Patent ID: 8594237

Claim:
A Gaussian Frequency Switch Keying (GFSK) modulator, comprising: a first compensation module, configured to receive a GFSK pulse signal, apply a first amplitude compensation and a first delay compensation to the GFSK pulse signal, so as to generate a first compensated control signal; a second compensation module, configured to receive the GFSK pulse signal, apply a second amplitude compensation and a second delay compensation to the GFSK pulse signal, so as to generate a second compensated control signal; a closed-loop Phase Lock Loop (PLL) module configured to receive and use the first and the second compensated control signals to generate a modulated signal; the GFSK modulator further configured to: determine at least one parameter for the closed-loop PLL module; use the determined at least one parameter to calculate a residual frequency modulation of the GFSK modulation; determine a relationship between the residual frequency modulation of the GFSK modulation and an amplitude mismatch; determine a relationship between the residual frequency modulation of the GFSK modulation and a delay mismatch; determine a residual frequency modulation of the closed-loop PLL module; determine the amplitude mismatch and the delay mismatch according to a residual frequency modulation desired by the GFSK modulator, the residual frequency modulation of the closed-loop PLL module and the determined relationships; and choose a change precision for each of the first amplitude compensation, the second amplitude compensation, the first delay compensation and the second delay compensation.