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Programmable Gain Amplifier

S

Shreyas Kulkarni

Jan 1, 1970
0
can somebody suggest me a low noise, faily low cost, programmable gain
wideband amplifier with bandwidth>=20MHz, gain varying from 1 to at
least 10 and with high CMRR?

any further links/tips/approaches will be highly appreciated.
TIA,
Shreyas Kulkarni
 
F

Frank Miles

Jan 1, 1970
0
can somebody suggest me a low noise, faily low cost, programmable gain
wideband amplifier with bandwidth>=20MHz, gain varying from 1 to at
least 10 and with high CMRR?

any further links/tips/approaches will be highly appreciated.
TIA,
Shreyas Kulkarni

Burr-Brown (oops, TI) has some nice digitally programmable instrumentation
amplifiers, but not with that kind of bandwidth. You haven't spec'd the
gain accuracy, input bias current, nor what constitutes "low noise".
There are additional choices if you supply your own analog switches
in tandem with the amplifier, many more if you supply the gain-setting
resistors though getting flat frequency response may require some care.
Maybe you provide more detailed specs, or at least what you might be
willing to trade off?

-frank
--
 
J

Jim Thompson

Jan 1, 1970
0
Burr-Brown (oops, TI) has some nice digitally programmable instrumentation
amplifiers, but not with that kind of bandwidth. You haven't spec'd the
gain accuracy, input bias current, nor what constitutes "low noise".
There are additional choices if you supply your own analog switches
in tandem with the amplifier, many more if you supply the gain-setting
resistors though getting flat frequency response may require some care.
Maybe you provide more detailed specs, or at least what you might be
willing to trade off?

-frank

The programmable gain (in 0.25dB steps) that I mentioned in another
thread (GPS/cell-phones) works at 1GHz ;-)

...Jim Thompson
 
J

Joerg

Jan 1, 1970
0
Hi Frank,
Burr-Brown (oops, TI) has some nice digitally programmable instrumentation
amplifiers, but not with that kind of bandwidth. You haven't spec'd the
gain accuracy, input bias current, nor what constitutes "low noise".
There are additional choices if you supply your own analog switches
in tandem with the amplifier, many more if you supply the gain-setting
resistors though getting flat frequency response may require some care.
Maybe you provide more detailed specs, or at least what you might be
willing to trade off?

Then there is the AD603 which is quite decent in cost, a few Dollars, if
that's in the budget. But my all time personal favorite is the old yet
still somewhat popular uA733. At under 40 Cents it is a steal. This one
needs to be treated differentially and gain control is not dB-linear but
at that price I always gladly took that in strides.

Regards, Joerg
 
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