### 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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A resistor is connected in feedback path.

antilig Antilogarithmic amplifier is one whose output is antilogarithmic exponential of input. The electronic circuits which perform the mathematical operations such as logarithm and amplifiier exponential with an amplification are called as Logarithmic amplifier and Anti-Logarithmic amplifier respectively. Using the concept of virtual short between the input terminals of an opamp the voltage at inverting terminal will be zero volts. The circuit diagram of logarithmic amplifier is as shown below.

Best Arduino Projects 2. Electronic Game and Fun Projects. Logarithmic amplifier gives the output proportional to the logarithm of input signal. The anti log amplifier can be redrawn as follows.

Assuming both transistors are matched. Applying Antilog on both sides we get. Logarithmic amplifier operation The circuit diagram of logarithmic amplifier is as shown below natilog amplifier. Thus we can write.

So, the voltage at the inverting input terminal will be zero volts. Project Using and 4.

As we know that. Thus, we can write. In the circuit shown above, the non-inverting input terminal of the op-amp is connected to ground.

Gain of logarithmic amplifier. Easy Electronic Projects 5. If you have any comments or suggestions please use our contact page We strictly ignore emails regarding post helps or explanation of circuits and projects ; for those purpose please use our comment feature ; We will surely help you by replying to your comment; It may helps other too.

The o of anti-logarithm amplifier is shown in figure 3.

You May Also Like. Now putting the value of collector current of transistor I C in equation 1. In the above circuit, the non-inverting input terminal of the op-amp is connected to ground. Google Plus and Facebook. Voltage at inverting pin of op-amp A1 is potentially equal to voltage at non-inverting input of op-amp i.

This chapter discusses akplifier the Logarithmic amplifier and Anti-Logarithmic amplifier in detail.

### Basic Antilog Amplifier Using Diode – EEEGUIDE

Since the non inverting terminal of opamp is at ground potential. 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. That means zero volts is applied at the non-inverting input terminal of the op-amp. An usinh 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.

I edit and author this site. So, the voltage at its inverting input terminal will be zero usig.

## logarthmic, anti logarthmic amplifiers

Leave a Reply Cancel reply Your email address will not be published. The logarithmic circuit can be redrawn as follows. Observe that the left hand side terms of both equation 1 and equation 3 are same. Complete Electrical Symbol 3. Please note that these amplifiers fall under non-linear applications. As we know that is very small. 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.

Applying KCL at inverting node of opamp we get. It is obvious from the circuit shown above that negative feedback is provided from output to inverting terminal. V is voltage applied across diode; V t is the voltage equivalent of temperature. 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.

This section discusses about the op-amp based logarithmic amplifier in detail. Anti log amplifier is one which provides output proportional to the anti log i. Gain of Anti log amplifier. A logarithmic amplifieror a log amplifieris an electronic circuit that produces an output that is proportional to the logarithm of the applied input. This section discusses about the op-amp based anti-logarithmic amplifier in detail.