Introduction Log and Antilog Amplifiers are non-linear circuits in which the output voltage is proportional to the logarithm (or exponent) of the input. Log and Antilog Amplifiers are non-linear circuits in which the output voltage is proportional to the logarithm (or exponent) of the input. ❖ It is well known that. 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.
|Published (Last):||18 October 2004|
|PDF File Size:||7.87 Mb|
|ePub File Size:||10.53 Mb|
|Price:||Free* [*Free Regsitration Required]|
I know there is problem with the last stage, the last opamp should give me gain: 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. This can be expressed as. A log amplifier is an amplifier for which the output voltage V out is K times the natural log angilog the input voltage V in.
Due to the virtual ground at the op amp differential input. Documents Flashcards Grammar checker. The circuit diagram of logarithmic amplifier is as shown below. A necessary condition for successful operation of a log amplifier is that the input voltage, V inis always positive.
Log And Anti Log Amplifiers
Constant terms are omitted for simplicity. Such circuit techniques are used in integrated log amps: The final output is developed by an inverting amplifier with a voltage gain of —K2. The reverse saturation current for the diode doubles for every ten degree Celsius rise in temperature.
Unclear what you’re asking. Your email address will not be published. Applying Antilog on both sides we get. A logarithmic amplifieror a log amplifieris an electronic circuit that produces an output that is proportional to the logarithm of the applied input.
Log amplifier – Wikipedia
The source impedance of voltage signals applied to the circuit must be small compared to R1. Automated Classification of internet video content. So, the voltage at the inverting input terminal will be zero volts.
It means zero volts is applied to its non-inverting input terminal. You have 4 volts and 5 volts as your inputs.
According to the virtual short conceptthe voltage at the inverting input terminal of op-amp will be antilob to the voltage present at its non-inverting input terminal. Sign up using Facebook. This may be ensured by using a rectifier and filter to condition the input signal before applying it to the amplifirrs amp input.
The output voltage is expressed as the natural log of the input voltage. Sign up using Email and Password. Leave a Reply Cancel reply Your email address will not be published. You can help Wikipedia by expanding it. Retrieved from ” https: The logarithmic circuit can be redrawn as follows. Then determines the required input bias current and offset must be to achieve this.
So, the voltage at its inverting input terminal will be zero volts. Log-Antilog Log and antilog amp circuits include the same elements but arranged in different feedback configurations.
Very similar question from a month ago: