Frequency modulation circuit

Details Frequency modulation circuit Frequency modulation circuit

2008-01-04

2010-06-15

Mis, David (Department: 2817)

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

C332S127000, C331S017000, C331S023000, C455S255000, C455S260000

Reexamination Certificate

active

07737800

ABSTRACT:
Provided is a frequency modulation circuit1for outputting a highly precise frequency-modulated signal regardless of variation in a characteristic of a VCO15. A correction value calculation section17calculates a correction value Vt2based on a voltage value (Vtx−Vt1) resulting from subtracting a control voltage Vt1, which is generated by a control voltage generation section11, from a control voltage Vtx at which a sensitivity of the VCO15is maximized. A variable amplifier18amplifies the correction value Vt2. An addition section13outputs a control voltage Vt3, which results from adding the amplified correction value Vt2to the control voltage Vt1, to the VCO15via a DAC14.

REFERENCES:
patent: 2009/0289723 (2009-11-01), Maeda et al.
patent: 2-162407 (1990-06-01), None

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