I've been given a task to design three types of transimpedance amp....

A single transistor amplifier with local feedback - This is where I'm stuck.
The output value I'm getting from the circuit simulation isn't == Rf x Iin

My knowledge on amplifiers is extremely narrow, so maybe this is why I'm going wrong... But I have created a common emitter amp, sampling the output feeding it across a resistor and then back into the input.

Is this incorrect?

 

Just for the sake of completeness, there should be a minus sign in front of Rf. Maybe that is the issue.

 

I wish it was as simple as that, the output is completely different as to what I expected


Oscilliscope output


Circuit


I was under the impression that the oscilloscope should be reading 10kv instead of an offset wave with peak around 2kv and trough -2.7kv

 

I wish it was as simple as that, the output is completely different as to what I expected


Oscilliscope output


Circuit


I was under the impression that the oscilloscope should be reading 10kv instead of an offset wave with peak around 2kv and trough -2.7kv

I think I see the problem. You don't need R1. And, therefore, you probably calculated wrong R2.

Let me find some links I was reading while I was thinking about your first post.

 

Here: http://www9.dw-world.de/rtc/infotheque/semiconamps/semiconductor_amps2.html
Scroll down to Section 2.1.4, then to Figure 2.1.4.2 It shows how to setup voltage feedback bjt and how to calculate the resistor values.

 

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