Re: TL082 opamp input range?


"John Popelish" <jpopelish@xxxxxxxx> wrote in message
news:0ZidnSUDXLj4XGXenZ2dnUVZ_sSdnZ2d@xxxxxxxxxxxxxxx
John Popelish wrote:
D. G. wrote:
(snip)

It must be able to buffer signals with sinus, triangle and square wave
forms up to about 50KHz with 2Vp-p.


How fast must the rise and fall times of the 50kHz square wave be?

And what is the power supply voltage?

Working with 9V supply. The signal is normally biased at 4.5V but can go
lower by design to shift the DC level at output. I just checked with a LM358
(got one in my stock :)
According to data***, slew rate is about 0.2V/uS. A 50KHz cycle is only
20uS so I feared it was too slow and... it is.
The wave form looks more like triangular.
May be I must stick with FET or MOSFET input to get a reasonnably higher
slew rate (5V/uS min) and low input bias (<100nA)

Dan


.

Quantcast