Visit RFCafe.com Thanks for visiting RFCafe.net Thanks for visiting the RF Cafe Archives Thank you for visiting RF Cafe Thank you for visiting the RF Cafe Archives!

Multiplying two signals with opposite phases. - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues - primarily having to spend time purging garbage posts from the board. At some point I might start the RF Cafe Forums again if the phpBB software gets better at filtering spam.

Below are the old forum threads, including responses to the original posts.

-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews
-- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

nevershadow
 Post subject: Multiplying two signals with opposite phases.
Posted: Wed Jul 18, 2012 5:31 am 
 
Lieutenant

Joined: Wed Jul 18, 2012 5:13 am
Posts: 1
Hi, im new to this forum and i am not sure i am posting this question in the right place but here it goes.
If i have two baseband signals- u1(t) = A1(t)cos(wt+p(t)) and u2(t) = A2(t)cos(wt-p(t)),
where A1 and A2 are the amplitude changes in time in its band(which is 100 MHz for example) and p(t) is the phase changes in time in their band.
both signals reside in frequency - w. so they basicly overlap if put together.
now we multiply the first on the second and filter out the low frequencies - so basicly we receive
A1(t)*A2(t)cos(2wt).

my question is this- if i mentally divide u1 by half (take the first 50 MHz of the band) and u2 by half and then multiply all 4 halfs between themselves (and take hgher frequencies) will i receive the initial output - A1(t)*A2(t)cos(2wt)?

Thanks in advance.




Posted  11/12/2012
RF Stencils for Visio v3.1 by RF Cafe
RF Cascade Workbook 2018 (GS) - RF Cafe
About RF Cafe Archives
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:  AirplanesAndRockets.com

spacer