https://wiki.rev0.net/index.php?action=history&feed=atom&title=Rev0VTx_PA 2026-06-04T05:36:12Z Revision history for this page on the wiki MediaWiki 1.39.1 https://wiki.rev0.net/index.php?title=Rev0VTx_PA&diff=334&oldid=prev 2015-08-08T02:04:13Z

<p>Created page with &quot;This page describes the Power Amplifier (PA) for the rev0VTx video transmitter. ==Summary== <a href="/File:Rev0VTx_PA_Sch.png" title="File:Rev0VTx PA Sch.png">thumb|right|Schematic for the rev0VTx PA.</a> File:Rev0...&quot;</p> <p><b>New page</b></p><div>This page describes the Power Amplifier (PA) for the rev0VTx video transmitter. <br /> <br /> ==Summary==<br /> [[File:Rev0VTx_PA_Sch.png|thumb|right|Schematic for the rev0VTx PA.]]<br /> [[File:Rev0VTx_PA_Brd.png|thumb|right|Board for the rev0VTx PA.]]<br /> <br /> The PA is based around the [http://www.digikey.com/product-detail/en/MMG3006NT1/MMG3006NT1CT-ND/1971782 MMG3006 2W 0.4-2.4GHz Amplifier IC], and runs from a single 5V supply. The design was begun using the RF amplifier design program [http://www.utdallas.edu/~frensley/courses/EE4368/RF.html RF Assistant], created by Dr. Frensley of UTD. A PI and L matching network were created for the input and output, respectively, using the Match Maker program. <br /> <br /> [[File:Rev0VTx_PA_Match.png|thumb|480px|none|Initial input/output match determined in RF Assistant.]]<br /> <br /> The circuit was then simulated using [http://qucs.sourceforge.net/ Qucs]. The circuit and s2p file for simulation can be found here: http://www.rev0proto.com/files/rev0VTx_PA_Sim.zip Modifications were made in RF Assistant and simulated in Qucs to improve the match and gain of the amplifier. The final design has a gain of 17.9-18.6dB with an input/output match of &gt;11.5dB (VSWR &lt; 2) over the operating range of 1240-1300 MHz. A potentiometer or fixed resistor on the board can be used to adjust the bias current (850mA nominal). The gerbers, Eagle schematic and board file can be found here: http://www.rev0proto.com/files/rev0VTx_PA.zip<br /> <br /> [[File:Rev0VTx_PA_Graphs.png|thumb|640px|none|Performance of the rev0VTx PA as simulated in Qucs.]]<br /> <br /> ==Testing==<br /> <br /> ==PCB/Construction Photos==<br /> &lt;gallery perrow=3 widths=240px heights=120px&gt;<br /> File:rev0VTx_PA_PCB_Bottom.jpg|Bottom of unpopulated PCB<br /> File:rev0VTx_PA_PCB_Top.jpg|Top of unpopulated PCB<br /> File:rev0VTx_PA_Top.jpg|Populated PCB<br /> &lt;/gallery&gt;</div>

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