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Investing voltage follower op

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So the question is - how to build a Voltage Follower for biasing the negative feedback loop of op-amp? Mimicking means: 1 Possibility to use large value resistors to decrease power consumption 2 Do not change the gain of non-inverting amplifier.

Note that there is no drain resistor at the top and that the output is taken from the source terminal rather than the drain. This may be somewhere around 5V depending on the device, so one might reasonable choose a BJT emitter follower instead:. You can see the circuit is essentially identical excepting the transistor type. The input impedance of an emitter follower is relatively high, and it's output impedance is relatively low. So placed between a resistive voltage divider and the rest of the circuit such as an amplifier input has the effect of stabilizing the bias voltage developed across the divider against variation due to changes in current drawn from the divider.

The above answer is completely correct This works by essentially doing another voltage follower after the first one, but with the opposite "type". In this way the voltage is cancelled out. Sign up to join this community. The best answers are voted up and rise to the top.

Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more. Asked 5 years, 9 months ago. Modified 5 years, 9 months ago. Viewed 5k times. Quoting from there: Voltage Follower Biasing: This method is exactly the same as the voltage divider biasing, except it uses an op-amp or transistor to buffer the bias voltage, so choosing small resistor values is no longer necessary. The schematics for op-amp voltage follower for biasing is provided: Then we feed the bias voltage instead of ground in negative feedback loop of non-inverting amplifier: But there is no schematic in the document for voltage follower using transistor.

The I tried to design my own circuit to mimic op-amp voltage follower, I came up with something like this: simulate this circuit — Schematic created using CircuitLab The Vbias as with op-amp circuit goes to negative loop instead ground. ScienceSamovar ScienceSamovar 1, 2 2 gold badges 19 19 silver badges 37 37 bronze badges.

In your first diagram, the capacitive load on the op-amp is likely to degrade the circuit's stability or lead to oscillation. Your third diagram is not a follower, but a common-source amplifier, which is an inverting configuration. Your fourth diagram drives the amplifier input outside the power supply rail, so it is not likely to work very well.

Add a comment. Sorted by: Reset to default. Highest score default Date modified newest first Date created oldest first. A source follower looks like this: Note that there is no drain resistor at the top and that the output is taken from the source terminal rather than the drain.

This may be somewhere around 5V depending on the device, so one might reasonable choose a BJT emitter follower instead: You can see the circuit is essentially identical excepting the transistor type. Or do I understand something incorrectly? So in series with your R1 it will not change current in the feedback much by resistance contribution.

You'd need to analyze and simulate to get an idea and strike a balance. And if I use small value resistor Re - I do not save power, so I might as well use simple voltage divider or op-amp buffer, transistor follower this one is least favorable way. In an operational amplifier, negative feedback is implemented by feeding a portion of the output signal through an external feedback resistor and back to the inverting input see Figure 3. Negative feedback is used to stabilize the gain. This is because the internal op amp components may vary substantially due to process shifts, temperature changes, voltage changes, and other factors.

The closed-loop gain can be calculated with Equation 2 :. There are many advantages to using an operational amplifier. Op amps have a broad range of usages, and as such are a key building block in many analog applications — including filter designs, voltage buffers, comparator circuits, and many others. In addition, most companies provide simulation support, such as PSPICE models, for designers to validate their operational amplifier designs before building real designs.

The limitations to using operational amplifiers include the fact they are analog circuits, and require a designer that understands analog fundamentals such as loading, frequency response, and stability. It is not uncommon to design a seemingly simple op amp circuit, only to turn it on and find that it is oscillating. Due to some of the key parameters discussed earlier, the designer must understand how those parameters play into their design, which typically means the designer must have a moderate to high level of analog design experience.

There are several different op amp circuits, each differing in function. The most common topologies are described below. The most basic operational amplifier circuit is a voltage follower see Figure 4. This circuit does not generally require external components, and provides high input impedance and low output impedance, which makes it a useful buffer. Because the voltage input and output are equal, changes to the input produce equivalent changes to the output voltage. The most common op amp used in electronic devices are voltage amplifiers, which increase the output voltage magnitude.

