Two-point modulation type phase modulation apparatus, polar...

Details Two-point modulation type phase modulation apparatus, polar... Two-point modulation type phase modulation apparatus, polar...

2008-05-27

2008-05-27

Mis, David (Department: 2817)

Modulators

Phase modulator

C332S145000, C331S016000, C331S017000, C331S018000, C331S023000, C455S110000, C455S112000, C455S113000

Reexamination Certificate

active

07378918

ABSTRACT:
There provides a two-point modulation phase modulation apparatus capable of obtaining an RF phase modulation signal of superior modulation precision with low power consumption and a simple configuration even in the event of inputting a wide band baseband modulation signal. A differentiator (21) of the opposite characteristics to the attenuation characteristics of anti-alias filter (22) is provided at the front stage of a D/A converter (6). As a result, it is possible to sufficiently suppress an alias signal without raising the sampling frequency of the D/A converter (6) (i.e. low power consumption) using an anti-alias filter (22) of a simple configuration (i.e. low cost) with a low order for a narrower bandwidth than a PLL modulation frequency bandwidth, and it is possible to obtain an RF phase modulation signal where the entire frequency band of input digital baseband modulation signal (S1) is reflected in a superior manner.

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