"a single-stage summing amplifier inverts the signal"
One can use a Non-inverting summing amplifier to address that.
http://masteringelectronicsdesign.com/the-transfer-function-of-the-summing-amplifier-with-n-input-signals/
"a single-stage summing amplifier inverts the signal"
One can use a Non-inverting summing amplifier to address that.
http://masteringelectronicsdesign.com/the-transfer-function-of-the-summing-amplifier-with-n-input-signals/