Communication apparatus

Details Communication apparatus Communication apparatus

2008-12-17

2010-10-12

Pascal, Robert (Department: 2817)

Modulators

Phase modulator

Including amplitude modulator

C332S146000, C332S152000, C341S143000, C455S102000, C455S110000

Reexamination Certificate

active

07812684

ABSTRACT:
A communication apparatus has a local oscillator which performs phase modulation based on a phase component of a baseband signal and outputs a phase modulated signal, a controlling circuit which is supplied with an integer portion included in an amplitude component of the baseband signal and generates and outputs a controlling signal based on a size of the integer portion, a subtractor which is supplied with the integer portion and the controlling signal, subtracts a value of the controlling signal from the integer portion, and outputs a result, a MASH (Multi-stAge-noise-Shaping) circuit which is a second-order delta-sigma modulation means supplied with a fractional portion of the amplitude component, an order of the MASH circuit being switchable between a first order and a second order based on the controlling signal, and an amplifier which sets a voltage value based on an output of the MASH circuit and an output of the subtractor, multiplies the voltage value and the phase modulated signal, and outputs a result.

REFERENCES:
patent: 7280056 (2007-10-01), Puma
patent: 2005/0202790 (2005-09-01), Matsuura et al.
patent: 2008/0042886 (2008-02-01), Li Puma
Robert Bogdan Staszewski, et al., “All-Digital PLL and Transmitter for Mobile Phones”, IEEE Journal of Solid-State Circuits, vol. 40, No. 12, Dec. 2005, 7 pages.

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