请帮忙解答下，IQ converter与IQ modulator的区别，谢谢！
The terms are used interchangeably and mean the same thing.
The terms refer to a device that accepts I and Q inputs (analog or digital) that is upconverted by a pair of LO signals 90deg out of phase that are summed at the output. There are many versions of these devices and you can find examples of them here: Mixed-signal and digital signal processing ICs | Analog Devices
They include IQ modulators and quadarature digital upconverters.
An issue about IQ modulator and IQ upconverter | EngineerZone