It has bee traditionally generated by analogue means, generating a double sideband and filtering away the unwanted side, or generating 90 degree phase shifted quadrature signals and mixing them.

Varying the voltage of a carrier or a direct current in order to transmit analog or digital data. Amplitude modulation (AM ... by the analog audio signal.

including phase-noise and signal synthesis using VCOs and phase-locked-loops. You will learn about analog and digital modulation generation and measurement techniques. In Part 3 of RF Fundamentals ...