Wiktionary
phase modulator
n. an electronic circuit that causes the phase angle of a modulated wave to vary in accordance with the modulating signal
Usage examples of "phase modulator".
The cadet squatted beside the stasis table, fitting her phase modulator over the controls.
We're not going to achieve much more until the phase modulator amplifiers arrive.
With the capacitor now in place, she could concentrate on the phase modulator.