See Figure 1. Voltage follower implemented using opamp is shown in Fig 2. Voltage Follower is simply a circuit in which output follows the input, means output voltage remains same as input voltage. What is a Voltage Follower? The total remoteness of the signal supply from the output. The voltage follower does not need any external components. In other words, the gain of a voltage follower circuit is unity. FET is a voltage-controlled device with three terminals -source, drain, and gate. This article discusses an overview of voltage follower. Op Amp application as a Phase Shifter Voltage follower has application when the source voltage can not supply very much current, a pH meter for example. Very low output impedance. The overall loaded voltage gain is now 100, the unloaded voltage gain. Voltage gain without any kind of phase inversion. Large bandwidth. Based on these terminals, FET is divided into 3 amplifier configuration that corresponding to 3 configurations of Bipolar transistors. Voltage follower (unity buffer amplifier) Used as a buffer amplifier to eliminate loading effects (e.g., connecting a device with a high source impedance to a device with a low input impedance). A voltage follower is also known as a unity gain amplifier, a voltage buffer, or an isolation amplifier. Application- Voltage followers are placed between two networks to reduce the loading on the first network. They are common-source, common drain (source-follower), and common-gate amplifier circuits. Voltage follower can be defined as when the output of the op-amp circuit follows the input of the op-amp directly. 2. In a voltage follower circuit, the output voltage is equal to the input voltage; thus, it has a gain of one (unity) and does not amplify the incoming signal. +Vcc is the transistor’s collector voltage, Vin is the input voltage, Vout is the output voltage and Re is the transistors emitter resistor. Very high input impedance. However, by inserting an (ideal) voltage follower between the amplifier and the load: simulate this circuit. So both the input and output voltages are the same. The follower has a very high input impedance. Answer: The important features of the voltage follower circuit are as follows- Closed loop voltage gain is equal to 1, i.e output is equal to input with no phase shift. Voltage follower is one of the simplest uses of an operational amplifier, where the output voltage is exactly same as the input voltage applied to the circuit. Voltage Follower This is a special case of the non-inverting amplifier with Rin → ∞ and Rf = 0. So, this application will describe the most frequent ones, used in most of the cases. Current-to-Voltage Converter (AKA, I-V Converter, Transimpedance Amplifier). This may seem paradoxical since the voltage follower has a voltage gain of 1 but remember, the voltage follower is still an amplifier. Voltage follower using BJT is also known as emitter follower. In transistor equivalent, there are minimum 2 transistor stages needed to do this. Easily adaptable voltage gain. High input impedance compared to Inverting input. Buffer (follower) circuit Design Steps ... • Review the Output Voltage versus Output Current curves in the product datasheet to verify the desired output voltage can be achieved for the desired output current. 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