Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
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...
source to ground inductance lna
Dear Mr. Dipak,
Thank you for your tips!
I got little better (22.5 dB) results by putting the chip directly on chuck (backside of chip is metalized). The heating was a problem (We guess!) when putting chip on some insulator material.
I have also included the...
how to troubleshoot lna
Dear all,
I have a designed a LNA using GaAs HEMT; from S paramater simulation the gain (S21) was about 24dB. Now the circuit (chip) has been fabricated and I'm trying to measure on-wafer S-parameter. From measurement I got only 18 dB gain (S21) and also to have this...
Hi Anna,
It says invalid netlis inside LVS... I did try according to your instruction... it didn't work!!
Can you pls tell me about the run directory "LVS"... how can I put a valid directory name/path?
Thanx
Nuddin
cadence lvs fail
Hi all,
I am desiging a differential amplifier in Cadence. I did the extraction from layout and it was successful without any error.I made the circuit in schematic and am trying to check with LVS ( I'm using divaLVS.rul).
The problem I am facing is that whenever I start LVS...
I did the following simulation to get the source stability circle for the specific transistor (hp_sp_AT-41435_1_19921201).
The plot I got for source stability circle is as fig-1
But the plot should look like as fig-2
Actually both of them are same plots. But in my case, the smith chart has...
differential amplifier input impedance
Dear all, I am designing a differential amplifier using HEMT (not with OpAmp). This will be fed from a small loop antenna which senses near EM field over an IC/chip. I am working with Agilent ADS.
I donn't understand how to simulate/ calculate the input...
My project is to design a single turn rectangular loop antenna on GaAs (100µm) substrate. I am trying to simulate a loop on GaAs subtrate only; without any background metalization/ground. But my problem is: I cann´t define the subtrate without ground/metalization. Whenever I want to defíne...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
