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A 4.75GHz fractional frequency divider with digital spur calibration in 45nm CMOS

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3 Author(s)
Pellerano, S. ; Intel, Hillsboro, OR ; Madoglio, P. ; Palaskas, Y.

Local-oscillator (LO) pulling is a typical issue in fully integrated transceivers. To offset the oscillator frequency from the PA output frequency, SSB mixing or division-by-2 is typically used. However, the first might require additional filtering to remove mixing spurs and the latter is still sensitive to second-harmonic pulling. The divider described in this paper prevents LO pulling by introducing a fractional ratio between input and output frequencies. Since fractional spurs are suppressed by digital calibration, no additional filtering is required, removing inductors and saving silicon area.

Published in:

Solid-State Circuits Conference - Digest of Technical Papers, 2009. ISSCC 2009. IEEE International

Date of Conference:

8-12 Feb. 2009