Electronic apparatus having radio transmitter
AssigneeFujitsu Limited
InventorsNobuhide Maruo, Makoto Saotome, Makoto Kotani
Life of this patent
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Abstract
An electronic apparatus comprising a radio transmitter is disclosed. In a computer system (1) having a radio transmission circuit (3) of a phase modulation type supplied with power from a power supply (4) of a switching type, the switching frequency of the power supply (4) is determined based on the comparison frequency for the sampling operation of a PLL circuit (10) of the radio transmitter, thereby removing the power noises generated from the switching regulator of the radio transmitter of a phase modulation type.
Claims11
An electronic apparatus comprising a radio transmitter of a phase modulation type supplied with power from a switchable power supply,
- wherein the switching frequency of said power supply is based on the frequency of said radio transmitter.
A PLL circuit, for producing a plurality of reference frequencies, comprising:
- an output line supplying a first reference frequency to a modulation circuit;
- and
- an output line supplying a second reference frequency to a switching regulator.
Dependencies are inferred from the claim text.