摘要： 这种电路同步同时保持低 THD，振幅的正弦波输出，通过三个几十年的频率 （20 Hz 至 20 kHz）。 Maxim > App Notes > Audio Circuits Signal Generation Circuits Keywords: testing, calibration, pure sinewaves, sinewave generators, low THD, phase-locked loops, PLL, binary frequency dividers, Aug 17, 2010 switched-capacitor lowpass filters, external synchronization APPLICATION NOTE 4504 Locked-Sync Sine Generator Covers Three Decades with Low Distortion Abstract:This circuit synchronizes a sinewave output through three decades of frequency (20Hz to 20kHz) while maintaining low THD and constant amplitude. A similar version of this article appeared in the September 18, 2009 issue of EDN magazine. Analog applications such as testing, calibration, and general system operation often require a sine waveform of accurate amplitude and frequency, with low ……