Transmission circuit and communication apparatus comprising...

Details Transmission circuit and communication apparatus comprising... Transmission circuit and communication apparatus comprising...

2007-01-16

2009-11-10

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

Reexamination Certificate

active

07616702

ABSTRACT:
A transmission circuit is provided which can quickly and accurately control an output power of a transmission signal even when the transmission signal is output at a high modulation rate and in a wide dynamic range. A switching control section controls a modulation method changing section to change a modulation method of a modulated signal generating section to a modulation method having a narrow dynamic range before controlling a switching section to switch amplification sections. An output adjustment control section controls output adjusting sections so that a difference in level between a transmission signal which is smoothed by a smoothing circuit and is before the amplification sections are switched, and a transmission signal which is after the amplification sections are switched, is caused to be smaller than a predetermined difference threshold value, when the modulated signal generating section operates in the modulation method having the narrow dynamic range.

REFERENCES:
patent: 7248626 (2007-07-01), Bremer
patent: 7324787 (2008-01-01), Kurakami et al.
patent: 2004/0013183 (2004-01-01), Bremer
patent: 2005/0281353 (2005-12-01), Huang et al.
patent: 2006/0285582 (2006-12-01), Sumasu et al.
patent: 03-154430 (1991-07-01), None
patent: 06-284022 (1994-10-01), None
patent: 3069880 (2000-05-01), None
patent: 2005/048627 (2005-05-01), None

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