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.

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130 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 ...
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0answers
61 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(...
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3answers
106 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 ...
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1answer
252 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.
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47 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) ...
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2answers
71 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 ...
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1answer
31 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 ...
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1answer
122 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 ...
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2answers
65 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 ...
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2answers
170 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 ...
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1answer
36 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 ...
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4answers
183 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 ...
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1answer
89 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 ...
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1answer
320 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 ...
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1answer
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 ...
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1answer
98 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 ...
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2answers
806 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 ...
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1answer
115 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) ...
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68 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 ...
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5answers
949 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 ...
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1answer
149 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 ...
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60 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 ...
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1answer
1k 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 ...
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2answers
254 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 ...
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2answers
555 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 ...
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1answer
181 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 ...
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1answer
307 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 ...
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0answers
293 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 ...
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1answer
390 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 ...
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0answers
22 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 ...
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1answer
580 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 ...
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2answers
2k 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 ...
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0answers
7k 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 ...
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1answer
895 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 ...
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1answer
210 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 ...
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1answer
241 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 ...
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0answers
355 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 ...
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1answer
217 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 ...
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1answer
60 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/...
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2answers
118 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 ...
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0answers
94 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 ...
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1answer
85 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 ...
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1answer
390 views

How to make an impedance matched circuit for fabbed antenna?

Okay I have developed an antenna for a system and need to create an impedance matching circuit. The theory of conjugate matching is simple, but actually implementing it is something I can't find ...
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2answers
2k views

Transmission Line: characteristic impedance matching

The textbook explains a situation in which when you have 2 unmatched transmission lines (different characteristic impedance), you can connect a new line in between such that the input impedance would ...
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1answer
472 views

matching network design for transceiver with differential outputs

I'm trying to learn about matching networks. I have a 2.4GHz radio chip with differntial TXP/TXN outputs, and RXP/RXN input. These both share the same single ended antenna. I've been reading and I ...
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2answers
1k views

question about transistor matching circuit

I'm studying this transistor matching circuit provided initially by Bob Moog. I think I mostly understand how it works, the op amp, bjt not under test and resistors form a current source, which stays ...
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1answer
1k views

Matching transistors for discrete opamp (audio use)

I am building some GAR2520 discrete opamps that require a matched pair of BC550(CTA) NPN transistors. I built a simple emitter follower with a 15V supply, biased at about half that. I input a 1khz ...
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2answers
368 views

Matching ground references between computer and small DIY amplifier

I am teaching myself about audio amplifiers and put together a basic circuit to receive the signal from my laptop and then drive a pair of 32 ohm headphones. The small amplifier is powered by the USB ...
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3answers
129 views

Whats a good naming convention for part series and shunt components?

I have an RF receiver circuit which includes a ceramic chip antenna. Our chip antenna manufacturer "fine tunes" this antenna to the board and housing by determining the values of the Shunt and Series ...
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1answer
225 views

Transformer characteristic for impedance matching in RF

In an rf impedance matching circuit it is assumed that transformer is ideal or large enough. I just wanted to know the quantification of "large enough" (which parameter is large with respect to what) ...