Systems and methods for PLL linearity measurement, PLL...

Details Systems and methods for PLL linearity measurement, PLL... Systems and methods for PLL linearity measurement, PLL...

2011-08-09

2011-08-09

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

07994830

ABSTRACT:
Systems and methods for enabling the determination of voltage controlled oscillator (VCO) linearity, duty cycle determination and duty cycle correction in phase locked loop circuits (PLL's.) One embodiment comprises a method including the steps of determining the frequency response of a PLL's VCO as a function of duty cycle, applying a signal based on the VCO output to the VCO input, measuring the resulting frequency of the VCO output signal, determining the duty cycle corresponding to the measured frequency, and configuring a duty cycle correction unit correct the duty cycle of the VCO output signal to about 50%. Determining the frequency response of the VCO may include, for each of several different duty cycle values between 0% and 100%, applying the VCO input signal to the VCO and determining the corresponding frequency of the VCO output signal. This may also be done for duty cycles of 0% and 100%.

REFERENCES:
patent: 7019572 (2006-03-01), Miki
patent: 7103337 (2006-09-01), Uozumi
patent: 7642863 (2010-01-01), Kaneko et al.

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