Modulators – Frequency modulator – Including stabilization or alternatively distortion – noise...
Reexamination Certificate
2007-05-08
2007-05-08
Kinkead, Arnold (Department: 2817)
Modulators
Frequency modulator
Including stabilization or alternatively distortion, noise...
C332S127000, C331S034000, C331S016000
Reexamination Certificate
active
11078703
ABSTRACT:
A phase modulation apparatus is provided whereby excellent RF phase modulation signals can be obtained even when the modulation sensitivity of a voltage controlled oscillator varies. Phase modulation apparatus100has: phase detector105that performs phase detection with respect to an RF phase modulation signal outputted from VCO101; comparator106that compares the phase of the detected signal with the phase of a baseband phase modulation signal and outputs the difference between the signals; variable gain amplifier107that controls the gain of the baseband phase modulation signal based on the output of comparator106and supplies the gain-controlled baseband phase modulation signal to VCO101. By this means, the signal level of the baseband phase modulation signal that is supplied to VCO101can be controlled in accordance with the modulation sensitivity of VCO101, so that phase modulation apparatus100can be realized whereby excellent RF phase modulation signals even when the modulation sensitivity of VCO101varies.
REFERENCES:
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patent: 5952895 (1999-09-01), McCune, Jr. et al.
patent: 6211747 (2001-04-01), Trichet et al.
patent: 6809585 (2004-10-01), Chadwick
Adachi Hisashi
Hirano Shunsuke
Kinkead Arnold
Stevens Davis Miller & Mosher LLP
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