Correct Answer - Option 1 : Infinity
The gain of an ideal amplifier must be Infinity.
|
Characteristic
|
Value
|
|
Open Loop Gain (A)
|
∞
|
|
Input Resistance
|
∞
|
|
Output Resistance
|
0
|
|
Bandwidth of Operation
|
∞
|
|
Offset Voltage
|
0
|
|
Noise factor
|
0 dB
|
The ideal op-amp has the following characteristics:
- Input impedance (Differential or Common-mode) = Infinity
- Output impedance (open loop) = 0
- Voltage gain = Infinity
- Infinite Bandwidth
- Common-mode voltage gain = 0
- Vout = 0 when both inputs are at the same voltage, i.e. (zero "offset voltage")
- Output can change instantaneously (Infinite Slew Rate)
- The purpose of bias current is to achieve the ideal behavior in op-amp which is high CMRR, high differential gain, and high input impedance