Inverting and non-inverting configurations are the two most common amplifier configurations. Both of these topologies are closed-loop meaning that there is feedback from the output back to the input terminals , and thus voltage gain is set by a ratio of the two resistors. In inverting operational amplifiers, the op amp forces the negative terminal to equal the positive terminal, which is commonly ground.

In this configuration, the same current flows through R2 to the output. The current flowing from the negative terminal through R2 creates an inverted voltage polarity with respect to V IN. This is why these op amps are labeled with an inverting configuration.

V OUT can be calculated with Equation 3 :. The operational amplifier forces the inverting - terminal voltage to equal the input voltage, which creates a current flow through the feedback resistors. The output voltage is always in phase with the input voltage, which is why this topology is known as non-inverting. Note that with a non-inverting amplifier, the voltage gain is always greater than 1, which is not always the case with the inverting configurations.

VOUT can be calculated with Equation 4 :. An operational amplifier voltage comparator compares voltage inputs, and drives the output to the supply rail of whichever input is higher. This configuration is considered open-loop operation because there is no feedback. Voltage comparators have the benefit of operating much faster than the closed-loop topologies discussed above see Figure 7. The section below discusses certain considerations when selecting the proper operational amplifier for your application.

Firstly, choose an op amp that can support your expected operating voltage range. A negative supply is useful if the output needs to support negative voltages. If your application needs to support higher frequencies, or requires a higher performance and reduced distortion, consider op amps with higher GBPs.

One should also consider the power consumption, as certain applications may require low-power operation. Power consumption can also be estimated from the product of the supply current and supply voltage. Generally, op amps with lower supply currents have lower GBP, and correspond with lower circuit performance.

Operational amplifiers are widely used in many analog and power applications. The benefits of using an op amp are that they are generally widely understood, well-documented and supported, and are fairly easy to use and implement. Op amps are useful for many applications, such as voltage buffers, creating analog filters, and threshold detectors. With a greater understanding of key parameters and common topologies related to operational amplifiers, you can begin implementing them in your circuits.

Did you find this interesting? Get valuable resources straight to your inbox - sent out once per month! It has three built-in current-sense amplifiers. What is the range of frequency char The Input to this is the voltage acr Session popupval Session textval Session Titefor popup.

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In this way the voltage is cancelled out. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more. Asked 5 years, 9 months ago. Modified 5 years, 9 months ago. Viewed 5k times.

Quoting from there: Voltage Follower Biasing: This method is exactly the same as the voltage divider biasing, except it uses an op-amp or transistor to buffer the bias voltage, so choosing small resistor values is no longer necessary. The schematics for op-amp voltage follower for biasing is provided: Then we feed the bias voltage instead of ground in negative feedback loop of non-inverting amplifier: But there is no schematic in the document for voltage follower using transistor.

The I tried to design my own circuit to mimic op-amp voltage follower, I came up with something like this: simulate this circuit — Schematic created using CircuitLab The Vbias as with op-amp circuit goes to negative loop instead ground. ScienceSamovar ScienceSamovar 1, 2 2 gold badges 19 19 silver badges 37 37 bronze badges.

In your first diagram, the capacitive load on the op-amp is likely to degrade the circuit's stability or lead to oscillation. Your third diagram is not a follower, but a common-source amplifier, which is an inverting configuration. Your fourth diagram drives the amplifier input outside the power supply rail, so it is not likely to work very well.

Add a comment. Sorted by: Reset to default. Highest score default Date modified newest first Date created oldest first. A source follower looks like this: Note that there is no drain resistor at the top and that the output is taken from the source terminal rather than the drain. This may be somewhere around 5V depending on the device, so one might reasonable choose a BJT emitter follower instead: You can see the circuit is essentially identical excepting the transistor type.

Or do I understand something incorrectly? So in series with your R1 it will not change current in the feedback much by resistance contribution. You'd need to analyze and simulate to get an idea and strike a balance. And if I use small value resistor Re - I do not save power, so I might as well use simple voltage divider or op-amp buffer, transistor follower this one is least favorable way. However, keep in mind that an op amp will also draw current and therefore consume power.

