A division ratio - variable delay method for VCO FM nonlinearity correction

FM nonlinearity is the main obstacle to improve the performance of a good many VCO applications. Aiming at problems such as nonlinearity influence of delay line, low SNR and so on in the existing nonlinearity correction methods, a universal correction model is proposed and based on the model the sources of dominant error in the correction process are analyzed. To decrease errors produced in the carrier frequency-transfer segment, a division ratio- variable delay method of high performance, low cost is brought up based on ideas from some other correction structures. The structure has an innovative feature, frequency-shift relativity, which can solve the contradiction between delay time and sampling frequency. Simulation proves that the new structure and feature has excellent noiseproof performance and deserves further research.