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Measuring phase, delay errors accurately in I/Q modulators

Posted: 08 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:I/Q modulator? RF signals? phase and delay errors?

A direct I/Q modulator, such as the LT5528, translates baseband I and Q signals to RF, and combines them to produce a modulated single sideband signal with (ideally) minimal residual carrier (LO feedthrough) and image signals (undesired sideband). In an ideal I/Q modulator, with perfect 90 phase shift between the I mixer and Q mixer local oscillators (LOI and LOQ), and with no other undesired phase and gain impairments, the modulator output will contain only the desired sideband.

This Application Note describes a method to accurately measure internal and external phase and timing errors for a high performance direct I/Q modulator.

Please view the PDF document for more information.

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