Also, note that like The Photon mentioned, a capacitor on the op amp output is going to degrade its stability and perhaps cause it to oscillate. So such a circuit may require more components than you've shown so far. Show 1 more comment. Andrew Spott Andrew Spott 1, 8 8 silver badges 21 21 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. With these features, the circuit opts for various kinds of applications that need isolation in between input and output signals.

A basic voltage follower circuit is shown as follows:. When the op-amp functions like an open-loop amplifier which means without having a negative feedback connection, there is a minimal rise in the input voltage which leads to more increase in the output voltage level as because op-amp has increased gain. With the negative feedback in the voltage follower, it generates a compensating effect which makes the increased output voltage value to deliver across the negative terminal of the differential input section, and correspondingly there is a decrease in the output voltage.

The final impact of negative feedback in this circuit is to trigger the output voltage to be equal to the input voltage valve at the non-inverting input end. Here, one can observe directly that signal and input signals are equal. Though, the settling activity is clear when there is an application of quick transition to the voltage follower circuit. The below graph depicts the setting behavior of the circuit. Setting Behaviour. With this one might be in the thought that does this kind of circuit is useful in any application.

Let us now know the detailed scenario behind the purpose of voltage follower and how it is arranged to suit various applications. When there is the transmission of the voltage signal from one sub-circuit to another, the output impedance of the source and the input impedance of the load sub-circuits have to be considered. This forms a voltage divider and correspondingly the voltage transfer level is based on the proportion of input and output impedance values.

For effective voltage transfer, there is a need for a source circuit having minimal output impedance and a load circuit having high input impedance values. This kind of arrangement is simple and suitable to solve complicated impedance relationships. When there happens signal transfer from high-output impedance sub-circuit to low-input impedance sub-circuit, then the voltage follower that is in between these sub-circuits makes sure that there is the complete transfer of voltage to the load section.

Here, a resistive voltage divider delivers reference voltage V REF , however, the output impedance is not minimal mainly when the high-value resistors are employed in the approach of decreasing current utilization. It is known that everyone uses a voltage follower circuit to generate an output signal following the input signal.

Because the device is easily vulnerable to oscillations and this shows an impact on the voltage follower stability. Oscillations in the negative feedback connected amplifiers are correspondent to the phase shift where this triggers negative feedback to turn into positive feedback. It might be thought that voltage follower will not have any kind of stability issues because the device will not do any amplification.

But these circuits are easily reactive towards oscillations than any other circuits having higher gain values. In many of the scenarios, it is needed to eliminate oscillation in the circuits and the operational amplifier is selected that has unit gain stability.

These operational amplifiers are internally compensated in the way that they generate a frequency response which permits for good stability even when the machine is utilized in any of the voltage-follower configured devices. The gain of voltage follower is one where because the name itself and the functionality states that output voltage is followed with the input voltage.

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Question is based on this document. Voltage Follower Biasing: This method is exactly the same as the voltage divider biasing, except it uses an op-amp or transistor to buffer the bias voltage, so choosing small resistor values is no longer necessary. The schematics for op-amp voltage follower for biasing is provided:. Then we feed the bias voltage instead of ground in negative feedback loop of non-inverting amplifier:.

I've tried to find circuit on internet, but it seems most of the time it is different type of voltage follower, e. From my understanding this is not going to work for biasing non-inverting op-amp, since we take voltage from resistor i. The I tried to design my own circuit to mimic op-amp voltage follower, I came up with something like this:. The Vbias as with op-amp circuit goes to negative loop instead ground. But this does not work, the behavior is somewhat random, signal jumps around, etc.

The logic I was using is that we need to have capacitor on the output to prevent gain from changing because we don't introduce resistors to the loop. I tried different caps and resistors values, but nothing changes, so basically my circuit is wrong fundamentally.

So the question is - how to build a Voltage Follower for biasing the negative feedback loop of op-amp? Mimicking means: 1 Possibility to use large value resistors to decrease power consumption 2 Do not change the gain of non-inverting amplifier. Note that there is no drain resistor at the top and that the output is taken from the source terminal rather than the drain.

