7 Threads found on edaboard.com: Rf Power Amplifier Stability
I am studying biasing circuits for RF linear PA applications.I can use some basic or suggested bias schemes. But I am not sure of their physical meaning. My questions are;
1. What is a typical impedance (real or imaginary) of bias input impedance relative to the impedance of RF transistor like ~X times? Why?
2. Why is the bandwidth of
Analog Circuit Design :: 11-11-2010 17:39 :: kyungyu :: Replies: 8 :: Views: 884
The power amplifier gain is part of the RF System analysis of the entire transmitter chain.
The gain and loss of each transmitter stage should be distributed from the modulator up to the antenna.
The gain of the power amplifier is limited by different factors, as stability, number of internal stages, (...)
RF, Microwave, Antennas and Optics :: 04-28-2010 01:09 :: vfone :: Replies: 2 :: Views: 632
I made stability simulation and it's ok. It seems stable at every input output impedances.
Here is additional information. The amplifier is LDMOS MRF6S27015GNR1. I commonly used the test circuit of the device. I transformed the impedances compatible to my dielectric substance fr4 , 1.6mm thickness where the test circuit was built in taconic rf-
Analog IC Design and Layout :: 03-15-2010 10:43 :: xeratule :: Replies: 3 :: Views: 1743
i need some material on multistage amplifier stability analysis. Is there any paper or guide in analyzing the stability for multistage rf power amp.
Electromagnetic Design and Simulation :: 02-10-2010 12:36 :: danesh :: Replies: 0 :: Views: 914
I am assuming that by intermittance you meant that you have intermittent output power cutouts.
This type of intermittence might be caused by excessive current and/or voltage across the RF capacitors in the RF circuit in itslf and/or in the RF by-pass network. If it is the case the capacitor's ceramic will be slowly cooked what, over the time, w
RF, Microwave, Antennas and Optics :: 03-02-2009 17:20 :: nandopg :: Replies: 13 :: Views: 3671
If I understand you right there is only a digital controlled oscillator which drive a PA with digital amplitude control. Every other thing is digital! That is the analog/digital interface for TX. How about the RX? Channel filtering in the digital domain? Or direct RF sampling?
Sorry there is not a single reference. Most of the techniques above a
RF, Microwave, Antennas and Optics :: 02-20-2006 16:20 :: rfsystem :: Replies: 17 :: Views: 2509
it is easy to check the stability of the power amplifier,follow the following steps:
1) link the signal source and the power amplifier and the attenuator with the spectrum analyzer.
2) set the power amplifier analyzer full span
3) then turn on your (...)
RF, Microwave, Antennas and Optics :: 03-06-2005 01:58 :: springf2000 :: Replies: 4 :: Views: 2336