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15 Threads found on edaboard.com: **Antilog**

log(V1/V2)=log(V1)-log(V2)=D
100***antilog**(D)=100*(V1/V2)
search for logarithmic and anti logarithmic amplifier circuits or ICs.

Analog Circuit Design :: 07-12-2014 23:51 :: Borber :: Replies: **1** :: Views: **466**

I don't see a log function plot in the third curve, only y = -exp(-x). It would be of course generated by an **antilog** circuit, as you apparently did. Nice try to fool people at edaboard.

Analog Circuit Design :: 05-22-2014 17:44 :: FvM :: Replies: **2** :: Views: **534**

I want to write verilog code ,of mathematical function like log(x),x^y,**antilog**(x),sin or cosine function....how i can write?

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 03-09-2014 22:26 :: rids1 :: Replies: **1** :: Views: **1472**

In Pspice, a square root circuit can be easily "designed" by using ABM (analog behaviour modelling).
For a real hardware circuit, you can refer to analog multipliers, see an example in the AD633 datasheet
Or use a suitable combination of log/**antilog** circuits. The basic conce

Microcontrollers :: 09-16-2012 17:50 :: FvM :: Replies: **1** :: Views: **1194**

The fast way is to...
take the logarithm of your number. (Any base)
Subtract from zero (the log of 1). Or change the sign.
Take the **antilog**.
This gives you the reciprocal of your original number.
It's easier if your pic has a logarithm table.

Microcontrollers :: 08-31-2012 04:02 :: BradtheRad :: Replies: **1** :: Views: **511**

There are basically two types of analog dividers:
- based on four quadrant multipliers (e.g. AD734)
- based on log/**antilog** circuits
The log/**antilog** designs are slower and restricted to single quadrant operation but offer a higher dynamic range. AD538 is an example of an integrated version, but this circuits can be also build from OPs and trans

Analog Circuit Design :: 08-05-2012 08:29 :: FvM :: Replies: **5** :: Views: **1216**

The log/**antilog** circuit doesn't work as shown and the transfer characteristic isn't calculated correctly. It would work for sqrt(x*y). But to calculate x*y, the adder must have a gain factor of 1 for both inputs. So the output has an unwanted offset of 1*Vbe. For a temperature indepent log/**antilog** multiplier, you need a third log stage with a const

Digital Signal Processing :: 01-30-2012 18:29 :: FvM :: Replies: **7** :: Views: **1586**

Hai all,
I am looking for Quad matched pair transistor for analog divition.
Need minimum 3 matched pair, two for log and one for **antilog**.
I found MAT14, Do you have any other part,
Thanks
Grittin

Analog Circuit Design :: 11-29-2011 06:09 :: grittinjames :: Replies: **2** :: Views: **851**

In logarithmic or **antilog**arithmic Amplifier using OPAMP (IC 741) sometimes we use a diode and sometimes we use a transistor..
Which one is mostly used??
Please explain..

Elementary Electronic Questions :: 05-11-2010 14:44 :: Anirban Mitra :: Replies: **0** :: Views: **3575**

an arithmetic divider that operates ideally at any frequency
Keep on dreaming.
From the existing analog multiplier/divider variants, only "gilbert cell" (gm multiplier) is wideband. Log/**antilog** offers higher dynamic range but
is restricted to MHz bandwidth at best, hall sensor multipliers (rather unusual) possibly achieve a sim

Analog Circuit Design :: 02-06-2010 12:19 :: FvM :: Replies: **11** :: Views: **6642**

can anyone say me how to realize log and **antilog** in same fpga hardware using lookup table(LUT),interpolation steps.please send me the codes and other detail to execute my final yr project.

PLD, SPLD, GAL, CPLD, FPGA Design :: 12-31-2009 06:05 :: simalneelifeld :: Replies: **0** :: Views: **1074**

hi!
i know of no paper but op amps with diodes produce nonlinear outputs. try searching for log and **antilog** amps in google. Ü
- al

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 04-13-2007 07:52 :: acbalbason :: Replies: **1** :: Views: **748**

Hi Abo_Ayat,
I assume you need "true" multiplication, i.e., not for
modulation/demodulation or similar applications.
One method is using logarithmic amplifiers for both signals, then summing and finally an **antilog** amplifier. This method uses Op Amps and external transistors.
Regards
Z

Analog Circuit Design :: 05-25-2006 18:43 :: zorro :: Replies: **11** :: Views: **13077**

Hi all, I have some questions related to log and **antilog**e amplifiers.
1- how does the log and **antilog** amplifier circuits look like?
2- what does the two circuits do?
3- how does the circuits work?
4- the applications of both log and **antilog** amplifiers?
5- examples of where we can find these circuits?
I hope to hear from you soon

Analog Circuit Design :: 10-18-2005 06:02 :: Y_me :: Replies: **2** :: Views: **3618**

hi there, please help me, what is wave form from the output signal of logarithmic amplifier and **antilog** amplifier? where do we use those kinds of amplifier? what makes them called logarithmic and **antilog** amplifiers?
thank you :)

Analog Circuit Design :: 09-28-2005 14:49 :: zhi_yi :: Replies: **10** :: Views: **10117**

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