A technique that enables a SSCG to fine-tune an output signal frequency and a spread ratio is presented. Proposed SSCG achieves the output signal frequency from 1.2GHz to 3.0GHz and the spread ratio from 0 to 30000ppm. The fine-tuning technique achieves 30ppm adjustment of the output signal frequency and 200ppm adjustment of the spread ratio. This technique is achieved by controlling a triangular modulation signal characteristics generated by a proposed digital controlled wave generator. A proposed multi-modulus divider can have a divide ratio of 4/5 and 8/9. This SSCG has been fabricated in a 0.13-µm CMOS process. The output signal frequency-range and the spread ratio are achieved fluently from 0.1 to 3.0GHz and from 0 to 30000ppm, respectively. EMI noise is suppressed at less than 17.1dB at the output signal frequency of 3.0GHz and spread ratio of 30000ppm.