提出了一种新型数字调谐宽带捷变频振荡器设计方案,实现了优于1μs的捷变频指标。阐述了数字调谐振荡器的基本原理,给出了压控振荡器(VCO)调谐电压非线性的解决方法。着重介绍了影响数字调谐振荡器捷变频的因素及减少捷变频时间的方法。针对运算放大器的建立时间及补偿电容做了重点分析,对不同容值所对应的捷变频时间给出了测试结果与分析。最终设计出数字调谐振荡器的测试频率准确度为±2MHz,相位噪声约-75d Bc/Hz@100k Hz。 A new design scheme of digital tunable broadband agile frequency oscillator is proposed, which achieves agile frequency index better than 1μs. The basic principle of digital tuned oscillator is expounded and the solution to the nonlinearity of voltage controlled oscillator (VCO) tuning voltage is given. The factors that affect the frequency of the digitally tuned oscillator and the method of reducing the frequency of the agile frequency are introduced emphatically. Focusing on the settling time and compensation capacitance of the op amp, the test results and analysis are given for the agile frequency time corresponding to different capacitance values. The final design of digital tuned oscillator test frequency accuracy of ± 2MHz, the phase noise of about-75d Bc / Hz @ 100k Hz.