Telecommunications – Transmitter – Including tuning
Reexamination Certificate
2006-10-03
2006-10-03
Vo, Nguyen T. (Department: 2685)
Telecommunications
Transmitter
Including tuning
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.
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Henshaw Robert Astle
Matsui Hiroaki
Okuma Yasuyuki
Tanabe Masamichi
Tanaka Satoshi
Antonelli, Terry Stout and Kraus, LLP.
Hitachi Device Engineering & Co., Ltd.
Le Nhan T.
Renesas Technology Corp.
TTPCom Limited
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