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.
There should be a 90-degree phase difference between CLK and CLKBAR signals in Optical decoders. Leading Phase or Lagging Phase give Rotation Direction.
You dream too much. you cannot obtain a good set of PAE, Power Gain and Maximum Delivered Power simultaneously. No way ..
The found values by Load Pull technique are only and only for single frequency, not 2 octaves broadband.
If you have already found a ZOPT for a certain purpose, S22 can be...
I suggest you try other configuration such as Common Base with Transmission Line.
Transient simulation can work -if the oscillator truly oscillates- if you tie a step single step excitation source to the circuit in order to wake up the network.
Because initial state of the network can be...
ZIN is an Input Impedance while other Port is Loaded (any impedance)
Z11 is an Input Impedance while other Port Open Circuited
This is a basic knowledge of Circuit Theory.
Therefore Z-Parameters are called as Open Circuit Parameters, Y-Parameters are called as Short Circuit Parameters...
Next is to design a appropriate Matching Circuit.
Optimum Load Impedance is variable against Delivered Power. Take +20dBm Input Power as a reference then check your PA for other Input Powers.
You should draw Q Lines on Smith Chart then you can use this technique consecutively to reach 50 Ohm in a desired wideband.
There will so be multiple cascaded Quarter Line Impedance Matching Circuits, and this will give you a reasonable matching.
No, you have to do Load Pull simulation to find Optimum Load Impedance for max. Delivered Power.
See Cadence Spectre application papers/guides for more information. There is a Load Pull Tuner Component (or similar), and you can find optimum values by using it.
ZOUT of the amplifier?? What type of amplifier ?? Power Amplifier (my guess) or Linear Small Signal Amplifier??
So, you desire a Power Matching or Conjugate Matching ??
A microstrip Line with a approx. 20 Ohm , lambda/4 length will bring this impedance to center of Smith Chart @ 1.7325 GHz.
Find exact value of Zo by applying lambda/4 Impedance Matching Circuit. This technique does not cover a wideband range, but it might give also a reasonable matching over...
So you have maybe used lossy transmission lines like FR-4@10 GHz.
Your simulation technique is also wrong. You have to check negative resistance the active part only (oscillator core) without resonator circuit.
Additional to this, this configuration is not appropriate oscillator that woks @10...
I guess this is a compatibility problem and I think you created manually that symbol by attribute associated s-parameters. I believe you did a mistake while creating.
https://www.coilcraft.com/en-us/models/spice/
I use generally transmission line equivalent circuit model for inductors because...
First, amplifiers cannot be connected in this way because each amplifier impacts the other one so this is a really constrained/troublesome configuration.
Instead, Wilkinson Power Divider was innovated for power division or combining to improve isolation between amplifiers.
Conjugate Matching is...
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.
