In this lecture the frequency response of Open Loop Configuration of Opamp is discussed in detail
Part-1
1.Definition
2.Need of Frequency Response
3.Frequency response of Open loop configuration
4.Observations from Frequency Response curve
1.Definition
The variation of gain of operational amplifier with respect to frequency is
called Frequency Response of OPAMP
Categories:
1.Magnitude Response
2.Phase response
Depending on configuration:
Frequency Response of Open loop configuration
Frequency Response of Closed loop configuration
Unity gain Bandwidth(UGB) or Unity gain cross over frequency
It is the frequency at which IAI =1
Observations from frequency Response curve :
1.The frequency at which the Gain falls by 3dB from its zero frequency value is called cutoff or break or corner frequency.
2.At cutoff frequency the gain starts falling and it falls by 20dB for every 10 times increase in frequency.
3.The gain roll off rate is -20dB/decade.
4.The frequency at which gain reduces to 0 dB is called UGB or Closed loop bandwidth of opamp.
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