Transimpedance amplifier vs normal op-amp

Status
Not open for further replies.
V

vaibhavpawar

Junior Member level 1
Joined
Nov 9, 2014
Messages
19
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Visit site
Activity points
178
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.
 

Yes - there is.

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.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…