Transmitter and mobile communication terminal using the same

Details Transmitter and mobile communication terminal using the same Transmitter and mobile communication terminal using the same

2006-01-20

2008-10-28

Vuong, Quochien B (Department: 2618)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S126000, C455S552100, C330S099000, C330S291000

Reexamination Certificate

active

07444123

ABSTRACT:
With a dual mode transmitter capable of handling two modulation methods for nonconstant amplitude modulation and constant amplitude modulation, respectively, speed-up of transition between modes is implemented. In a mode handling the constant amplitude modulation, first capacitors included in a low-pass filter constituting an AM loop, and a second capacitor included in an integrator are kept recharged from a first constant-voltage power supply and a second constant-voltage power supply by use of a first switch and a second switch, respectively. By doing so, a value of voltage to be recharged at the time of a mode changeover is decreased, and further, a first variable-gain amplifier starts control of a gain while avoiding a region where the output voltage of the first variable-gain amplifier has slow response against an input voltage.

REFERENCES:
patent: 5467057 (1995-11-01), Joardar
patent: 6057735 (2000-05-01), Cloutier
patent: 6930549 (2005-08-01), Kajiwara et al.
patent: 7062236 (2006-06-01), Midtgaard et al.
patent: 7084704 (2006-08-01), Sowlati
patent: 7209717 (2007-04-01), Okada et al.
patent: 2003/0224740 (2003-12-01), Takano et al.
patent: 2004-007443 (2004-01-01), None
Behzad Razavi, “RF Transmitter Architectures and Circuits”, IEEE 1999 Custom Integrated Circuits Conferences, pp. 197-204.
Tirdad Sowlati, “Quad-Band GSM/GPRS/EDGE Polar Loop Transmitter”, 2004 IEEE International Solid-State Circuits Conference, 10 pages.

Affiliated with

Also associated with

Rating

Transmitter and mobile communication terminal using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transmitter and mobile communication terminal using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmitter and mobile communication terminal using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4011781