Feedback resistor and capacitors: (Rf and Cf parallel)
They act upon the high frequency range limiting of the circuit. f2
Basically they form the LPF
Inverting Resistor and capacitors: (R1 and C1 series)
They form the HPF, with cut-off frequency f1
f1 < f2
Series C1 capacitor can be used to amplify only the AC signal at non-inverting terminal and avoid amplification of DC level.
A coupling capacitor Cc is also used at the output of opamp before connecting to next stage so that only the high frequency AC signal is coupled. This is useful to cut down the DC offset to be amplified from one stage to next stage.
And gain of the amplifier is decided by Rf and R1 = 1 + Rf/R1
As gain decreases, the bandwidth increases from both sides
If the C1 is not used, all DC signal is also amplified. So adding the capacitor series to R1 helps.
If needed add the DC level using voltage divider.
They act upon the high frequency range limiting of the circuit. f2
Basically they form the LPF
Inverting Resistor and capacitors: (R1 and C1 series)
They form the HPF, with cut-off frequency f1
f1 < f2
Series C1 capacitor can be used to amplify only the AC signal at non-inverting terminal and avoid amplification of DC level.
A coupling capacitor Cc is also used at the output of opamp before connecting to next stage so that only the high frequency AC signal is coupled. This is useful to cut down the DC offset to be amplified from one stage to next stage.
And gain of the amplifier is decided by Rf and R1 = 1 + Rf/R1
As gain decreases, the bandwidth increases from both sides
If the C1 is not used, all DC signal is also amplified. So adding the capacitor series to R1 helps.
If needed add the DC level using voltage divider.
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