PLL circuit, radio terminal device and control method of PLL...

Details PLL circuit, radio terminal device and control method of PLL... PLL circuit, radio terminal device and control method of PLL...

2011-05-24

2011-05-24

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S147000

Reexamination Certificate

active

07948285

ABSTRACT:
There is provided a PLL circuit including a phase comparison unit that compares an accumulated addition value of a division ratio converted into a digital value and that of an oscillating signal from an oscillator controlled by using the digital value in each cycle of a reference frequency, a data conversion unit that has a variable gain amplification unit to change a gain and causes output of the phase comparison unit to converge to an arbitrary setting value, an offset detection unit that detects an offset arising due to a change in gain of the variable gain amplification unit using output of the phase comparison unit, and an offset compensation unit that compensates for the offset detected by the offset detection unit in timing when the gain of the variable gain amplification unit changes.

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Robert Bogdan Staszewski, et al., “All-Digital Phase-Domain TX Frequency Synthesizer for Bluetooth Radios in 0.13μm CMOS”, ISSCC, International Solid State Circuits Conference, 2004, 10 pages.

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