Title: Phase modulating apparatus, communication device, mobile wireless unit, and phase modulating method
Application Number: 200580006357 Application Date: 2005.12.22
Publication Number: 1939024 Publication Date: 2007.03.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04L27/20;H04L27/12;H03C3/00
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name:
Attorney & Agent: bomai wen huangxiao lin
Abstract:
    A multimode-based phase modulating apparatus capable of reducing the degradation of modulation precision and suppressing the unnecessary power consumption. The phase modulating apparatus has a switch (9) for switching the modulation modes of a PLL circuit (15) between a single-point modulation and a double-point modulation. In a case of a narrow modulation bandwidth such as in a GSM mode, the switch (9) is turned off to cease a second digital baseband signal (S2), thereby causing the PLL circuit (15) to perform the single-point modulation in which only a first digital baseband signal (S1) from a frequency division rate generating part (10) is used for the modulation. Contrarily, in a case of a wide modulation bandwidth such as in a UMTS mode, the switch (9) is turned on, thereby performing the double-point modulation using both the first digital baseband signal (S1) and the second digital baseband signal (S2).
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