# Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

1
Favorite
28
Copy
10292
Views  ## Circuit Description Circuit Graph

The circuit is a modification of an op-amp inverting amplifier, replacing the input resistor with a diode to create an inverting antilogarithmic/exponential amplifier. This variant is for processing positive input voltage and the output is a negative voltage. Note: Rf has a very low value of 20 Ω, this was done because of an effort to find suitable scaling of the input and output voltages so that their simultaneous graphs can be conveniently viewed. Moreover, the graph should convey insight about the antilogarithmic/exponential relation between the output and input voltages. The magnitude of Vin was limited so that the current through the diode will not exceed its maximum rating when the magnitude of the input voltage goes to its maximum. Then the value of Rf was determined so that the expected maximum value of the magnitude of the output voltage is about at the same scale as the maximum value of the magnitude of the input voltage.

### Shashank08 says:

Respected Sir,
Thank you for this wonderful circuit design.

### GGoodwin says:

Thank you for your wonderful comment. ## mcscorus

19 favorites ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

mandy26 ## Sine Wave Distortion Circuit Using Exponential Amplifier

pz201 ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

Mayankk123 ## antilog amp

ghala ## Antilog (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

Tushar_Jain_07 ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output) (1)

Mayankk123 ## Inverting Amplifier

kumark86 ## Copy of Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

KingKingKing ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

ghala ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

shashank4717 ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

911kishan ## ANTILOG AMPLIFIER -- TANYA

TANYA29 ## Copy of Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

n278957 ## Analog divider

202201AbhishekRaj ## Scaling Amplifier

DHRUV12 ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

puja1810 ## Exp 9 Antilogarithmic Amplifier AC Lab

Jyoti04 ## Copy of Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

BhagyeshChaudhari  ## 19BEC055_19BEC023_Anti-Logarthmic_OPAMP

Sneh33 ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

Pandiaraj ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

manjima202131 ## Antilog Amplifier

Raghav1198 ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

Paldy ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

Sirhio ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output)

bhartesh12 ## Antilogarithmic (Exponential) Amplifier (Diode Input, Positive Input - Negative Output) sittichot01

## Creator

1116 Circuits

### Date Created

6 years, 8 months ago