Electronics > Projects, Designs, and Technical Stuff

Power driver (or amplifier) for signal generator

(1/4) > >>

ricko_uk:
Hi,
I have a Rigol 60MHz signal generator and am looking for a power driver (with or without amplification) with the following specs:

- able to drive inductive loads (with both positive and negative square waves)
- can take inputs of at least 10V
- output current up to 2A preferably 3A
- square wave's rise time (for a 10V square wave) to be ideally less than 50ns, preferably 10ns
- amplification is not needed but would be nice
- ideally (not required) short circuit protected

Questions:
1) what should I look for? Where is the best place to find ready built ones?
2) Any low cost (100-200 USD) part suggestion?

Thank you

OM222O:
you have a few options:

-Class D amplifiers: basically meant for this task (however I'm not sure about their bandwidth as they're meant for audio applications). They can handle inductive loads (speakers) and have high output currents.

-Class AB amplifiers are your next best bet but require heat sinking for high current loads. If you choose the right transistors, they can definitely reach 60Mhz.

If either of those solutions didn't match your required specs for rise time of square waves, you can use a high speed mosfet driver, which controls a push pull CMOS stage allowing you to drive high currents quickly, just choose fets with low gate capacitance and a fast driver.

ricko_uk:
Thank you OM0222,

cannot use the mosfet drivers because I have positive and negative square pulses (forgot to mention that in the OP - updated now).

Class AB sounds interesting, where can I find low cost ready-built ones?

OM222O:
you should ideally design your own using BJTs or Mosfets. Class AB also uses two diodes and 2 resistors to bias the drive elements so both conduct around zero volts instead of both being off. I think you can buy off the shelf ones but they're most likely low power options.

ricko_uk:
Thank you OM0222

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod