Because high-speed data take up wide bandwidth, looking for one which have high efficiency modulation scheme and suitable for frequency hopping communication system is needed.

When supply modulation and contour modulation are working in concert, the dynamic range and efficiency of the power amplifier can be further improved.

Contour modulation is a technique in which a phase-modulated signal waveform and amplifier output impedance work together to maintain higher efficiency over a sizable output power back-off.