ring modulator

[RMmod]

Hello all,

I need help designing a ring modulator for AM(DSB) instead of DSB-SC..ANY help would be greatly appreciated!!

ROMI

[Howardlong]

I apologise in advance if I am wrong, but if this is a homework question could you please give the entire question, because I don't quite understand what's being requested. If it's a real life question, please expand on the detail as to what you're trying to achieve.

[RMmod]

THanks Howardlong!!

This is indeed a homework question and I really need to get this done on Multisim..Than I can demonstrate on breadboard though.

Ring modulators are used for DSB-SC generation as common practice but we are required to transmit AM (DSB) through modified ring modulator !!

Thanks again

[T3sl4co1l]

Ooh, LaTeX.  A professor who cares.  

AM is done with a single or dual quadrant mixer, not a four quadrant mixer.  If you must use a ring modulator, you can add carrier back in... which seems pointless.  The whole reason to choose a DBM is because it affords some carrier rejection.

Preferably, you'd use a single balanced mixer (two diodes, or even better, a long tailed pair like this: http://www.classiccmp.org/rtellason/chipdata/ca3028.pdf ).

Tim

[RMmod]

can you draw it  please TIM

[T3sl4co1l]

Afraid that'd be doing your homework for you...

Read the textbook and note the difference between AM and DSB-SC.  Then read about adding voltages, or superposition, etc.

Tim

[RMmod]

I understand your concern....

I have built something on Multisim but couldn't really move forward.....Please take a look at it..attached file for review

Thanks again.