A Radio forum. RadioBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » RadioBanter forum » rec.radio.amateur » Homebrew
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Varicap (Varactor) Paralleling Madness

Thread Tools Display Modes
Old January 27th 17, 04:24 AM
Charlie_V Charlie_V is offline
Junior Member
First recorded activity by RadioBanter: Jan 2017
Posts: 1
Default Varicap (Varactor) Paralleling Madness

Hi everyone,

I'm working on an experiment where I want to investigate the nonlinear effects of a varicap (varactor). The problem is that I need the capacitance to be very large.... very very large.

I found a suitable varicap (BB640), having a capacitance ratio of about 25 times with a maximum capacitance of 30pF. For my experiment I need a maximum capacitance of ~100nF. My insane question is do you think it would be possible to parallel 4000 of these devices together and obtain a 100nF version of this particular device, with the same cap ratio change (25 for this particular model)?

These diodes will never be forward biased, but will only ever be reversed biased (so I don't think there will be any heating issues). I'm not really sure what to expect; if the total capacitance ratio will remain after 4000 parallels or if something else happens. I had hopes of trying to change the capacitance at a 1MHz rate (maximum), I'm not sure what the speed a single varicap can change at but I assume that 4000 will probably change a bit slower. I've spent many hours looking to see if anyone has done anything this extreme and the most I found was on this forum where someone discussed putting 2 in parallel.

Any insights would be most appreciated.

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Paralleling Transmission Lines Cecil Moore Antenna 7 April 23rd 10 02:40 PM
Paralleling computer power supplies Dale Parfitt[_3_] Homebrew 10 January 6th 09 08:46 AM
Varactor dipper lw1ecp Homebrew 2 May 31st 07 04:47 AM
Need data for Siemens varicap diode BB113 Joe McElvenney Homebrew 0 August 4th 04 10:20 AM
Paralleling Astron Supplies Murray neece Swap 5 April 18th 04 10:24 PM

All times are GMT +1. The time now is 04:03 PM.

Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2004-2017 RadioBanter.
The comments are property of their posters.