A 2.8-3.2-GHz Fractional-N Digital PLL With ADC-Assisted TDC and Inductively Coupled Fine-Tuning DCO

作者：Yao Chih Wei^*; Willson Alan N Jr

来源：IEEE Journal of Solid-State Circuits, 2013, 48(3): 698-710.

DOI：10.1109/JSSC.2012.2230543

• ADPLL
• digitally controlled oscillator (DCO)
• digital PLL
• fractional-N PLL
• frequency synthesizer
• gated-ring oscillator
• PLL
• time-to-digital converter (TDC)

A 2.8-3.2-GHz fractional-N digital PLL, implemented in 0.18-mu m CMOS, is presented. The PLL architecture has the form of a classic delta-sigma fractional-N PLL. A PFD generates up and down pulses from the reference and divided-down digitally controlled oscillator (DCO) clock. The time-to-digital converter (TDC) converts the width of up pulses to digital words. The quantization noise introduced by a third-order delta-sigma modulator through the multi-modulus divider is canceled at the TDC output. A resistively interpolated ADC is employed to boost TDC resolution by a factor of five. A dither-less DCO with an inductively coupled fine-tuned varactor bank improves tuning step-size by a factor of 16.6, to 20 kHz. With a 52-MHz reference clock, a 3.2-GHz output clock, and a loop-bandwidth of 950 kHz, this prototype achieves 230-fs rms jitter, integrated from a 1-kHz to 40-MHz offset, while drawing 17 mW from a 1.8-V supply. The in-band phase noise floor is -111.6 dBc/Hz at a 500-kHz offset. The reference spur is -75 dBc and the worst-case fractional-N spur, by sweeping the multiplication ratio near 61, is -55 dBc. An FOM of -240.4 dB is achieved, and this design occupies a core area of 0.62 mm(2).

• 出版日期2013-3