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tjgilbert / ece411

ece411 project repository
MIT License
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choose op amps for filter stage #16

Closed dahnk closed 7 years ago

dahnk commented 7 years ago

Need to handle frequencies around 125Khz

the LT1022 can handle it, it has an acceptable slew rate

here is the digikey link: http://www.digikey.com/product-search/en/integrated-circuits-ics/linear-amplifiers-instrumentation-op-amps-buffer-amps/2556125?k=lt1022

jmesserpdx commented 7 years ago

If we do a passive filter we may need only a simple transistor CC or CE amp to boost it for the output stage.

dahnk commented 7 years ago

I agree, currently simulating with active but will also simulate passive with bjt amplifier following

On Nov 10, 2016 2:38 AM, "Jann" notifications@github.com wrote:

If we do a passive filter we may need only a simple transistor CC or CE amp to boost it for the output stage.

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jmesserpdx commented 7 years ago

When you simulate BJT see if you can get an offset of 7.2 and 6.6 Volts with the follower. Then the output node can be at Vcc/2

dahnk commented 7 years ago

I have a bunch of TL074cn JFET op amps and these are working really well, I don't think we need to order anything else, but we can just for more testing, but the slew rate on these is more than sufficient to handle our 125kHz input signal.