A summer is a mixer. A mixer is an opamp with a voltage gain of a few hundred thousand as an inverting low gain circuit. Each input has a series resistor to the inverting input of the opamp and the output has the same value resistor to the inverting input to make the gain 1. Nothing is supposed to saturate because it is linear.
This mixer circuit needs to have a plus and minus supply:
A summer is a mixer.
No, he is right, a mixer is a summing amplifier....a mixer?
I don`t think so. The classical task of a mixer is to multiply signals.
So my summer is taking inputs between -1v and 1v and the output is somewhere in that range as well. Am I not able to use this architecture then?
Most opamps have DC and low frequency voltage gain 2000 times more than yours.
Your opamp is shown without any negative feedback and its (+) input has no DC reference voltage.
Since your input is between -1V and +1V and you want the output to be the same then Vdd must be a positive power supply voltage, Vss must be a negative power supply voltage and their junction 0V must be the input and output grounds.
Since your output is a class-A Mosfet feeding a current source then it can pull strongly positively but not negatively. Therefore its output resistance is high and its output swing is determined by its current and its load resistance. Why doesn't your opamp have a push pull class-AB output like most other opamps?
Simply look at the datasheets of a few of the millions of opamps available (or ask your teacher to explain it).I'm sorry, how would I implement the push pull?
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