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US 6,662,002 B2Granted
Frequency conversion circuit and transmitter
AssigneeHitachi Kokusai Electric Inc.
InventorsMitsuo Kubo, Masashi Naito
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AssigneeHitachi Kokusai Electric Inc.
InventorsMitsuo Kubo, Masashi Naito
Estimating the term…
A frequency conversion circuit for changing a frequency of an input signal to obtain an output signal, includes: a sum holding unit holding a sum; an integrating unit updating the sum by changing the sum by a natural number a in one direction at each input of a first predetermined signal based on the input signal; and an output signal generating unit outputting a second predetermined signal as the output signal at each time at which the sum has gone over (b*N+c), where N is an integer, c is a constant integer and b is a natural number equal to or larger than a.
A frequency conversion circuit for changing a frequency of an input signal to obtain an output signal, comprising:
A transmitter for use in radio communication, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Transmitters: circuits
Circuits: with frequency synthesizers, frequency converters or modulators
Transmission
Term ended 7 May 2022 (estimated)
1. Field of the Invention
The present invention relates to a frequency conversion circuit and a transmitter. More particularly, the present invention relates to a frequency conversion circuit that changes a frequency of an input signal in accordance with a changing ratio set in advance, and a transmitter using such a frequency conversion circuit.
2. Description of the Related Art
FIG. 1 shows a structure of a frequency conversion circuit according to a first embodiment of the present invention.
FIG. 2 is a time chart showing an operation principle of the frequency conversion circuit according to the first embodiment of the present invention.
FIG. 3 shows an operation flow of the frequency conversion circuit according to the first embodiment of the present invention.
The invention will now be described based on the preferred embodiments, which do not intend to limit the scope of the present invention, but exemplify the invention. All of the features and the combinations thereof described in the embodiment are not necessarily essential to the invention.
(Embodiment 1) FIG. 1 schematically shows a structure of a frequency conversion circuit according to the first embodiment of the present invention.
The frequency conversion circuit of the present embodiment obtains a frequency that equals to a/b times a frequency of an input signal α and outputs a signal having the thus obtained frequency as an output signal β, where a and bare natural numbers (i.e., 1, 2, . . . ) satisfying a≦b.