Frequency synthesizer using three subfrequency synthesizers for generating two different frequencies
First Claim
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1. A frequency synthesizer comprising:
- first subfrequency generating means for generating a first signal of a first subfrequency, said first subfrequency being capable of varying in units of a predetermined frequency step according to a first subfrequency control signal;
second subfrequency generating means for generating a second signal of a second subfrequency, said second subfrequency being capable of varying in units of a frequency step being N (integer;
N>
=2) times said predetermined frequency step according to a second subfrequency control signal;
third subfrequency generating means for generating a third signal of a third subfrequency, said third subfrequency being capable of varying in units of said predetermined frequency step according to a third subfrequency control signal;
output means for generating two output signals of different frequencies belonging to two different frequency ranges, respectively, by using two combinations selected from the combinations of said first signal, said second signal and said third signal.
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Abstract
A frequency synthesizer includes three subfrequency synthesizers: a first synthesizer generating a first subfrequency varying in units of a frequency step, a second synthesizer generating a second subfrequency varying in units of a frequency step being N times the first frequency step, and a third synthesizer generating a third subfrequency varying in units of the first frequency step. One output signal is obtained by mixing the first subfrequency and the second subfrequency. A second output signal is obtained by mixing the second subfrequency and the third subfrequency.
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8 Claims
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1. A frequency synthesizer comprising:
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first subfrequency generating means for generating a first signal of a first subfrequency, said first subfrequency being capable of varying in units of a predetermined frequency step according to a first subfrequency control signal; second subfrequency generating means for generating a second signal of a second subfrequency, said second subfrequency being capable of varying in units of a frequency step being N (integer;
N>
=2) times said predetermined frequency step according to a second subfrequency control signal;third subfrequency generating means for generating a third signal of a third subfrequency, said third subfrequency being capable of varying in units of said predetermined frequency step according to a third subfrequency control signal; output means for generating two output signals of different frequencies belonging to two different frequency ranges, respectively, by using two combinations selected from the combinations of said first signal, said second signal and said third signal. - View Dependent Claims (2, 3, 4)
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5. A frequency synthesizer comprising:
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first subfrequency generating means for generating a first signal of a first subfrequency, said first subfrequency being capable of varying in units of a predetermined frequency step according to a first subfrequency control signal; second subfrequency generating means for generating a second signal of a second subfrequency, said second subfrequency being capable of varying in units of a frequency step being N times said predetermined frequency step according to a second subfrequency control signal; third subfrequency generating means for generating a third signal of a predetermined subfrequency; first combining means for combining said first signal and said second signal to form a first output signal, a frequency of said first output signal being selected from a plurality of frequencies according to said first and second subfrequency control signals, said plurality of frequencies having said predetermined frequency steps over a first frequency range; and second combining means for combining said first signal, said second signal and said third signal to form a second output signal, a frequency of said second output signal being selected from a plurality of frequencies according to said first and second subfrequency control signals, said plurality of frequencies having said predetermined frequency steps over a second frequency range different from said first frequency range. - View Dependent Claims (6)
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7. A frequency synthesizer comprising:
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first generating means for generating a first output signal of a frequency selected from a plurality of frequencies with a first frequency step in a first frequency range, said first generating means comprising; a) first subfrequency generating means for generating a first signal of a first subfrequency, said first subfrequency being capable of varying in units of said first frequency step according to a first subfrequency control signal; b) second subfrequency generating means for generating a second signal of a second subfrequency, said second subfrequency being capable of varying in units of a second frequency step being N times said first frequency step according to a second subfrequency control signal; and c) first combining means for combining said first and second signals to form said first output signal according to said first and second subfrequency control signals; and second generating means for generating a second output signal of a frequency selected from a plurality of frequencies with said first frequency step in a second frequency range, said second generating means comprising; d) third subfrequency generating means for generating a third signal of a third subfrequency, said third subfrequency being capable of varying in units of said first frequency step according to a third subfrequency control signal; and e) second combining means for combining said second signal and said third signal to form said second output signal according to said second and third subfrequency control signals. - View Dependent Claims (8)
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Specification