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

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2 Author(s)
Chih-Wei Yao ; Electr. Eng. Dept., Univ. of California, Los Angeles, Los Angeles, CA, USA ; Willson, A.N.

A 2.8-3.2-GHz fractional-N digital PLL, implemented in 0.18- μm 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 mm2 .

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:48 ,  Issue: 3 )

Date of Publication:

March 2013

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