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Ok, I think that I got it. I need those differential pins where I have a real current exchange and the - pin has to be in the layer below the + pin. But, what about the other pins such as P34? There is not a physical connexion with the ground. How do I have to set these pins?
Ok, I understand that but my problem is that I don't have an infinite ground to set the - reference of my ports. I don't know how ADS can handle that and where it sets the GND reference. This is the reason I think that I need diferencial ports instead of grounded ports.
Sorry, I'm not a native speaker and my english is not as good as it should be. I will try to explain what I said before. I mean that I have 2 pins for every SMD element. There are few components that are grounded, such as decoupling capacitors. So I have 1 pin in the signal path and another one...
I checked it and it is correct, probably it was something that I changed before I took the picture. How do I set the GND?
This is what I have:
Do I have to set the GND using the symbol or a pin? Or do I have to set it in the schematic?
Ty!
substrate definition in ADS 2011
Hello there I'm looking to set a substrate in ADS2011 to simulate a PCB design. The problem I face is that I have a 2 metal layer PCB: cond1 dielectric cond 2 because I have path in both sides of the board. I would like to get a EMmodel to simulate in schematic...
Hello everybody! I'm looking to set up a dynamic link between ADS and expedition PCB of Mentor but I haven't been able to do it yet. The problem is that when I try to connect Expedition with the ADS server an error pops up:
Has anyone dealt with this kind of issues?
Ty very much!
Hello everyone!
I need a switching n-mosfet for a 50MHz pulse at the gate. The specifications would be Vds=1V and Vg=1.8V and in Enhancement-mode. The current should be around 5mA and I need a spice model (or ADS design kit ) for this transistor because I have to simulate with it. It's use...
Hello everybody! I'm trying to understand what is going on with this oscillator.
I have a cross coupled oscillator with 2 BJT and a current source to bias transistors. The problem I have is that when I increase or decrease the current of this oscillator the frequency changes. Is it normal?
I...
Hello everyone! I'm trying to design a receiver for 868 MHz carrier and I'm facing problems with the mixer model. My receiver will be made by discrete components and I would like to buy the blocks instead of designing each one by myself.
The receiver will be composed of a LNA, a mixer and a...
Well BigBoss, I finally have gotten the HB simualtion! At last! The problem was all the time the bottom mosfet bias. The reason is that I want to get an OOK modulation so I need a pulsed Vdc source at the mosfet gate to get those pulses.
When I wanted to test the oscillator alone I only changed...
Ty very much.
Is there any way to find the equivalent resistance of the tank and the active load (bjt) usign ADS? Or do I have to find it analytically?
If analytically, I checked that the bjt differencial pair have a -2gm resistance so if I have Ic=2mA it drives to a -26Ohm resistance. Is it...
Ty again, BigBoss. I have another question: Why do you need the current mirror part? I have seen that usually you can use this to double bias the BJT (With VCC from above and with the current source) but you have 3 biasing points (one from the VCO, another from VCC and the last one from the...
Hello again BigBoss and Ty. I don't get why do you said that the varactors are wrong polarized. If the tank nodes (a,b) oscillate around 1.8V (2.2-1.6), I should be able to polarize them with a 0 to 1.6V vtune in this configuration. Am I wrong? Why do you need those coupling capacitors in the...
Your advice is very helpful, ty very much. I still have a problem with the HB convergence. But the most weird is that if I use an oscport or only the nodes, I get a different kind of error. If I use the oscport at the same point as the first circuit at the top of the page, I get this:
"Warning...
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