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44 Threads found on Pcb Lna
Hello, Did someone experience with simulation of RF pcbs (e.g. GPS). The signal propagation chain looks like this: Antenna GPS --> --> lna --> SW filter --> GPS module (e.g. from u-blox) All modules in such chain (except matching networks and antenna) have either Spice models either S-parameters. Mat
What if we solder source pin directly to ground plane on the other side of pcb? Although need to put vias on gate and drain, i can imagine gate and drain can be coupled to waveguides without vias. For high gain amplification and still stable solution
No, is not OK to use the same component values at those frequencies when the pcb thickness is increased 6x. The circuit might need another tuning adjustment. To maintain the linearity the circuit might need different bias when the matching components (which are frequency dependent) are changed.
Hello everyone I have lna mixer ıf amplifier and ıf filter on the pcb and I want to measure signal power,return loss, inertion loss on the pcb what is the best solution for this. Should I put directional coupler every spot or any other method to measure signal Thanks in advance
From this picture, you can't calculate the working frequency of lna. This picture only provides you a matching solution in pcb board. C11, L1 is the input L-type matching. C16,L3 is the output L-type matching. C8 blocks the DC current.
In most of the cases low power transistors are not multi-emitter, and they use two emitter pins on the package just to allow better pcb design at high frequencies. For example when design lna's working at microwave frequencies and need to use emitter degeneration inductor, or to decouple the emitter on both sides of the package. In these situations
Check the nRF24L01 datasheet, it has some sample pcb design and circuit with different type of antenna. range is not only depend on antenna. if you have to increase the range it requires some additional chip for power boosting . Search the net, you will get that also. lna and supporting chip design also available.
The Power Gain is pretty high and interstage couplings can create feedback and obviously be cause oscillations. Have you used shielding walls between the stages ?? How about GND paths and VIA configuration ?? Are you able to put your pcb and schematic here ??
Hi all. I have implemented on pcb the circuit attached (lna with bypass) but it's not working properly. If I open the circuit at node VA, and apply an external voltage of 5V, as a control analog signal of the switch, the bypass is done by the two switches (SW1 and SW2), each one is in the state ON-OF, and the lna2 is disabled too. (...)
IF you want to fabricate lna on pcb then there are good transistors available in market. For example BFR 92 or 92A, I am not sure about Cadence because I never used it. but in ADS libraries are available. If not make your own model. Or buy ready made lna chips from mini-circuits.
Hi to all, I am new by here. I am going to develop a board for WLAN 802.11p communications. In my board I am going to use a transceiver (MAX2828), a Power amplifier, a lna and a RF Switch. All these components are 50ohms I/O matched. So, my RF circuit consists about some RF components and some transmission lines to c
Second picture, some traces are designed to be inductive, so that is why components are placed apart. RFI is no problem as long as it is a single stage one a pcb. Problems start when ground loops are shared between mixers, digital circuits, lna and such. In schoolbook you can find examples on how to keep high isolation by dividing ground-plane in d
Hi everyone I'm wondering whether you could give some opinions. We have layouts designed and simulated in ADS such as lna, antenna etc .. and we want to use each of these ADS designed layout as a pcb library component in Altium. So the prob is: it seems to me that Import Wizard feature in Altium pcblibrary Can' import Gerber layout. (...)
pcb Layout or IC Layout ?? If you would draw a pcb layout, Altium 10 is pretty good and cost saving package.. I personally use it.. If you wish draw an IC or MMIC Layout, Cadence is the first choice then Mentor and ADS is also good for layout..
Hi all, I have designed an lna at 145MHz using transistor ATF54143. I have simulated the circuit in ADS with S21=19dB, S11=-20dB, S22=-15dB, k>5 for a wide frequency band, NF=0.3dB. After realization in FR4 pcb, I have a strange instability problem. It is unstable when powering, but it shows expected gain when I just touch the source pin to gr
From 9.5GHz to 6.5GHz is a lot, and I don think is about Er change of the material (this change can shift the frequency). At 9.5GHz parasitics of components are very important, and also their placement on the pcb. Ideally would be to have the S-parameters of each lumped component used, but sometimes is hard to get them up to this frequency. Momen
You mainly refer to parastic capacitance to substrate? This was the effect that seems most obvious to me, and might explain the high frequency issue. On pcb, I have used gate bias network with a combination of SMD resistor and lines up to 24GHz, so I am not aware of a fundametal frequency limit. But maybe I miss
If you post your application circuit, we can say something.. The schematic is necessary to check your circuit.Nothing is understood from your pcb.
Hi, I have a question for you. I have to simulate active mmic (lna) in pcb alumina substrate. I would to use Ansoft Designer but i don't know how. For the lna i have only the s-parameter (file *.s2p). Now if I have 50 Ohm microstrip, then i have to interconnect with wire bonding 50 Ohm line of the microstrip to rf input of (...)
You can use an open λ/4 stub switched with a PIN diode (as in the picture). The quarter wave stub is λ/4 at TX frequency. The length needs some tuning function of your pcb properties. The PIN diode should be biased (R1) according to the available lna_Vcc. When the lna_Vcc is 0V, the TL sees open circuit at one end, and (...)
Hi, I have a question about RF lna chip test procedures. The lna have been soldered on the pcb, with RF in, out connected to SMA connectors, and DC pin to regular connector. It is self-biased MMIC lna operating at 5.8GHz. In order to test its small signal gain and P1dB, what are the test procedures? Can somebody check the (...)
