Broadband modulation PLL, and modulation factor adjustment...

Details Broadband modulation PLL, and modulation factor adjustment... Broadband modulation PLL, and modulation factor adjustment...

2007-06-26

2007-06-26

Kinkead, Arnold (Department: 2817)

Oscillators

Amplitude control or stabilization

Automatic

C331S182000, C331S175000, C331S17700V, C332S127000, C332S128000

Reexamination Certificate

active

10539426

ABSTRACT:
A problem of the present invention is to provide a wide band modulation PLL having good modulation accuracy at low cost. With respect to a PLL having a VCO (21), a frequency divider (22), a phase comparator (23), a charge pump (24) and a loop filter (25), the VCO (21) and a frequency dividing ratio of the frequency divider (22) are controlled to perform modulation. The VCO (21) has two control terminals for PLL and modulation, and a control signal generation part (28) generates a control voltage Vtmof the VCO (21) based on phase modulation data and an input voltage Vtlto the control terminal for PLL. At the time of adjusting a modulation factor, the control voltage Vtmto the control terminal for modulation of the VCO (21) is controlled and also the input voltage Vtlis measured and a modulation sensitivity of a frequency of the VCO (21) to Vtmis calculated and a modulation factor of the phase modulation data is adjusted based on the modulation sensitivity obtained.

REFERENCES:
patent: 6211747 (2001-04-01), Trichet et al.
patent: 2003/0052744 (2003-03-01), Suto
patent: 1-171114 (1989-12-01), None
patent: 11-68719 (1999-03-01), None
patent: 2003-92513 (2003-03-01), None

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