Does LO input on AD8345 drive the RF frequency of the output?

I know this may sound like an elementary question, but I am trying to modulate a 2kHz signal at 150MHz.  If I supply the LO input with a 150MHz input, will the AD8345 give a modulated signal at the 150MHz?  I want to assume so, but at the same time you know what they say when you assume.

Thanks in advance!

Derek

Parents
  • 0
    •  Analog Employees 
    on Apr 17, 2014 8:21 AM over 6 years ago

    Hello

    There are two mixer cores in Modulator, AD8345. The quadrature inputs(I and Q) are mixed with LO and then they are combined. It results in single sideband at RFout.  Let's assume the quadrature baseband inputs are 2KHz and LO is150MHz. At this case, a modulated signal is at either 150MHz + 2KHz or 150MHz - 2KHz according to phase relationship between I and Q, or 90degree phase splitter. There would be also LO leakage and unwanted sideband at RFoutput from imperfection in real modulator.

    Tony

Reply
  • 0
    •  Analog Employees 
    on Apr 17, 2014 8:21 AM over 6 years ago

    Hello

    There are two mixer cores in Modulator, AD8345. The quadrature inputs(I and Q) are mixed with LO and then they are combined. It results in single sideband at RFout.  Let's assume the quadrature baseband inputs are 2KHz and LO is150MHz. At this case, a modulated signal is at either 150MHz + 2KHz or 150MHz - 2KHz according to phase relationship between I and Q, or 90degree phase splitter. There would be also LO leakage and unwanted sideband at RFoutput from imperfection in real modulator.

    Tony

Children
No Data