Re: Analog switch configuration

I was actually contemplating using only one switch. But I wondered if
using only one switch will decrease the switch isolation. I was doing
some initial simulation on PSpice using a similar circuit above and
using another analog switch. The results indicated that there were some
coupling from the NO to the NC terminal.

what effect would that crosstalk have in this circuit?
there may be some tiny reduction in amplitude, but would it do anything else?

Also, I was thinking that with the configuration above the inverting
opamp would still be inverting a signal even if its function is not
required. Wouldn't this be unwanted excess power?

yes, but if you switch the input to the inveryer off it'll bounce round a
bit when you switch it back on.

using larger resistances will reduce the power needs but may increase
distortion,

if you can arrange to switch the front switch on before the back one and off
after it that could reduce power consumption.

how much power does the switch need to operate?

conversely there may be a way to confiure your next stage to invert or not
and reduce this stage to a single analogue switch. which just reconfigures the
next stage....

Bye.
Jasen
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