S
Syd Rumpo
- Jan 1, 1970
- 0
I have an existing device with low-noise differential amplifier at the
front end. It uses two LT6200 op-amps in inverting configuration and
has a gain of ten.
Occasionally, that's too much gain, and an attenuator is pugged in in
front of the amplifier.
I want to make the gain electronically switchable without hurting the
noise performance, so I want to avoid analog switches.
These op-amps have a disable pin. It seems that if I disable the op-amp
then the signal goes straight through the input and feedback resistors
and on to the next stage without gain. That's handy as I can control
the disable pins with a spare uC output.
As long as the signal doesn't exceed the supply at the op-amp pins, that
should work fine. Shouldn't it?
Cheers
front end. It uses two LT6200 op-amps in inverting configuration and
has a gain of ten.
Occasionally, that's too much gain, and an attenuator is pugged in in
front of the amplifier.
I want to make the gain electronically switchable without hurting the
noise performance, so I want to avoid analog switches.
These op-amps have a disable pin. It seems that if I disable the op-amp
then the signal goes straight through the input and feedback resistors
and on to the next stage without gain. That's handy as I can control
the disable pins with a spare uC output.
As long as the signal doesn't exceed the supply at the op-amp pins, that
should work fine. Shouldn't it?
Cheers