H - Electricity – 03 – D
Patent
H - Electricity
03
D
321/7, 328/8
H03D 7/16 (2006.01) H03L 7/06 (2006.01) H04L 27/22 (2006.01) H04L 27/18 (2006.01)
Patent
CA 1233887
- 19 - Abstract of the Disclosure A frequency converting circuit converts an input frequency into a desired frequency. To obtain the desired frequency, a first frequency converter converts the input frequency, by using an output frequency of a first local oscillator, into an intermediate frequency. The first local oscillator is a voltage controlled oscillator as a part of a phase locked loop circuit. A second frequency converter converts the intermediate frequency into the desired frequency by using an output frequency of a second local oscillator. A phase comparing circuit compares the phase of the output signal of the second frequency converter with that of the output signal of the first local oscillator. The phase comparing circuit is contained in the phase locked loop circuit. The result of the comparison is used for controlling the oscillating frequency of the first local oscillator.
486354
Kabushiki Kaisha Toshiba
Ridout & Maybee Llp
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