The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> input impedance of voltage multiplier https://designers-guide.org/forum/YaBB.pl?num=1155910560 Message started by sriniv1422 on Aug 18th, 2006, 7:16am |
Title: input impedance of voltage multiplier Post by sriniv1422 on Aug 18th, 2006, 7:16am Hi all , Iam trying to simulate the Modified Greinacher voltage multiplier circuit( capacitor-diode series ) for RFID tags. This is being used for Livestock IDentification. The specs are as follows: load current: 50uA input power : 600uW.@50ohm. Iam using a matching network followed buy a two stage mulyiplier circuit. Iam trying to calculate the input impedace of the voltage multiplier ciruit , so that I can design the matching network. could you please let me know , what simulation techniques could be used to estimate the real and imaginary part of the input impedance. I have tried injecting an AC current and measuing the voltage .But these give me wrong results. Could you please let me know , how to set up the simulation , so that input impedance can be calculated after the circuit has reached steady state. I would really appreciate any info regarding this. thanks srinivasan. |
Title: Re: input impedance of voltage multiplier Post by gmadhavareddy on Sep 11th, 2006, 1:03pm Hi, I am also doing the same type of analysis. I also not geting proper results with schottky diodes with standard specifications. We can solve only with proper schottky diodes(means well modeled) Bye Madhav |
Title: Re: input impedance of voltage multiplier Post by gmadhavareddy on Sep 13th, 2006, 5:36am Hi Srinivasan, I am also doing thesis on same project. I want to discuss with you some other things realted to input impedance. Could u give your contact?( mail id or phone no) Regards, Madhav |
Title: Re: input impedance of voltage multiplier Post by gmadhavareddy on Sep 13th, 2006, 9:40am Hi, I dont know exactly wich simulator u r using. I asked my supervisor may be it will help u. U have to do large signal transient analysis for calculating input impedance. Zin(1harmonic)= Vin(1st harmonic)/Iin(1 st harmonic). I want to know wether u r using schottky diodes for votage multiplier or it is sufficient for Ordinary MOS transistor? Regards, Madhav |
Title: Re: input impedance of voltage multiplier Post by Ken Kundert on Sep 13th, 2006, 10:23am If you use Spectre, you can use its "Fourier Analyzer" to do this calculation for you. Use "spectre -h fourier" and specify both sets of inputs. -Ken |
Title: Re: input impedance of voltage multiplier Post by sriniv1422 on Sep 14th, 2006, 2:19pm ken thank you. i will try this out. srinivasan |
The Designer's Guide Community Forum » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved. |