- #1
Mindscrape
- 1,861
- 1
What does it mean when an op amp has only a minus sign in its symbol? Is the positive terminal at ground, or is it at some arbitrary voltage?
Mindscrape said:What does it mean when an op amp has only a minus sign in its symbol? Is the positive terminal at ground, or is it at some arbitrary voltage?
Mindscrape said:Here is the lead circuit, sorry for the cartoony look. I solved for it if v+ were some arbitrary voltage because that seemed to be give the most useful transfer function, but I just don't have any idea what the symbol was supposed to mean.
Mindscrape said:Here is the lead circuit, sorry for the cartoony look. I solved for it if v+ were some arbitrary voltage because that seemed to be give the most useful transfer function, but I just don't have any idea what the symbol was supposed to mean.
edmondng said:if i were to guess it would be non-inverting.
rbj said:no, i think it's inverting. the + terminal is connected to ground and it is not shown in the pic. I've seen this convention before and i have never liked it.
The minus sign symbol in an op amp circuit represents the inverting input terminal. This means that the input signal at this terminal will be inverted at the output.
The minus sign symbol is used to distinguish the inverting input from the non-inverting input in an op amp circuit. It is a standard convention and helps to avoid confusion when analyzing op amp circuits.
Yes, you can connect a signal to the minus sign input of an op amp. However, keep in mind that the signal will be inverted at the output. This is useful for certain applications, but if you want a non-inverting amplifier, you should connect the signal to the non-inverting input terminal.
No, the minus sign input is not always connected to ground in an op amp circuit. It can be connected to a voltage source or another input signal, depending on the desired circuit configuration. In some cases, it may also be left floating.
The minus sign input does not directly affect the gain of an op amp circuit. However, it does play a role in determining the overall feedback and gain of the circuit. In general, the gain of an inverting op amp circuit is equal to the ratio of the feedback resistor to the input resistor.