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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Antilogarithmic amplifier is one whose output is antilogarithmic exponential of input. Like logarithmic amplifierantilogarithmic is also a non-linear amplifier. The circuit arrangement for Antilogarithmic amplifier is illustrated in figure 1.

Log And Anti Log Amplifiers

Here a general purpose NPN transistor is connected to inverting input of op-amp. A resistor is connected in feedback path.

The output is depending upon output current of transistor and feedback resistor. As we know that.

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Thus, we can write. Now putting the value of collector current of transistor I C in equation 1. The output voltage expression becomes.

From the figure we can also conclude that transistor base emitter voltage V BE is equivalent input voltage V i i. The figure of anti-logarithmic amplifier using matched diode is shown in figure below. 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 antklog bias mood as shown in figure 2. Voltage at inverting pin of op-amp A1 is potentially equal to voltage at non-inverting input of op-amp i.

Assuming both diode and matched thus material constant, thermal voltage of diode and saturation current of diode is also same. The figure of anti-logarithm amplifier is shown in figure 3. 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.

Antilogarithmic Amplifier | Derivation

Assuming both transistors are matched. Thus, thermal voltage of 1 st transistor will be same to thermal voltage of 2 nd transistor and saturation current of 1 ap transistor will be equal to saturation current of 2 nd transistor.

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As we know that is very small.

Thus we can write. I edit and author this site. You can connect with me on: Google Plus and Facebook.

Linear Integrated Circuits Applications Log And Anti Log Amplifiers

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