700KHz-3MHz amplifier
时间：04-04
整理：3721RD
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Hello,
i was requested to design a 700KHz-3MHz 50W amplifier for a piezoelectric probe. The problem is the load: it could be a probe with a resistive part of 3ohm up to 30ohm and the resonance is in 700KHz 3MHz band.
So i suppose i can't do a power match as i was used in rf power amplifier. I just decided to use 2 Vishay MOSFET in a class B push-pull topology with a 28V power supply and an output transformer. But i don't know how to design the output matching. Maybe i will match it at 30ohm and then i will check it at the other working condition. Is that a good idea or there are different methodology of design for such a power amplifier? What i can look-through to understand how to make sucha type of amplifiers?
Any idea is welcome
Thanks a lot
regards
i was requested to design a 700KHz-3MHz 50W amplifier for a piezoelectric probe. The problem is the load: it could be a probe with a resistive part of 3ohm up to 30ohm and the resonance is in 700KHz 3MHz band.
So i suppose i can't do a power match as i was used in rf power amplifier. I just decided to use 2 Vishay MOSFET in a class B push-pull topology with a 28V power supply and an output transformer. But i don't know how to design the output matching. Maybe i will match it at 30ohm and then i will check it at the other working condition. Is that a good idea or there are different methodology of design for such a power amplifier? What i can look-through to understand how to make sucha type of amplifiers?
Any idea is welcome
Thanks a lot
regards
The problem sounds like "Audio Power Amplifier Design". Because the loudspeaker impedance is not constant in that case.
I'm not expert on this subject but "Transformer Output Audio Amplifier Design Chapters" that can be found on the internet can help you much.
Let 3MHz not you make you fear because modern ferrite transformers are easily available.