[hlp] question about quadrature modulator

I think you cannot implement FM/FSK modulation using a quadrature modulator.

An IQ modulator can create AM, FM, PM, and derivates of these.
http://www.educatorscorner.com/index...ONTENT_ID=2478

Any modulation can be expressed mathematically by an I/Q modulation, so any kind of modulation can be implemented by an I/Q modulator.

Hello again;
What's the best Quadrature Modulator in the market?

Hello everyone;
Can't anyone answer the above question?