Difference between revisions of "Low-cost 1 Watt RF power amplifier (in progress)"
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| − | Low-cost, 800mA RF power amplifier used for tabletop MRI scanners to drive small solenoid coils (~1cm diameter NMR sample tubes). This board uses the Motorola MHW592 RF amplifier module, which is obsolete, but available on eBay. The board runs on 24 Volts and includes a linear regulator and blanking circuit controlled by a gating signal from the spectrometer. The blanking cuts power to the RFPA quickly (for instance to eliminate unwanted RF noise during signal readout). There is an optional low-power first gain stage that can be bypassed with a jumper wire if it is not needed. | + | Low-cost, 800mA RF power amplifier used for tabletop MRI scanners to drive small solenoid coils (~1cm diameter NMR sample tubes). This board uses the Motorola MHW592 RF amplifier module, which is obsolete, but available on eBay. The board runs on 24 Volts and includes a linear regulator and blanking circuit controlled by a gating signal from the spectrometer. The blanking cuts power to the RFPA quickly (for instance to eliminate unwanted RF noise during signal readout). There is an optional low-power first gain stage that can be bypassed with a jumper wire if it is not needed. The MHW592 power stage provides 35dB of gain with a 1dB compression point of 900mW. |
Datasheet for MHW592: https://datasheetspdf.com/pdf-file/1114767/Motorola/MHW592/1 | Datasheet for MHW592: https://datasheetspdf.com/pdf-file/1114767/Motorola/MHW592/1 | ||
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Revision as of 15:08, 19 May 2022
Low-cost, 800mA RF power amplifier used for tabletop MRI scanners to drive small solenoid coils (~1cm diameter NMR sample tubes). This board uses the Motorola MHW592 RF amplifier module, which is obsolete, but available on eBay. The board runs on 24 Volts and includes a linear regulator and blanking circuit controlled by a gating signal from the spectrometer. The blanking cuts power to the RFPA quickly (for instance to eliminate unwanted RF noise during signal readout). There is an optional low-power first gain stage that can be bypassed with a jumper wire if it is not needed. The MHW592 power stage provides 35dB of gain with a 1dB compression point of 900mW.
Datasheet for MHW592: https://datasheetspdf.com/pdf-file/1114767/Motorola/MHW592/1
Click here to download EAGLE board files (layout and schematic), GERBER files, and Bill of Materials.