You should simulate your pcb in a planar 2.5D simulator such as ADS Momentum.. And then you will obtain s-parameters of your pcb then you can place a n-port device that will represent your pcb in schematic view in Cadence.. After that, you'll able to simulate your complete circuitin cadence design environment..
I design lna schematic. For modeling I use extracted model in chip schematic + pkg model + models external capacitors and inductors. In some nets I use tline3 created in LMG GUI. 1) How I can create model of my external pcb design and modeling in Cadence IC ? 2) Which utilites i must use for creating pcb design, extact transmission (...)
Use the following free program and calculate the length of the λ/4 (90 degrees) transmission line function the pcb you are using.
Hi connect both sources to the GND, therefore any resistance and inductance of the connection will be in parallel, both internally in the transistor and externally regarding pcb connections. flyhigh
between the pcb antenna SAW filter and lna, shall i use noise matching to match SAW out and lna input? thank you for advance
Aluminum in air will oxside and its surface prevent good conductivity. For applications where case is grounded and should be connected to RF circuit pcb ground and there are N-type connectors at input/output and must be grounded at case,how we can use this metal? Can we use IRON? which is better? Aluminum or Iron? Bets regards
in the IC , it the TL effect will not be clear in this freq , coz the dimensions are small compared to the wavelength but when u connect the lna to external pcb the TL will be clear Khouly
Hi, I am doing 12Ghz lna design using microstrip .I am using ATF36077 HEMT FET (avago) as the transistor and RO3010 pcb(Er=10.2). I have tried the layout procedures in ADS. it seems to be quite difficult for me to change my schematic to layout. Here i attached my design schematic for references and layout purposes. please help me to solve my
Hi, I am Murali. I am doing 12Ghz lna design using microstrip .I am using ATF36077 HEMT FET (avago) (Vds=1.5,Ids=10mA and Vgs=-0.2V) as the transistor and RO3010 pcb(Er=10.2).I am using ADS2005A for simulation. I have attached the schematic of my design for your viewing. I used Zin=15.547+j9.6410 and Zload =17.75+j4.99 for my design. I set th
hi, I am beginner to lna design. I am doing 12Ghz lna design using microstrip .I am using ATF36077 HEMT FET (avago) as the transistor and RO3010 pcb(Er=10.2). I am using ADS2005A for design and simulation. I have attached the schematic of my design and ATF36077 datasheet for your viewing.I used Zin=15.547+j9.6410 and Zload =17.75+j4.99 (...)
hi, I am beginner to lna design. I am doing 12Ghz lna design using microstrip .I am using ATF36077 HEMT FET (avago) as the transistor and RO3010 pcb(Er=10.2). I am using ADS2005A for design and simulation. I have attached the schematic of my design and ATF36077 datasheet for your viewing.I used Zin=15.547+j9.6410 and Zload =17.75+j4.99 (...)
0.2 to 0.5 dB from sim to meas is a typ degradation, commonlyfound also by good lna designers. To give you an answer a lot of details should be known. The NQS model could be one. Other can be: layout parasitic extraction, noise from bias/supply, model of passives (in particular inductors, if you use it), good pcb or fixture gnd and so on. I hope
Hmmm... Interesting frequencies - a DBS lna perhaps? Here is what you need: Use Rogers 4003 10 mil thick double sided pcb. Your microstrip filters size and loss will be good.
50 ohm matching is for interfacing with pcb.
Hi I am in the requirement of Rogers R4233 material datasheet (pcb) , pls upload the datasheet or link. Thanks and Regards Sug
I have to design spiral inductor for my lna, can any one help me designing spiral inductor on pcb? How does the width, spacing and diameter effects the inductance and Q? Substrate parameters are: Rogers 4350 Dielectric Constanat (Er) = 3.48 Dielectric Thickness = 250 um Loss Tangent = 0.004 Metal Thickness = 70 um Conductivity = 5.8
Can anyone suggest a flow or methodology on how to get a RF design (i.e lna) from ADS circuit simulation down to pcb? Which pcb software is recommended for this kind of design (1.8-5.7 GHz range)? What are the substrate recommended? Packaging wise? Testing facility? Especially for those in M'sia, anyone in this are? Your (...)
Well known Slovenian radio-amateur, dr. Matjaz Vidmar, S53MV, use FR4 for his SHF radios up to 10ghz. A practical FR4 laminate thickness for microwave circuits with SMD components is probably 0.8mm. A 50-ohm microstrip line has a width of about 1.5mm and about 0.2dB/cm of loss at 5.76GHz. Therefore microstrip lines have to be kept short
I would measure a GSM transceiver chip My chip can work on GSM 850, DCS1800 & PCS 1900 It include lna, MIXER, ADC, FILTER, VCO........ It is a complete RF front end for multi-band GSM and GPRS wireless communications. I need to list the measure apparatus and draw the pcb. But I don't have any experience. Can someone give me some data or advis
MWO layout tool may be okay for small circuits like the PA or lna. But for the entire phone pcb, the tool is not powerful enough. A typical cellular phone is tightly packed 6 or 8 layers with blind and buried vias. PADS can handle that.
if in same band others channel is under -107dBm of sensitifity, please check 1. receive path & track in pcb stack? 2. Is controll signal cross talk? 3. tracevier & lna power supply 4. I/Q DC offset
Hi, I have a pcb with lna connetcted to RF downconvertor at 1575MHz. Now I do not need this lna. How do I short circuit this lna. The input and output points are directly opposite. The board is a six layer board with FR4. Can I just use some capacitor to reduce the cabling or just use cabling? B R
Can anybody tell me something about the possiblities to include a GSM Antenna on a pcb. Any information is welcome Hollaender