Wireless transmitter circuit and transceiver using the same

Details Wireless transmitter circuit and transceiver using the same Wireless transmitter circuit and transceiver using the same

2005-06-22

2011-11-08

Urban, Edward (Department: 2618)

Telecommunications

Transmitter

Frequency conversion

C455S119000, C455S114100, C455S553100, C455S063100

Reexamination Certificate

active

08055218

ABSTRACT:
This invention provides a wireless transmitter circuit for mobile communication apparatus and this circuit can be configured with fewer components and is suitable for downsizing. A single PLL synthesizer serves as both RF frequency band PLL and IF frequency band PLL among three oscillators for TX, RX and IF frequency bands, which have been required in conventional mobile communication apparatus. The number of necessary oscillators occupying a large area within a chip is reduced and the number of components is decreased. Specifically, circuitry is arranged to generate local oscillation signals for RF and IF frequency bands by frequency dividing the output of a VCO of the RF frequency band PLL.

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S. Tanaka et al., “GSM/DCS1800 Dual Band Direct-Conversion Transceiver IC with a DC Offset Calibration System,” Proceedings of the 27thEuropean Solid-State Circuits Conference, 2001, pp. 492-495.

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