Patent ID: 7856212
Filing Date: 2010-12-21
Classification: H03L

Abstract:
1. A millimeter-wave phase-locked loop (PLL) comprising: an injection-locked frequency divider (ILFD) to generate a divided output frequency from an injected millimeter-wave frequency; calibration circuitry to determine values for an ILFD control signal to be applied to the ILFD for a selected oscillating frequency band to cause the ILFD to operate at or near a center of a locking range of the ILFD; and a voltage controlled oscillator (VCO) to generate the injected millimeter-wave frequency as an output frequency of the PLL based at least in part on the divided output frequency generated by the ILFD, wherein the ILFD comprises: a pseudo-differential pair of transistors; a quarter-wavelength transmission line coupled between the pseudo-differential pair and ground to receive the injected millimeter-wave frequency; and a pair of transistors operating as voltage controlled resistors responsive to the ILFD control signal.