Direct-conversion transmitting circuit and integrated...

Telecommunications – Transmitter – Including tuning

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C455S114200, C455S118000

Reexamination Certificate

active

07116950

ABSTRACT:
A transmitter is provided which includes a transmitting circuit that does not require a high-performance low noise VCO restricting cost reduction thereof and that can reduce the number of parts without requiring an RF filter. A direct conversion that does not require a transmission VCO is applied to the transmitting circuit. In order to achieve noise reduction in a receiving band, low-pass filters are provided a IQ input sections of a modulator that converts IQ signals into RF signals. In comparison with a conventional transmitter using offset PLL, an external VCO required in addition to an RF integrated circuit, a power amplifier, and a front end circuit is reduced. Even in current transistor performance, by using a filter having rapid waveform characteristics such as a SAW more inexpensive than the VCO, or the like, it is possible to provide a GSM/GSM 1800/GSM1900 triple band transmitter.

REFERENCES:
patent: 3501709 (1970-03-01), Uetrecht
patent: 5896421 (1999-04-01), Zamat et al.
patent: 5990738 (1999-11-01), Wright et al.
patent: 6021323 (2000-02-01), Vagher
patent: 6366622 (2002-04-01), Brown et al.
patent: 6600911 (2003-07-01), Morishige et al.
patent: 6721368 (2004-04-01), Younis et al.
patent: 6731923 (2004-05-01), Atkinson
patent: 2001/0051507 (2001-12-01), Ichihara
patent: 2002/0042256 (2002-04-01), Baldwin et al.
patent: 2002/0137487 (2002-09-01), Yochem
patent: 0 274 784 (1988-07-01), None
patent: 0 865 165 (1998-09-01), None
patent: 1 102 413 (2001-05-01), None
patent: 2 365 638 (2002-02-01), None
“RF Circuits Technique of Dual-band Transceiver IC for GSM and DCS1800 application”, Takikawa, et al.; IEEE 25thEuropean Solid-State Circuits Conference; pp. 278-281; 1999.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Direct-conversion transmitting circuit and integrated... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Direct-conversion transmitting circuit and integrated..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct-conversion transmitting circuit and integrated... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3633003

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.