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 are some amplifiers that must have low input impedance,high output impedance and operate at high frequencies, the common grid amplifier is the best choice. (Example: for loading high Q resonant circuit).
You can use common grid/gate/base amplifier up to ft of active component for making...
You can make with one tube - resonant circuit and then place saturation circuit.
Is not relaxation oscillator, but it works.
(keep in mind that resonant circuit plays the role of transformer in amplitude tranbsformation ratio)
I think you can measure the nonlinearity by the classic two tone test or triple beat method. First I start with pure tone and superposed DC Bias for magnetization curve and extracting the tranformer parameters.
Because two or more tone test is difficult if not high isolation (the sum of...
impedance transformer -ferrite uhf
if is for reception a small binocular transformer made by 8:5 turns ratio can be done good results. Since 8/5 = 1.6 and (1.6)^2 = 2.56 close to desired ratio.
Try also a quarter wave transformer made by microstrip. Multisection transformer gives you broadband...
I'm designing very high power amplifier for wireless communications (2 kW), in my case efficiency/linearity is the bottleneck.
For satellite communications I think that the bottleneck is LNA, but also good efficiency is important, and good response to extreme enviromental factors such as...
Re: Microstip as spiral
Really microstrip acts as transmission line if the EM fields are confined between strip and ground plane, so in first approximation, no coupling must appear.
However, is well know that some dispersion of fields exist and the idea of mutual coupling takes sense. I...
spiral mutual inductance
really spiral strip-microstrip coupled lines either conventional straight coupled lines have mutual inductance. Both cases are Electric-Magnetic coupling.
"Second question: Spiral once made will have some inductance in it and that will change the reactive part of...
rf amplifier imd
"This is wrong approach. it should be reverse."
(Although I will try this)
How is calculation for efficiency? is it pulsed power supply?
Are you following the same substrate, art work of manufacturer etc?
"The amplifier need to operate below 300W for -40dBc...