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September 16th 03, 02:47 AM
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Interstage filtering between FM RF amps?
My question is whether I need interstage filtering between two 900MHz saturated amplifiers in an FM (FSK) transmitter. One stage is the driver amplifier outputting about +15dBm, and the other stage is the PA, outputting +30dBm. I want to keep parts count and insertion losses down, but do I need such filtering to keep mixing products to a minimum, or is the standard TX output bandpass filter all that I need in an FM system? Many Thanks! Mike |
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