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Viewed 9k times. Add a comment. Sorted by: Reset to default. Highest score default Date modified newest first Date created oldest first. Let's see if we can get that same answer from our first expression. Harry Svensson Harry Svensson 7, 3 3 gold badges 30 30 silver badges 51 51 bronze badges.
You denie yourself on next lines. Infact changing values to get the same gain has nothing to do with all the "benefits" like bandwidth, immettances and sensitivities improvements that higher loop gain could take in. Thanks for pointing that out. Say you have the following: simulate this circuit — Schematic created using CircuitLab OA1 is a bad op amp with an open loop gain of at DC.
Houston Fortney Houston Fortney 2, 1 1 gold badge 9 9 silver badges 14 14 bronze badges. So Bruce is correct. Consider the non-inverting op amp circuit shown in Figure 1: simulate this circuit — Schematic created using CircuitLab Figure 1.
Op amp non-inverting voltage amplifier circuit. Jim Fischer Jim Fischer 2, 9 9 silver badges 11 11 bronze badges. It works with. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Upcoming Events. Featured on Meta. Announcing the arrival of Valued Associate Dalmarus. Testing new traffic management tool.
Linked Related 4. Hot Network Questions. Question feed. According to the voltage divider formula, we can express the inverting voltage V — as a function of the output voltage and the resistances:. We can note that the ideal gain presented in Equation 2 is strictly positive and higher than 1, meaning that the output signal is amplified and in phase with the input signal.
Instead, the input impedance has a high but finite value , the output impedance has a low but non-zero value. The non-inverting configuration still remains the same as the one presented in Figure 1. Note that Ri and Ro can be described to be respectively the input and output impedances of the op-amp without any feedback loop open-loop configuration.
Finally, the closed-loop gain A CL for a real non-inverting configuration is given by Equation 4 :. For a real configuration, the gain not only depends on the resistor values but also on the open-loop gain. As a consequence, Equation 4 is simplified back to Equation 2. Even if for real op-amps, a small leaking current enters the inverting input, it is several orders of magnitude smaller than the feedback current. The current I 0 across R 0 see Figure 3 can be expressed as a function of the voltage drop across R 0 and the same value of the impedance R 0 :.
A simplified version for the expression of Z out is given by the following Equation 6 :. It can be shown that the expression of the input impedance can also be written as a function of the feedback factor:. The most simple designs for non-inverting configurations are buffers, which have been described in the previous tutorial Op-amp Building Blocks. Its high input impedance and low output impedance are very useful to establish a load match between circuits and make the buffer to act as an ideal voltage source.
We consider a real non-inverting configuration circuit given in Figure 5 :. The resistors, input value, and gain in open-loop are given such as:. First of all, we can compute the value of the closed-loop gain A CL. We can remark that both values are very similar since A OL is high. The currents I R1 across R 1 and I R 2 across R 2 are approximately equal if we consider the leaking current in the inverting input to be much lower than the feedback current.
The design and main properties of this configuration are presented in the first section that presents its ideal model. In the second section, the real non-inverting op-amps are presented. Due to the parasitic phenomena that are intrinsic to their design, their properties change, the expression of the closed-loop gain, input, and output impedances are different. However, the simplified version of these formulas that describe the ideal model can indeed be recovered when we set the open-loop gain to be infinite.
Problem: Find actual gain and gain error for an amplifier. • Given data: Ideal closed-loop gain of (46 dB), open-loop gain of op amp is 10, (80 dB). Gain Error is given by. GE= (ideal gain)-(actual gain). For non-inverting amplifier,. Gain error is also expressed as a fractional or percentage error. For formula they have taken this part of the equation: . R1R1+R2. And divided top and bottom by R1 to get this: . 11+R2R1.