frequency modulation
4.Frequency modulation offers an effective parameter for spectral evolution: the modulation index (i).
8.Switching Power Supply has three kinds of control circuits: Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM), Pulse Width and Frequency Modulation (PWM-PFM).
10.The research including:1) Design of pipelining 32-bit frequency-phase accumulator with LFM(Linear Frequency Modulation);

