ANTILOG AMPLIFIER USING OP AMP PDF

a diode used in the feedback loop of an operational amplifier is forward biased by a constant current loop of an op-amp. Antilog is inverse operation of log operation so; antilog amplifiers can be operation. Log Amplifier using Diode. Fig 1. Antilogarithmic Amplifier using Single Transistor. The circuit Here a general purpose NPN transistor is connected to inverting input of op-amp. Basic Antilog Amplifier Using Diode The circuit diagram of basic antilog amplifier using diode As op-amp input current is zero, the current I must be same as If.

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The logarithmic circuit can be redrawn as follows. From the figure we can also conclude that transistor base emitter voltage V BE is equivalent input voltage V i i. A logarithmic amplifieror a log amplifieris an electronic circuit that produces an output that is proportional to natilog logarithm of the applied input.

V is voltage applied across diode; V t is the voltage equivalent of temperature. Electronic Game and Fun Projects. Complete Electrical Symbol 3. In the circuit shown above, the non-inverting input terminal of the op-amp is connected to ground. As we know that. The figure of anti-logarithmic amplifier using matched diode is shown in figure below. Applying Antilog on both sides we get.

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Two matched transistors is used here as shown in figure, where input is given to the non-inverting amplifier pin of first op-amplifier A1. Best Arduino Projects 2.

Antilogarithmic Amplifier | Derivation

That means zero volts is applied at the non-inverting input terminal of the op-amp. Using the concept of virtual zmplifier between the input terminals of an opamp the voltage at inverting terminal will be zero volts. Voltage at inverting pin of op-amp A1 is potentially equal to voltage at non-inverting input of op-amp i.

Since the non inverting terminal of opamp is at ground potential.

Log And Anti Log Amplifiers

Here a general purpose NPN transistor is connected to inverting input of op-amp. Thus, we can write.

Assuming both transistors are matched. Project Using and 4. Two matched diodes are used here, where one diode D 1 is connected in feedback path and second diode D 2 is connected to inverting input of op-amp A2 in reverse bias mood as shown in figure 2. Anyilog putting the value of collector current of transistor I C in equation 1.

An op-amp based anti-logarithmic amplifier produces a voltage at the output, which is proportional to the anti-logarithm of the voltage that is applied to the diode connected to its inverting terminal.

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Your email address will not be published. You May Also Like. You can connect with me on: Observe that the left hand side terms of both equation 1 and equation 3 are same. Google Plus and Facebook. The circuit arrangement for Antilogarithmic amplifier is illustrated in figure 1.

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The anti log amplifier can be redrawn as follows. Gain of Anti log amplifier.

This chapter discusses about the Logarithmic amplifier and Anti-Logarithmic amplifier in detail. Applying KCL at inverting node of opamp we get. This section discusses about the op-amp based logarithmic amplifier in detail.

The figure of anti-logarithm amplifier is shown in figure 3. Like logarithmic amplifierantilogarithmic is also a non-linear amplifier.

An op-amp based logarithmic amplifier produces a voltage at the output, which is proportional to the logarithm of the voltage applied to the resistor connected to its inverting terminal.