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Is there any difference between normal op amp and trans impedance amplifier. What are pros / cons? Can we replace trans impedance amplifier with normal op amp.
1.) The inverting input of the TIA is low-resistive (other name: Current-feedback amplifier);
2.) Open-loop "gain" is Vout/inout current: Transresistance;
3.) Due to stability there is a lower limit for the feedback resistor (specified by the manufacturer, range: 0.5...some kohms); no capacitive feedback allowed;
4.) The closed-loop bandwidth is (nearly) identical to the open-loop bandwidth;
5.) Very high slew rates (if compared with general-purpose classical voltage-feedback amps).
Replacement of TIAs (and vice versa) depends on the particular application.
You can configure an standard opamp to be a transimpedance amplifier, and a current feedback opamp to be a voltage amplifier. See any standard intro to opamp circuits; Google is your friend.
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