Phase modulation apparatus and wireless communication apparatus

Details Phase modulation apparatus and wireless communication apparatus Phase modulation apparatus and wireless communication apparatus

2006-11-09

2010-11-02

Maung, Nay A (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

C455S206000, C455S216000, C455S276100

Reexamination Certificate

active

07826811

ABSTRACT:
A two-point modulation type phase apparatus and a wireless communication apparatus capable of achieving a reduction in circuit scale and low power consumption while maintaining modulation precision. It is possible to provide a D/A converter (150) that converts the inputted digital baseband signal to an analog signal, an adder (110) that adds an output signal of a D/A converter (150) and an output of a loop filter (135) to output to a control voltage terminal of the voltage controlled oscillator (105), and a peak control section (140) provided at a front stage of the D/A converter (150) that carries out smoothing of peak portions appearing at the inputted digital baseband signal, at a two-point modulation type phase modulation apparatus (100) that modulates a-carrier frequency signal using an inputted digital baseband signal by setting a frequency dividing ratio of a frequency divider (115) of a PLL circuit based on an inputted digital baseband modulation signal, and adding a voltage corresponding to a signal that is an inputted digital baseband signal analog-converted for supply to a control voltage terminal of a voltage controlled oscillator (105).

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International Search Report dated Dec. 12, 2006 with English translation.

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