# LOG AND ANTILOG AMPLIFIER PDF

Antilog amplifiers along with log amplifiers are used to perform analogue computations on the input signals. The circuit of an antilog amplifier. But if diode current is too low then the OP Amp input offsets become Then finally choose a max temp difference of the log and antilog diodes. EXPERIMENT 8: Log and Antilog Amplifiers. Objectives: To understand the behavior of logarithmic and antilogarithmic amplifiers. Materials and Equipment.

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V is voltage applied across diode; V t is the voltage equivalent of temperature. So, the voltage at the inverting input terminal will be zero volts. Hence applying KCL at inverting antilkg of opamp, we get.

Then verify your design specs with sweeping voltages on the inputs and compute the gain and offset errors vs input. Figure next slide shows the use of a second, matched, transistor for offset compensation and ,og temperature-dependent gain for gain compensation. An anti-logarithmic amplifieror an anti-log amplifieris an electronic circuit that produces an output that is proportional to the anti-logarithm of the applied input. I’m trying to build an analog multiplier that takes any two voltages and produces the product for them This is the basic layout of the circuit: Automated Classification of internet video content.

It means zero volts is applied to its non-inverting input terminal.

### Log and AntiLog Amplifiers

Omitting R1 yields a currentinput log amp. Consider the voltage-input transdiode.

Amplifler to the virtual short conceptthe voltage at the inverting input terminal of an op-amp will be equal to the voltage at its non-inverting input terminal. The diode dynamic resistance also drops with rising log current until saturated where the bulk resistance limits the minimum resistance.

ANTONIO BLAY LECTURA RAPIDA PDF

A logarithmic amplifieror a log amplifierampliifer an electronic circuit that produces an output that is proportional to the logarithm of the applied input. Negative voltages or currents can be first rectified and then applied to the log amp, but this adds the errors from the rectifier.

I know there is problem with the last stage, the last opamp should give me gain: Using a p-n-p transistor changes the polarity of input signals acceptable but limits the logarithmic range because of the degraded amd of p-n-p transistors compared to n-p-n transistors www.

This relationship is shown in the following formula: Observe that the left hand side terms of both equation 1 and equation 3 are same.

## Log And Anti Log Amplifiers

This is the basic layout of the circuit: Documents Flashcards Grammar checker. One usually starts with a spec for Input and Output voltage range antiolg max error vs input. Alternatively, the log amp can be preceded by a precision current inverter.

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