What does the Σ sign mean in electronics?
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
Sigma = summation of signals.... It can also mean to subtract signals if the sign in negative for 1 of the signals http://www.freepatentsonline.com/6920182-0-large.jpg
It often used with the inverting input of Op Amps as each resistor value controls the weighting value of gain for each input. However in the symbolic schematic it may be the + or - depending on how it is configured.
This method is commonly used in Signal Delta ADC's so that the difference is quantized on each sample for high speed , high resolution analog to digital conversion. The difference is then added (summed) to previous digital result.
These schematics are some examples of the use of Sigma.