Daniel Jackson escribió: > Forward Section: List Of Sections Below This Section: > > These views are primarily for SDR radio hobbyist to try and so, may > not be the kinds of views that an engineer would use on the job. > Though the topic herein is based upon a discussion from page 5.27 of > the 2005 ARRL Handbook, by R. Dean Straw N6BV ~ ARRL Senior Assistant > Technical Editor. > > Forget about those Wikipedia and Internet writers and bloggers who > give us mile long ~ and quite useless equations, without any > definitions or problem solving solutions. Here you will get answers > and even definitions in dB terms of how to tackle the 3rd OID > products problem in RF amplifiers that do not have the gain > controlled by AGC which is the typical SDR radio requirement. > > (- My job here, at least for my own self, to my own advantqage, was > to find a means through LTspice models of receiver circuits, to > employ the comments of N6BV in a small signal amp design that did not > require any attempt to attenuate or control the RF signal input to a > stage to limit 3rd order intermodulation distortion ~ 3rd OID or III > OID.) > > Those of you who respond to this topic, keep in mind that I have been > having a email bouncing problem here with my group email that I have > not been able to resolve as of yet. So, it will be a matter of when > I can get back to the group to read the post. I doubt that it will > come to my email box. Of course there are many members here, so the > response may be answered by anyone. > > * * * * * * * * * * * * * * * * * * * * * > > > ( 3. ) Class C Small Signal Amplifiers For SDR Designs
Dealing with definitions, this is a mistake. A small signal amplifier has to deal with signals much smaller than the base cutin or gate cuttof voltages (signals applied to the base of a bipolar transistor of less than 26 millivolts), and the only way you can achieve that is using bias, which effectively makes the amplifier work as class A. By definition, a Class C amplifier conducts less than 180 degrees, and is used only in large signal conditions 73, Jose, CO2JA VI Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética 9 - 12 de Junio 2009, Palacio de las Convenciones ...Por una cultura energética sustentable www.ciercuba.com
