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Science Forum Index » Electronics - Basics Forum » UHF 20-dBm PA circuit design......
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 Posted: Fri May 16, 2008 8:56 am |
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I need to design a few low-cost, linear, single stage, 20dBm power
amplifiers for UHF radio consumer use. I am familiar with designing
such PAs for saturated FM, but not for AM modulations. With linear
PAs, how can I design them so that each PA will have pretty much the
same output power from amp to amp (without tuning each one)?
Thank you,
-Nick |
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| Posted: Fri May 16, 2008 11:28 am |
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Guest
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On May 16, 2:56 pm, nick.adam... at (no spam) yahoo.com wrote:
Quote: I need to design a few low-cost, linear, single stage, 20dBm power
amplifiers for UHF radio consumer use. I am familiar with designing
such PAs for saturated FM, but not for AM modulations. With linear
PAs, how can I design them so that each PA will have pretty much the
same output power from amp to amp (without tuning each one)?
Thank you,
-Nick
AGC? |
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| Frank Raffaeli... |
| Posted: Sat May 17, 2008 5:39 pm |
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Guest
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On May 16, 1:56 pm, nick.adam... at (no spam) yahoo.com wrote:
Quote: I need to design a few low-cost, linear, single stage, 20dBm power
amplifiers for UHF radio consumer use. I am familiar with designing
such PAs for saturated FM, but not for AM modulations. With linear
PAs, how can I design them so that each PA will have pretty much the
same output power from amp to amp (without tuning each one)?
Thank you,
-Nick
Modules with fixed gain are pretty cheap these days, but if you need
to use discrete transistors, the gain consistency will depend mostly
upon biasing and temperature compensation.
What gain consistency do you need?
For better linearity and efficiency: Google feed forward amplifier |
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