector. I'm pretty much ...
user avatar
-1 votes
1 answer
116 views

Level Matching Circuit

Somebody know what do this circuit exactly or how it works ? Where VDD = 5V (MCU) and VDD_1V8 = 1V8 It is a recommended circuit to use uart communication when the voltage level are not the same, I ...
user avatar
  • 101
0 votes
2 answers
948 views

Differential pairs; length matching between pairs

I'm currently busy routing a high speed design containing MIPI signals @ 2,5Gbit / lane to a connector on an 8 layer board. As MIPI also contains a clock pair, it is advisable to match the length ...
user avatar
0 votes
1 answer
131 views

driving a medium power darlington transistor with the output of a 555 timer

Question: What is the limitation on the output of the 555 timer with respect to the requirements of the input of the BDW42G? Can the 555 provide enough current at 5 volts to trigger (sufficiently) ...
user avatar
0 votes
0 answers
69 views

Question about 50ohm impedance matching circuit

I am implementing rf energy harvesting circuit. The rectenna is working at 915MHz and the impedance is 50Ω. I think L-matching may be the easiest. However, I don't have the vector network analyzer. Is ...
user avatar
  • 59
3 votes
5 answers
1k views

What circuit can be used to match input to output voltage by using an opamp?

What is the simple way matching an input voltage range to a desired output range. To be more specific with an example: If I want to convert/match 0V-5V input range to 7V-15V output range linearly, is ...
user avatar
  • 1,419
0 votes
1 answer
186 views

Impedance Matching Network with tracks+connectors in between (practice)

I've been struggling on how to design (and develop in practice) an impedance matching network with some traces/tracks/paths (whatever you wanna call it) and some connectors in between. So here is the ...
user avatar
  • 1
0 votes
0 answers
62 views

Analogue Video Trace Matching

I'm working on an analogue audio, video and sync board for my Dreamcast. Something I've been wondering about is the tolerance for analogue video, specifically RGB, in regards to the delta for trace ...
user avatar
2 votes
1 answer
2k views

How does this impedance matching circuit work? How to simulate it correctly in SPICE?

I have a schematic for a current sensing circuit using a dedicated TI differential amplifier part for current sensing applications. The schematic also includes an "impedance matching" part for ...
user avatar
0 votes
2 answers
279 views

Narrowing a microstrip's tip

I have designed a 50 Ohm microstrip line. Following is an image of it. This is drawn in Eagle. Two layer PCB. Blue plane is the ground plane. The dimensions are: Width: 1250 micrometers Thickness: 1 ...
user avatar
  • 143
1 vote
2 answers
602 views

Impedance matching: L-network or micro strips?

I'm trying to embed a u-blox neo6m gps module to an stm32 controlled board. I'm planning to connect the module to an SMA connector and use a 50ohm antenna. The datasheet of the neo6m states that the ...
user avatar
  • 143
0 votes
1 answer
192 views

Receiver and transmitter with the same antenna [duplicate]

I want to build a simple transceiver (half duplex) for 433.92 MHz ASK modulation. I have found a transmitter chip and a receiver chip that I want to use. I want to use the same antenna for RX and TX ...
user avatar
  • 21
0 votes
1 answer
365 views

What is the op-amp in this JFET-matcher circuit?

In the circuit diagram on this page, there appears to be an unspecified op-amp. Could anyone guess at a component I could use for this and/or explain why there is no specification? Background: I am ...
user avatar
  • 123
1 vote
0 answers
328 views

Ouput impedance of a balun

I am using the CC1110 RF IC and I am having trouble when matching the differential RF output impedance with the antenna. The datasheet states that the differential impedance seen from the RF output ...
user avatar
  • 346
-1 votes
1 answer
412 views

Voltage source and its load resistance matching

i have implemented DAC controlled DC voltage source. I'm having trouble understanding physical reasons for voltage error due to load resistance change. My circuit desing was taken from DAC ...
user avatar
  • 3
1 vote
0 answers
25 views

Impedance matching for inductively powering / rectifier

I have two questions. If the receiver is inductively powered (by LC resonator) and needs a matching network in front of the RF-to-DC rectifier, what kind of quality factor of matching network (or Qs ...
user avatar
  • 11
1 vote
1 answer
638 views

Matching wideband antenna with QUCS

I am trying to match a dipole antenna to a 50Ω source. Problem is that for my frequencies (VHF) the complex impedance basically circles the 50Ω point between VSWR 2 and 3 lines. Because of that ...
user avatar
  • 11
6 votes
2 answers
3k views

Antenna Matching Network

I am trying to match a gsm antena, doing it on a pcb, first time in practice. I understand the whole process to adapt it, I've done it in simulators. However, I don't understand the need for a pi ...
user avatar
3 votes
0 answers
8k views

How do I convert S-parameters for impedance matching?

How do I derive the Z-parameters to calculate a matching network for a device? I'm not sure what terms to even search for as I get all sorts of information I am not familiar with. My task is to ...
user avatar
  • 330
2 votes
1 answer
963 views

Calculating characteristic impedance of a matching line

Attached is a question asking for the characteristic impedance of a matching line. A matching line of 0.25\$\lambda\$ has at its beginning an impedance equal to: $$Z_{in}=\sqrt{Z_{c}Z_{L}}$$ if I am ...
user avatar
2 votes
1 answer
239 views

Resistive on-die termination

It is widely known that resistive termination (e.g. 50 Ohm to ground) is superior when noise is no concern. Specifically in the block diagrams of RFICs I see many 50 Ohm resistors to ground directly ...
user avatar
  • 1,208
0 votes
1 answer
255 views

Matching radio tubes - what is widelly accepted tolerance in parameters?

When matching radio tubes, most important parameters are anode current and transconductance. Is there widely accepted tolerance in parameter variation? I have read an article where tubes are ...
user avatar
0 votes
0 answers
371 views

Capacitor matching by capacitance multiplier

I am developing an analog fully differential circuit that needs a tight capacitor matching to reach high performances. Because discrete capacitors are difficult (and expensive) to match for production ...
user avatar
  • 93
1 vote
1 answer
227 views

Impedance matching high power transistor when VNA is useless

Recently I've been stuck up with the high power transistor (2-10W) at 900 MHz that needs to deliver 30 dBm of the broadband signal to the antenna. Since it works in the high power mode, it behaves ...
user avatar
0 votes
1 answer
61 views

Antenna microstrip feedline discrepancy?

I've been looking at some reference designs to guide my own design recently, and I noticed some possible discrepancies on one in particular. This is the reference design: http://www.ti.com/lit/ug/...
user avatar
  • 1,255
0 votes
2 answers
128 views

Good inductor parameter for GHz frequency matching chosing

I want to buy inductor and capacitor for matching circuit of antenna in about 1.6GHZ. I searched the net for some inductor for ...
user avatar
1 vote
0 answers
98 views

Reliable antenna matching design of quadrifillar helix

I have simulated this antenna : I found its impedance, I know I have 50 ohm transmission. I decided to match these by discrete part in feed point, The match circuit is I want to ask from those who ...
user avatar
0 votes
1 answer
87 views

Matching an amplifier to a video transmitter

What I'd like to do is to amplify a signal coming from an analog Video Transmitter. I've created a small circuit according to the application circuit description of the "High Gain Driver ...
user avatar
  • 1