PLL circuit, radio-communication equipment and method of...

Details PLL circuit, radio-communication equipment and method of... PLL circuit, radio-communication equipment and method of...

2007-11-27

2007-11-27

Pascal, Robert (Department: 2817)

Oscillators

With frequency adjusting means

Step-frequency change

C331S016000, C331S014000, C331S011000, C331S010000

Reexamination Certificate

active

11100896

ABSTRACT:
A Phase-Locked Loop (PPL) circuit includes a voltage controlled oscillator (VCO), a reference signal oscillator, first and second frequency dividers, a phase comparator, a charge pump and a loop filter. The VCO has a plural number of oscillation frequency boards and oscillates according to a control voltage in a selected band. The first frequency divider frequency divides the output signal of the VCO. The second frequency divider frequency divides the reference signal outputted from the reference signal oscillator. The phase comparator detects the phase difference between the output signal of the first and second frequency dividers and outputs a phase difference signal. The charge pump inputs and outputs a current generated by a gain that was set depending on the selected band based on the phase difference signal. The loop filter increases or decreases the voltage with a specified low pass filter.

REFERENCES:
patent: 6147567 (2000-11-01), Welland et al.
patent: 6552618 (2003-04-01), Nelson et al.
patent: 6563387 (2003-05-01), Hirano et al.
patent: 6747519 (2004-06-01), Jaehne et al.
patent: 6838947 (2005-01-01), Gomez
patent: 6888413 (2005-05-01), Adams et al.
patent: 2005/0237119 (2005-10-01), Irie
patent: 10-154934 (1998-06-01), None
patent: 2003-152535 (2003-05-01), None

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