| Electronics > Beginners |
| 10kHz to 2MHz , 0.25mW to 150mW amplifier |
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| raff5184:
Hi all, I need the following amplification: INPUT: frequency range = 10 kHz - 2MHz V = 1 V peak-2-peak I = 1-2 mA peak-2-peak OUTPUT: Vo = 12 V peak-2-peak Io = 80-100 mA Power = 30 dBm (about 1W) Does something like this exist that I can buy? Or I can also build one, but what basic component do I need? Would an OpAmp do the trick? Also, if the bandwidth is too large for the amplification that I need I can split the amplification in 2 (max 3) sub-amplifiers, each covering a sub range of frequencies, this is not an issue. Thank you |
| dmills:
ADSL line driver or two plus a transformer or Balun? Linear or TI spring to mind for some reason. Regards, Dan. |
| T3sl4co1l:
FYI, ADSL drivers are apparently really quirky, don't use them outside the range that ADSL needs (even if the specs say or imply they can run over a normal op-amp sort of range). Maybe okay here. A modestly fast line-driving-capable op-amp or buffer should do fine here. Shouldn't have trouble finding one off the shelf. :-+ Possible gotchas: supply voltage range, slew rate, distortion, RMS output, load impedance (resistive? complex? nonlinear?), transient ratings if any, passband flatness, cutoff band slope, etc. Reminds me of something I breadboarded years ago, You might want something more powerful than '390x's for output, for which you might use some SOT-89 BJTs instead, which will get you plenty of dissipation into a copper pour, for 1W output. Or a TO-126 something or other if you prefer THT. A discrete solution should be a rather extreme measure, for something that ought to be commercially available, so this is just FYI. :) Tim |
| Cerebus:
Tim, nine transistors? Two too many surely? As to the OP's problem, Jim Williams' Linear application note 47 has a couple of handfuls of useful designs that will meet your spec and a lot of relevant tutorial material. Now on Analog's website: http://www.analog.com/media/en/technical-documentation/application-notes/an47fa.pdf. |
| T3sl4co1l:
--- Quote from: Cerebus on April 17, 2018, 10:33:07 pm ---Tim, nine transistors? Two too many surely? --- End quote --- Alas, t'was before 7TL's time (I said it was old). ;D It could... ehhhh... let's see: - The one current mirror could be a resistor and transistor, simple enough. Worse offset, who cares right? - The diff pair tail could be a resistor. This impairs common mode range, but that would be acceptable for modest-gain and inverting applications. Ahh... that feels better 8) Tim |
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