This may be somewhere around 5V depending on the device, so one might reasonable choose a BJT emitter follower instead:. You can see the circuit is essentially identical excepting the transistor type. The input impedance of an emitter follower is relatively high, and it's output impedance is relatively low. So placed between a resistive voltage divider and the rest of the circuit such as an amplifier input has the effect of stabilizing the bias voltage developed across the divider against variation due to changes in current drawn from the divider.

The above answer is completely correct This works by essentially doing another voltage follower after the first one, but with the opposite "type". In this way the voltage is cancelled out. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge.

Create a free Team Why Teams? Learn more. Asked 5 years, 9 months ago. Modified 5 years, 9 months ago. Viewed 5k times. Quoting from there: Voltage Follower Biasing: This method is exactly the same as the voltage divider biasing, except it uses an op-amp or transistor to buffer the bias voltage, so choosing small resistor values is no longer necessary. The schematics for op-amp voltage follower for biasing is provided: Then we feed the bias voltage instead of ground in negative feedback loop of non-inverting amplifier: But there is no schematic in the document for voltage follower using transistor.

So, let us know how the arrangement can be done in a simpler way and also what is a voltage follower, how it works, and other considerations. There are many other names for a voltage follower circuit which are isolation amplifier, unity-gain amplifier, and buffer amplifier.

It is an operational amplifier circuit where the output and input voltages are equal. Because of this, a voltage follower op-amp will not amplify the input signal but has a gain of one. It provides only buffering but no amplification to the circuit and has a high level of impedance. With these features, the circuit opts for various kinds of applications that need isolation in between input and output signals. A basic voltage follower circuit is shown as follows:.

When the op-amp functions like an open-loop amplifier which means without having a negative feedback connection, there is a minimal rise in the input voltage which leads to more increase in the output voltage level as because op-amp has increased gain. With the negative feedback in the voltage follower, it generates a compensating effect which makes the increased output voltage value to deliver across the negative terminal of the differential input section, and correspondingly there is a decrease in the output voltage.

The final impact of negative feedback in this circuit is to trigger the output voltage to be equal to the input voltage valve at the non-inverting input end. Here, one can observe directly that signal and input signals are equal. Though, the settling activity is clear when there is an application of quick transition to the voltage follower circuit. The below graph depicts the setting behavior of the circuit.

Setting Behaviour. With this one might be in the thought that does this kind of circuit is useful in any application. Let us now know the detailed scenario behind the purpose of voltage follower and how it is arranged to suit various applications. When there is the transmission of the voltage signal from one sub-circuit to another, the output impedance of the source and the input impedance of the load sub-circuits have to be considered.

This forms a voltage divider and correspondingly the voltage transfer level is based on the proportion of input and output impedance values. For effective voltage transfer, there is a need for a source circuit having minimal output impedance and a load circuit having high input impedance values. This kind of arrangement is simple and suitable to solve complicated impedance relationships.

When there happens signal transfer from high-output impedance sub-circuit to low-input impedance sub-circuit, then the voltage follower that is in between these sub-circuits makes sure that there is the complete transfer of voltage to the load section. Here, a resistive voltage divider delivers reference voltage V REF , however, the output impedance is not minimal mainly when the high-value resistors are employed in the approach of decreasing current utilization.

It is known that everyone uses a voltage follower circuit to generate an output signal following the input signal. Because the device is easily vulnerable to oscillations and this shows an impact on the voltage follower stability. Oscillations in the negative feedback connected amplifiers are correspondent to the phase shift where this triggers negative feedback to turn into positive feedback.

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Op Amp as Buffer - voltage follower

This feedback connection between the output and the inverting input terminal forces the differential input voltage towards zero. This effect produces a closed. Voltage Follower Biasing: This method is exactly the same as the voltage divider biasing, except it uses an op-amp (or transistor) to buffer. This isn't a voltage follower, it's not an integrator either. It's not clear what the circuit does. Note the opamp negative input always.