Matthew,

If you're talking about power gain, 40db is a gain of 10000.  If you're
talking
voltage gain, you're talking about a gain of 100.  This can be calculated by
using the formulas for powewr and voltage as shown below.

Pg (db) = 10log(Po/Pi)

where Pg is power gain
          Po is output power
          Pi is input power
   and log is the logarithim

and for voltage...

Vg(db) = 20log(Vo/Vi)

where  Vg is voltage gain
           Vo is the output voltage
           Vi is the input voltage
    and  log is the logarithim.

Hope this helps you out.

                                    Regards,

                                        Jim



----- Original Message -----
From: Mathew @ Everythingit <mathew@EVERYTHINGIT.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, July 15, 2001 5:47 PM
Subject: [EE]: What is the relationship between gain and dB.


I have read somewhere that 40 dB of gain is approximately 200 times gain.
Does anyone know if this is true and what the formula is to have work out
the relationship.

Thanks in advance

Matt

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads