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Injection locking characteristics of oscillators are studied both qualitatively and analytically and the closed-form expressions of frequency-pulling and spectrum of the unlocked driven oscillator is estimated with negligible amplitude perturbation. Modifications in spectrum, lock range, and pulling of the oscillator are shown under significant amplitude perturbation. Also an approximate expression of amplitude perturbation is presented. Numerical simulations and experimental results describing the oscillator's pulling process under significant amplitude perturbation are given.