LOG ANTILOG AMPLIFIERS PDF

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.

Author: Doll Kagasho
Country: Turkey
Language: English (Spanish)
Genre: Education
Published (Last): 19 January 2008
Pages: 443
PDF File Size: 18.59 Mb
ePub File Size: 10.70 Mb
ISBN: 886-1-60001-569-5
Downloads: 38161
Price: Free* [*Free Regsitration Required]
Uploader: Voodoojin

Log and AntiLog Amplifiers

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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: I know there is problem with the last stage, the last opamp should give me gain: The K values control the R value which controls the diode current which can lead to errors if there is self heating which is the NTC Shockley Effect. But if diode current is too low then the OP Amp input offsets become significant compared the the log1, log2 outputs. The diode dynamic resistance also drops with rising log current until saturated where the bulk resistance limits the minimum resistance.

  ENFERMEDAD DE VON GIERKE BIOQUIMICA PDF

The bulk size and Pd rating of amolifiers diode affects the thermal resistance and bulk resistance or ESR, and also junction capacitance and bandwidth.

Log and AntiLog Amplifiers

So this is another tradeoff for diode size vs bandwidth vs temp rise. One usually starts with a spec for Input and Output voltage range and max error vs input. Then determines the required input bias current and offset must be to achieve this. Then finally choose a max temp difference of the log and antilog diodes to avoid gain and offset errors. Matched temperature by thermal coupling is desired or minimize self heating for low T rise. But this depends on your thermal design. Then verify your design specs with sweeping voltages on the inputs and compute the gain and offset errors vs input.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Home Questions Tags Users Unanswered. 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: Very similar question from a month ago: SPICE simulation of voltage multiplier using log and antilog amplifier.

  CHNETWORK ORG READGUIDE04 PDF

Unclear what you’re asking. You’ve simulated amplifiwrs, so why do you ask if it works for you? Please think about what you are doing in your antllog. You have 4 volts and 5 volts as your inputs. Then a properly working multiplier should give you 20 volts out. Does this seem reasonable? Ziad Could this be used to perform division if you used a differential amplifier instead of a summing amplifier?

Tony EE rocketscientist 62k 2 21 Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

Email Required, but never shown. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie loyand that your continued use of the website is subject to these policies.

admin