A method comprising: operating two or more communication modes in a single modulation path of a variable radio frequency, RF, modulator included in a multi-mode wireless communication device, WCD, that supports the two or more communication modes, the single modulation path configured to process differential signals and including in-phase baseband variable filter, quadrature baseband variable filter, in-phase baseband variable gain amplifier quadrature baseband variable gain amplifier, and a first RF mixer for communication modes in a first frequency band and a second RF mixer for communication modes in a second frequency band, the baseband variable filters and the baseband variable gain amplifiers forming a single reconfigurable path for each of the two or more communication modes and each baseband variable gain amplifier driving the one of the first RF mixer and the second RF mixer associated with a selected one of the two or more communication modes; and processing, in the single modulation path, a signal from a user of the multi-mode WCD according to the selected one of the two or more communication modes by setting parameters of variable components along the single modulation path of the variable RF modulator based on the selected one of the communication modes; and wherein processing a signal from a user of the multi-mode WCD comprises: filtering a baseband user signal with the baseband filters based on the parameter setting; amplifying the filtered baseband user signal with the baseband variable gain amplifiers based on the parameter setting to generate an intermediate frequency user signal; applying the intermediate frequency user signal to the RF mixer associated with the frequency band of the selected communication mode; mixing the intermediate frequency user signal and a RF signal from a local oscillator with the RF mixer to generate a RF user signal. operating two or more communication modes in a single modulation path of a variable radio frequency, RF, modulator included in a multi-mode wireless communication device, WCD, that supports the two or more communication modes, the single modulation path configured to process differential signals and including in-phase baseband variable filter, quadrature baseband variable filter, in-phase baseband variable gain amplifier quadrature baseband variable gain amplifier, and a first RF mixer for communication modes in a first frequency band and a second RF mixer for communication modes in a second frequency band, the baseband variable filters and the baseband variable gain amplifiers forming a single reconfigurable path for each of the two or more communication modes and each baseband variable gain amplifier driving the one of the first RF mixer and the second RF mixer associated with a selected one of the two or more communication modes; and processing, in the single modulation path, a signal from a user of the multi-mode WCD according to the selected one of the two or more communication modes by setting parameters of variable components along the single modulation path of the variable RF modulator based on the selected one of the communication modes; and wherein processing a signal from a user of the multi-mode WCD comprises: filtering a baseband user signal with the baseband filters based on the parameter setting; amplifying the filtered baseband user signal with the baseband variable gain amplifiers based on the parameter setting to generate an intermediate frequency user signal; applying the intermediate frequency user signal to the RF mixer associated with the frequency band of the selected communication mode; filtering a baseband user signal with the baseband filters based on the parameter setting; amplifying the filtered baseband user signal with the baseband variable gain amplifiers based on the parameter setting to generate an intermediate frequency user signal; applying the intermediate frequency user signal to the RF mixer associated with the frequency band of the selected communication mode;