Week 6 day 1 Inverting Voltage Amplifier

Lecture

First Problem calculating non-ideal negative feedback operational Amplifier with open loop gain of 200,000, the input resistance of 2 mega ohms and output resistance of 50 ohm:

We calculated again (v out over v source) of 2. Second Problem of our lecture, calculating non-ideal positive feedback operational amplifier. Here we have an identical amplifier but  our Voltage out is connected to the non-inverting voltage input:

We calculated a gain of 9 on our non-inverting op Amp:

Inverting Op Amp Lab

Pre-Lab: 

we calculated Theoretical saturation and Theoretical resistor needed to obtain a gain of 2 from inverting op Amp:

We measured our Actual 2K resistor and 4 K resistor :

Below are the theoretical and measured resistor : 

 Our OP 27 Amp, note that first terminal is marked with a circle

Zoom in Set up of out inverting amplifier circuit

 We Measured the voltage out put of our circuit with different value of input voltage :

We then Sketch the graph of V input and output :

Lastly, we use the waveform generator to scope our output voltage when we have a linear input :

 Summary :

Today we learn about operational Amplifier.  Operational Amplifier is a voltage controlled voltage source that can produce Voltage out using 6 mathematical operations (add, subtract, multiply, divide, integrate and differentiate) from Voltage input. The ability of an amplifier to produce amplified voltage is limited by its outside Voltage. The condition, where voltage out is equal to its external voltage, is called saturated voltage. Open loop Amplifier saturates really easy and therefore impractical.In order to actually have a significant voltage gain, but doesn't saturate really quickly we will use used feedback. In this class, we will use either negative feedback when voltage input is connected to the inverted voltage input, or positive feedback when voltage input is connected to the non-inverted voltage input.